JP2006266876A - Positioning system, positioning method, mobile terminal and map server device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire a positioning satellite in a short time by a mobile terminal, for instance, or to improve accuracy in positioning just after movement of the mobile terminal from a closed space to an open space, for instance. <P>SOLUTION: A receiving device 700 receives navigation data from a GPS satellite 500, and transmits orbit information of the navigation data. A wireless LAN access point 600 transmits the orbit information transmitted from the receiving device 700 to a cellphone 300. The cellphone 300 receives the orbit information from the wireless LAN access point 600. When moving from the closed space to the open space, the cellphone 300 receives the navigation data from the GPS satellite 500. The cellphone 300 performs positioning by using the orbit information received from the receiving device 700 and the navigation data received from the GPS satellite 500. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a positioning system, a positioning method, a mobile terminal, and a map server device.

  In a conventional wireless communication system, a tag (also referred to as an RFID (Radio Frequency IDentification), a wireless tag, an electronic tag, or an IC (integrated circuit) tag) and a wireless reader (also referred to as a tag reader) is extended. An energy transmission device that radiates radio waves of a frequency different from the frequency used for communication between the wireless transmitter and the wireless reader is installed, and the tag stores the energy of the radio waves radiated by the energy transmission device. It was used for communication with a wireless reader (see, for example, Patent Document 1).

In the conventional positioning system, in order to enable the position information measuring terminal device to perform positioning even in a closed space where satellite navigation such as GPS (Global Positioning System) cannot be used, a tag for transmitting an ID (identifier) and an ID of the tag A position information conversion device that provides corresponding position information, and the position information measurement terminal device receives the position information corresponding to the ID read from the tag installed in the vicinity from the position information conversion device, and this position Information was used for positioning (for example, refer to Patent Document 2). In another positioning system, a pseudo satellite and a tag for transmitting position information are installed, and the position specifying device uses the position information read from the tag installed in the vicinity for positioning using the pseudo satellite. (For example, refer to Patent Document 3).
JP 2003-124841 A JP 2004-297334 A JP 2004-286494 A

  When moving in a closed space such as an indoor or underground shopping area, use a portable wireless reader to read location information from a tag attached to a feature and check the route. The problem is not. Even if you use the UHF (ultra-high frequency) band, which can easily extend the communication distance, portable wireless readers are legally limited to about 10 mW (milliwatts), so you have to approach a distance of about 50 centimeters. Data cannot be read from the tag. Even in the above-described conventional wireless communication system, there is a problem that the communication distance of the tag located away from the energy transmission device cannot be sufficiently extended. Furthermore, in order for the wireless reader to read data from the tag, it must transmit read radio waves, and when multiple wireless readers transmit read radio waves at random, collisions that affect communication efficiency can be avoided. There was a problem that it was not possible.

  In conventional positioning systems, it takes several minutes to receive satellite orbital information and capture satellites when using GPS after the mobile terminal stays indoors for a long time. It was. In addition, even after the satellite is captured and positioning is started, it takes several minutes until the detailed orbit information is completely received. Therefore, the positioning accuracy is poor for a while, for example, it is recognized through which exit it has moved to the outdoors. There was a problem that it was difficult to do. Further, when positioning using a pseudo satellite, there is a problem that a large cost is required for installing the pseudo satellite.

  An object of the present invention is, for example, for a mobile terminal to acquire a positioning satellite in a shorter time. Another object is to improve the positioning accuracy immediately after the mobile terminal moves from the closed space to the open space.

The positioning system of the present invention is
A receiving device that receives navigation data from a positioning satellite and transmits orbit information included in the received navigation data;
A transmission device for transmitting orbit information transmitted by the receiving device;
A mobile terminal that performs positioning based on navigation data of positioning satellites,
The mobile terminal is
An orbit information receiving unit for receiving orbit information transmitted by the transmission device;
A navigation data receiver for receiving at least part of the navigation data from the positioning satellite;
And a positioning unit that performs positioning based on orbit information received by the orbit information receiving unit and at least part of the navigation data received by the navigation data receiving unit.

  In the present invention, in the mobile terminal, the orbit information receiving unit receives the orbit information included in the navigation data received by the receiving device via the transmission device, and the navigation data receiving unit receives at least navigation data from the positioning satellite. The mobile terminal can be received in a shorter time by receiving a part and performing positioning based on the trajectory information received by the trajectory information receiving unit and at least a part of the navigation data received by the navigation data receiving unit. It becomes possible to capture positioning satellites.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
In the following, this embodiment is described using an example in which a mobile phone user travels outdoors (an example of an open space) after walking around an underground shopping street (an example of a closed space) where a plurality of stores are lined up. explain. The same wireless communication system as in the present embodiment can be implemented in other closed spaces and open spaces. In addition, the same positioning system as that of the present embodiment can be implemented even when moving from another closed space to an open space.

  FIG. 1 is a block diagram showing a configuration of a radio communication system and a positioning system according to the present embodiment.

  The wireless communication system includes a wireless reader / writer 100, a store terminal 150, a tag, and the like. The positioning system includes a wireless LAN (local area network) access point 600, a receiving device 700, and the like, and uses a plurality of GPS satellites 500. The mobile phone 300, the map server device 400, and the network 450 are components of both the wireless communication system and the positioning system. There may be a plurality of each component of the wireless communication system and the positioning system.

  The wireless reader / writer 100 is an example of a radio wave irradiation apparatus, and has both functions of a wireless reader and a wireless writer (also referred to as a tag writer). The wireless reader / writer 100 is used, for example, under the license of a local radio station, and transmits a continuous wave (CW: Continuous Wave) of a high frequency (UHF band unmodulated wave) with a transmission power of 1 W (Watt) class in the surrounding features. Irradiate the tag placed in The continuous wave may be a radio wave irradiated intermittently.

  The store terminal 150 is, for example, a personal computer or a PDA (Personal Digital Assistant), and inputs or holds information related to the store and store location information (hereinafter, this information is referred to as store information). The store terminal 150 transmits store information to the wireless reader / writer 100 through the LAN 650 or the like. The wireless reader / writer 100 writes store information on the tag using a continuous wave applied to the tag. A method by which the wireless reader / writer 100 writes data to the tag will be described later. Here, the store terminal 150 may transmit store information to the wireless LAN access point 600 through the LAN 650 and provide the store information to the mobile phone 300 through the wireless LAN. Further, when the store terminal 150 has a wireless writer function, the store terminal 150 may directly write store information on a tag installed at the entrance of the store. In this case, the wireless reader / writer 100 may be replaced with a wireless reader that cannot write data to the tag, or may be replaced with another type of radio wave irradiation device.

  There are two types of tags, a passive tag 200 and a semi-passive tag 250, both of which are examples of wireless communication devices. Any tag may be replaced with an active tag, or all tags may be unified with either the passive tag 200 or the semi-passive tag 250.

  The passive tag 200 detects a continuous wave irradiated by the wireless reader / writer 100, and an energy source for driving the continuous wave to an electronic circuit such as a memory circuit or a load modulation (ASK (Amplitude Shift Keying) modulation) circuit. The continuous wave is modulated with data in the memory and transmitted. As a result, even a 10 mW class low-power mobile phone 300 can read data from the passive tag 200 several meters away. Furthermore, even if the mobile phone 300 does not emit a read radio wave, data can be read from the tag only by the reception operation. The configuration of the passive tag 200 is shown in FIG.

  The passive tag 200 includes a detection unit 201, a power storage unit 202, a modem unit 203, a control unit 204, a memory (storage unit) 205, and a broadcast unit 206. The detection unit 201 includes an antenna, and receives and detects a continuous wave emitted from the wireless reader / writer 100 from the antenna. The power storage unit 202 includes, for example, a capacitor or a secondary battery, stores the energy of the continuous wave detected by the detection unit 201, and supplies the stored energy to the modem unit 203, the control unit 204, the memory 205, and the like. The modulation / demodulation unit 203 includes a load modulation circuit, demodulates the continuous wave detected by the detection unit 201 to acquire data, and inputs the acquired data to the control unit 204 or continuously with data input from the control unit 204. Or load-modulate the wave. The control unit 204 is, for example, a CPU (Central Processing Unit), controls each unit based on the content of data input from the modem unit 203, writes the data to the memory 205, and stores data stored in the memory 205 And is input to the modem unit 203. The memory 205 stores data such as store information. The broadcast unit 206 broadcasts the data stored in the memory 205 by transmitting the radio wave modulated by the modem unit 203.

  The semi-passive tag 250 includes a battery as an energy source for driving an electronic circuit such as a memory circuit or a load modulation circuit, and detects a continuous wave irradiated by the wireless reader / writer 100 to turn on the load modulation circuit. The continuous wave is modulated with data in the memory and transmitted. As a result, even a 10 mW class low-power mobile phone 300 can read data from the semi-passive tag 250 several meters away. Furthermore, even if the mobile phone 300 does not emit a read radio wave, data can be read from the tag only by the reception operation. The configuration of the semi-passive tag 250 is shown in FIG.

  The semi-passive tag 250 includes a detection unit 201, a battery (power supply unit) 252, a modem unit 203, a control unit 204, a memory 205, and a broadcast unit 206. The detection unit 201, the modem unit 203, the control unit 204, the memory 205, and the broadcast unit 206 are the same as those of the passive tag 200. The battery 252 is, for example, a primary battery, and supplies energy to the modem unit 203, the control unit 204, the memory 205, and the like. Here, the semi-passive tag 250 may have the same power storage unit 202 as the passive tag 200, and both the energy stored in the power storage unit 202 and the energy stored in the battery 252 in advance may be used.

  Since the semi-passive tag 250 does not have an oscillator or the like unlike the active tag, the power consumption is small, the battery 252 has a life of about several years, and the battery 252 can be used with almost no replacement.

  As described above, the tag according to the present embodiment does not require a radio wave read from the mobile phone 300 as in the prior art, and performs communication using a continuous wave emitted by the wireless reader / writer 100. For this reason, the mobile phone 300 can read data from the tag only by the receiving operation without issuing a read radio wave. As a result, it is possible to avoid a collision that often occurs when a plurality of mobile phones 300 randomly read out radio waves. For example, when the location information is notified by tags in a shopping district where many users gather, Service can be provided. Further, for example, by simply sticking a tag at the entrance of a store or the like as a nameplate, the user of the mobile phone 300 can record and check his / her walking history, and can provide position information more easily understood by humans.

  The GPS satellite 500 is an example of a positioning satellite, and transmits navigation data including orbit information. The orbit information includes, for example, almanac data and ephemeris data. The almanac data is information common to each GPS satellite 500 and is updated every week. Almanac data also includes parameters of the rough ionosphere correction model. The ephemeris data is a detailed orbit parameter unique to each GPS satellite 500 and is updated about every two hours. The ephemeris data also includes satellite clock correction information. Here, the GPS satellite 500 may be another type of positioning satellite such as a quasi-zenith satellite.

  The receiving device 700 has a GPS antenna, receives navigation data from the GPS satellite 500, and transmits orbit information included in the received navigation data to the wireless LAN access point 600 or the map server device 400 via the network 450. . The receiving device 700 may transmit only the ephemeris data or a part of the ephemeris data as the orbit information.

  The receiving device 700 may be installed near the closed space, but from at least one (preferably four) GPS satellites 500 that can be captured immediately after the mobile phone 300 moves from the closed space to the open space. It only has to be installed at a position where navigation data can be received.

  The wireless LAN access point 600 is an example of a transmission device, and transmits the trajectory information transmitted by the receiving device 700 to the mobile phone 300 via the wireless LAN. When the receiving device 700 transmits the trajectory information to the map server device 400, the trajectory information is received from the map server device 400 and transmitted to the mobile phone 300. Here, the wireless LAN access point 600 can be replaced with a wireless base station device of a mobile communication network that the mobile phone 300 uses for normal telephone and data communication. In this case, the mobile phone 300 receives the trajectory information not via the wireless LAN but via the mobile communication network.

  The mobile phone 300 is an example of a mobile terminal. The mobile phone 300 can be replaced with another communication device such as a PDA or a notebook computer. The configuration of the mobile phone 300 is shown in FIG.

  The mobile phone 300 includes a position information receiving unit 301, a map information receiving unit 302, a control unit 303, an output unit 304, a trajectory information receiving unit 305, a navigation data receiving unit 306, and a positioning unit 307.

  The position information receiving unit 301 has a function of a wireless reader, for example, and receives position information broadcast by the tag. The location information receiving unit 301 may receive data other than location information, such as information about a store, from a tag. The map information receiving unit 302 has a wireless LAN communication function, for example, and receives map information from the map server device 400 via the wireless LAN access point 600. The orbit information receiving unit 305 receives the orbit information of the GPS satellite 500 from the wireless LAN access point 600. The navigation data receiving unit 306 has a GPS receiver, and receives navigation data from the GPS satellite 500 when the mobile phone 300 is in an open space.

  The positioning unit 307 performs positioning by complementing the navigation data received by the navigation data receiving unit 306 with the track information received by the track information receiving unit 305 immediately after the mobile phone 300 moves from the closed space to the open space. After a while after the mobile phone 300 moves from the closed space to the open space, the navigation data receiving unit 306 can receive all the navigation data necessary for positioning. After that, the positioning unit 307 performs positioning mainly based on the navigation data received by the navigation data receiving unit 306.

  The control unit 303 is a CPU, for example, and controls each unit. When the wireless communication system is used, the control unit 303 causes the output unit 304 to output a map indicating the current location based on the position information received by the position information receiving unit 301 and the map information received by the map information receiving unit 302. On the other hand, when using the positioning system, the output unit 304 outputs a map indicating the current location based on the result of the positioning performed by the positioning unit 307 and the map information received by the map information receiving unit 302. In addition, the control unit 303 causes the output unit 304 to output information about the store received by the position information receiving unit 301. The output unit 304 is a display device such as a liquid crystal display.

  Thus, when the user of the mobile phone 300 moves from the closed space to the open space, the mobile phone 300 performs positioning using the latest orbit information acquired in advance in the closed space, thereby The acquisition time can be shortened, and the positioning accuracy can be improved even if the navigation data necessary for positioning cannot be completely received.

  In addition, when the mobile phone 300 receives information about a store or map information via a wireless LAN, for example, a user of the mobile phone 300 can obtain a map of the store and information on each store at the entrance of a shopping district. improves.

  The map server device 400 accumulates map information, transmits the map information to the wireless LAN access point 600 through the network 450, and provides the map information to the mobile phone 300 via the wireless LAN. Here, the map server device 400 may be connected to the LAN 650 and transmit map information to the wireless LAN access point 600 through the LAN 650. Further, the map server device 400 itself may have the function of the wireless LAN access point 600.

  When receiving the orbit information of the GPS satellite 500 from the receiving device 700, the map server device 400 transmits the orbit information to the mobile phone 300 via the wireless LAN in the same manner as the map information. The configuration of the map server device 400 in this case is shown in FIG.

  The map server device 400 includes a reception unit 401, a map information database (storage unit) 402, and a transmission unit 403. The receiving unit 401 receives trajectory information included in the navigation data received by the receiving device 700 via the network 450. The map information database 402 stores map information in advance. The transmission unit 403 transmits the trajectory information received by the reception unit 401 and the map information stored in the map information database 402 to the mobile phone 300 via the wireless LAN access point 600 or directly. When the map server device 400 does not receive the orbit information of the GPS satellite 500 from the receiving device 700, the receiving unit 401 is not necessary.

  FIG. 6 is a diagram illustrating an installation example of a wireless reader / writer and a tag in the present embodiment.

  In the example of FIG. 6, stores are lined up on both sides of one passage, and a tag is installed at the entrance of each store. The wireless reader / writer 100 is installed near the middle of the passage, for example, on the ceiling, and irradiates a UHF band continuous wave with a transmission power of about 1 W class. In this case, in the range within about 10 meters from the wireless reader / writer 100, the attenuation of the continuous wave to be irradiated is relatively small. Therefore, the tag installed in this range is the passive tag 200. A semi-passive tag 250 is installed in a range that is approximately 10 meters from the wireless reader / writer 100 and within about 50 meters in which a continuous wave from the wireless reader / writer 100 can be used.

  Thus, by using the semi-passive tag 250 with a built-in battery, the range in which one wireless reader / writer 100 can be used can be expanded, and the number of wireless reader / writers 100 to be installed can be reduced. Therefore, the system configuration can be realized more simply and at a lower cost.

  FIG. 7 is a diagram illustrating an example of command data transmitted on the radio wave emitted by the wireless reader / writer according to the present embodiment. In this figure, for convenience of explanation, the radio wave emitted by the wireless reader / writer 100 is shown as a waveform, the wave when the radio wave is transmitting energy (when the radio wave is unmodulated) is reduced, and the command (command data) ) (When the radio wave is load-modulated), the magnitude of the wave does not necessarily indicate the magnitude of the amplitude.

  As shown in FIG. 7, the wireless reader / writer 100 transmits a command for controlling the tag every time. For example, when data is written to a tag, the wireless reader / writer 100 first creates a command indicating “memory content rewriting permission”, and transmits the command by performing load modulation on the radio wave irradiated by this command. The tag that has received the command enables, for example, a flag indicating “memory content rewrite permission”. Next, the wireless reader / writer 100 transmits the storage data to be written to the tag by the same method. Stored data includes, for example, store information. The tag that has received the stored data writes the stored data into the memory, or updates the stored data stored in the memory to the new stored data that has been received. Next, the wireless reader / writer 100 creates a command indicating “memory content rewriting not permitted” and transmits this command. The tag that has received the command invalidates, for example, a flag indicating “memory content rewriting permission”. In the case where the tag is the passive tag 200, when the wireless reader / writer 100 is not transmitting a command or stored data, the energy of the continuous wave is stored. Here, the passive tag 200 may simultaneously store continuous wave energy while the wireless reader / writer 100 transmits a command or stored data.

  For example, a header indicating that the data is stored in the tag memory is added to the head of the storage data transmitted by the wireless reader / writer 100. In addition, a footer indicating the end is added to the end of the stored data. The stored data may be divided and transmitted.

  In order to increase the reliability of the data broadcast by the tag, the above command or stored data may be encrypted so that only the tag that can decrypt the command can rewrite the contents of the memory.

  FIG. 8 is a flowchart showing an example of the operation of the wireless communication system according to the present embodiment.

  First, the wireless reader / writer 100 irradiates a continuous wave in the UHF band (step S101: radio wave irradiation step). In the passive tag 200, the power storage unit 202 stores continuous wave energy (step S102: power storage process), and the modulation / demodulation unit 203, the control unit 204, and the memory 205 use the stored energy (step S103: first). Energy utilization process), the continuous wave is load-modulated, and the position information is broadcast by the broadcast unit 206 (step S105: data broadcasting process). Further, in the semi-passive tag 250, the modem unit 203, the control unit 204, and the memory 205 use the energy of the built-in battery 252 (step S104: second energy use step) to load modulate the continuous wave. The position information is broadcast by the broadcast unit 206 (step S105: data broadcasting step).

  Next, in the mobile phone 300, the location information receiving unit 301 receives the location information (step S106), and the location information received by the location information receiving unit 301 and the map received by the map information receiving unit 302 from the map server device 400 in advance. Based on the information, a map indicating the current location is displayed on the screen (step S107) (steps S106 to S107: data receiving step).

  FIG. 9 is a flowchart showing an example of the operation of the positioning system according to the present embodiment.

  First, the receiving device 700 receives navigation data from the GPS satellite 500 (step S201), and transmits orbit information of the navigation data (step S202) (steps S201 to S202: reception process). The wireless LAN access point 600 transmits the trajectory information transmitted by the receiving device 700 to the mobile phone 300 (step S203: trajectory information transmission step). In the mobile phone 300, the trajectory information receiving unit 305 receives trajectory information from the wireless LAN access point 600 (step S204: trajectory information receiving step).

  When the mobile phone 300 moves from the closed space to the open space (step S205), the navigation data receiving unit 306 receives the navigation data from the GPS satellite 500 in the mobile phone 300 (step S206: navigation data receiving step). Then, the positioning unit 307 performs positioning using the trajectory information received by the trajectory information receiving unit 305 in step S204 and the navigation data received by the navigation data receiving unit 306 in step S206 (step S207: positioning step).

  As described above, in the present embodiment, a plurality of wireless communication devices broadcast data by modulating the radio waves emitted by the radio wave irradiation device with the data stored in the storage unit, and the mobile terminal is a wireless communication device. By receiving and using data broadcasted by the mobile terminal, it is possible to read data from a tag that the mobile terminal is not in proximity and to improve the efficiency of communication when the mobile terminal reads data from the tag Become.

  In this embodiment, a wireless communication device installed at a location within a predetermined distance from the radio wave irradiation device stores radio wave energy irradiated by the radio wave irradiation device, and uses the stored energy for internal operations. A wireless communication device installed at a location exceeding a predetermined distance from the radio wave irradiation device has a battery, and the energy stored in the battery in advance is used for internal operations. It is possible to use radio waves emitted by the radio wave irradiation device.

  In the present embodiment, the radio wave irradiation device transmits command data for controlling each wireless communication device and stored data to be stored in each wireless communication device, and transmits either the command data or the stored data. The radio communication device modulates the radio wave to be transmitted, and each wireless communication device demodulates the radio wave emitted by the radio wave irradiation device to obtain the command data, and demodulates the radio wave according to the content of the acquired command data. Acquire stored data, store the acquired stored data in the storage unit, and broadcast the stored data stored in the storage unit, so that the radio wave irradiation device can update the data stored in each wireless communication device It becomes.

  In the present embodiment, in the mobile terminal, the map information receiving unit receives the map information transmitted by the map server device, and the output unit includes the location information and map information included in the data broadcast by the wireless communication device. By outputting a map indicating the current location based on the map information received by the receiving unit, the user of the mobile terminal can easily confirm the current location.

  In the present embodiment, the radio wave irradiation device radiates radio waves of a predetermined frequency in the radio wave irradiation step, and the plurality of wireless communication devices store the radio waves irradiated in the radio wave irradiation step in the data broadcasting step. A tag that is not in close proximity to the mobile terminal when the mobile terminal receives and uses the data broadcast in the data broadcasting process in the data receiving process by modulating the data stored in the data and broadcasting the data. It is possible to improve the efficiency of communication when the mobile terminal reads data from the tag.

  In the present embodiment, in the power storage process, the wireless communication device installed at a location within a predetermined distance from the radio wave irradiation device stores the energy of the radio wave irradiated by the radio wave irradiation device, and the first energy use step Then, those wireless communication devices use the energy stored in the power storage process for internal operations, and in the second energy use step, other wireless communication installed in a place exceeding a predetermined distance from the radio wave irradiation device Since the device uses the energy stored in the battery in advance for internal operations, many wireless communication devices can use the radio waves emitted by one radio wave irradiation device.

  In the present embodiment, in the mobile terminal, the orbit information receiving unit receives the orbit information included in the navigation data received by the receiving device via the transmission device, and the navigation data receiving unit receives the positioning satellite from the positioning satellite. The mobile terminal receives at least a part of the navigation data, and the positioning unit performs positioning based on the orbit information received by the orbit information receiving unit and at least a part of the navigation data received by the navigation data receiving unit. However, it becomes possible to acquire a positioning satellite in a shorter time.

  In the present embodiment, in the mobile terminal, the map information receiving unit receives the map information transmitted by the map server device, and the output unit receives the result of the positioning performed by the positioning unit and the map information receiving unit. By outputting a map indicating the current location based on the map information, the user of the mobile terminal can easily confirm the current location.

  In the present embodiment, the orbit information includes at least a part of the GPS ephemeris data, so that the mobile terminal can capture the positioning satellite in a shorter time.

  In the present embodiment, in the receiving step, the receiving device receives the navigation data from the positioning satellite, transmits the orbit information included in the received navigation data, and in the orbit information transmitting step, the transmitting device receives the receiving step. In the orbit information receiving process, the mobile terminal receives the orbit information transmitted in the orbit information transmitting process, and in the navigation data receiving process, the mobile terminal receives the navigation information from the positioning satellite. At least a part of the data is received, and in the positioning step, the mobile terminal performs positioning based on the orbit information received in the orbit information receiving step and at least a part of the navigation data received in the navigation data receiving step As a result, the mobile terminal can acquire the positioning satellite in a shorter time.

  In the present embodiment, in the map server device, the receiving unit receives the trajectory information included in the navigation data received by the receiving device, the storage unit stores the map information, and the transmission unit is the mobile terminal. In addition, by transmitting the trajectory information received by the receiving unit and the map information stored in the storage unit, information used by the mobile terminal for positioning and information used for outputting the positioning result Both can be provided from the map server device.

Embodiment 2. FIG.
The configuration of the radio communication system and the positioning system according to the present embodiment is the same as that of the first embodiment shown in FIG. The configurations of the passive tag, the semi-passive tag, the mobile phone, and the map server device in the present embodiment are the same as those in the first embodiment shown in FIGS. 2, 3, 4, and 5, respectively. is there. The operations of the radio communication system and the positioning system according to the present embodiment are the same as those of the first embodiment shown in FIGS. 8 and 9, for example.

FIG. 10 is a diagram showing an installation example of the wireless reader / writer and tag in the present embodiment. In the example of FIG. 10, stores are arranged on both sides of one passage, and a tag is installed at the entrance of each store. ing. The wireless reader / writer 100 is installed, for example, in the ceiling near the middle of the passage, and irradiates the tag with a continuous wave. Each tag holds an ID as identification information in the memory. It is assumed that a tag installed on the left side from the wireless reader / writer 100 holds an odd-numbered ID, and a tag installed on the right side holds an even-numbered ID.

  In the example of FIG. 10, in order to avoid interference of radio waves transmitted by tags installed in opposite stores, tags with even IDs stop broadcasting while tags with odd IDs are broadcasting data, The wireless reader / writer 100 controls each tag so that the tag having the odd ID stops broadcasting while the tag having the even ID broadcasts the data.

  FIG. 11 is a diagram illustrating an example of command data transmitted on the radio wave emitted by the wireless reader / writer according to the present embodiment. In this figure, for convenience of explanation, the radio wave emitted by the wireless reader / writer 100 is shown as a waveform, the wave when the radio wave is unmodulated is small, and the wave when the radio wave is load-modulated is large. The magnitude of the wave does not necessarily indicate the magnitude of the amplitude.

  As shown in FIG. 11, the wireless reader / writer 100 transmits a command for controlling the tag every time. For example, when a tag having an even-numbered ID is selected as a tag for broadcasting data, the wireless reader / writer 100 first creates a command indicating “broadcast disapproval (ID = odd number)”, and the radio wave emitted by this command The load is modulated and a command is transmitted. A tag that receives a command stops data broadcasting if the ID held by the tag is an odd number. Next, the wireless reader / writer 100 creates a command indicating “broadcast permission (ID = even number)” and transmits this command. If the tag that received the command has an even ID, the tag starts broadcasting data.

  In the present embodiment, the wireless reader / writer 100 designates a tag for permitting data broadcasting depending on whether the ID is an odd number or an even number. For example, the ID is designated to permit broadcasting for each tag. Or you may notify disapproval.

  As described above, in the present embodiment, the radio wave irradiation device selects a wireless communication device that broadcasts data, and transmits command data including identification information that distinguishes each wireless communication device based on the selected result. When transmitting command data, the radio wave to be irradiated is modulated by the command data, and each wireless communication device acquires the command data by demodulating the radio wave irradiated by the radio wave irradiation device, and is included in the acquired command data By determining whether or not to broadcast the data stored in the storage unit based on the information, it is possible to suppress radio wave interference between the wireless communication devices.

Embodiment 3 FIG.
The configurations of the passive tag, the semi-passive tag, and the map server device in the present embodiment are the same as those in the first embodiment shown in FIG. 2, FIG. 3, and FIG. The operation of the radio communication system according to the present embodiment is the same as that of the first embodiment shown in FIG. 8, for example.

  FIG. 12 is a block diagram showing a configuration of the wireless communication system and the positioning system according to the present embodiment. Below, a different part from the structure of the radio | wireless communications system and the positioning system which concerns on Embodiment 1 shown in FIG. 1 is demonstrated.

  The positioning system has a correction system having a function of, for example, DGPS (differential GPS), and the correction system has a reference station 750 whose position coordinates are known in advance.

  The reference station 750 has a GPS antenna, receives navigation data from the GPS satellite 500, and performs positioning. The reference station 750 performs positioning, and calculates an error from a true position (known data) due to an orbit error of the ionosphere or the GPS satellite 500 as a difference in position coordinates or an error of a pseudo distance from the GPS satellite 500. Then, the calculated result is transmitted as correction data to the wireless LAN access point 600 or the map server device 400 via the network 450. This correction data is transmitted to the mobile phone 300 in the same manner as the trajectory information. When the map server device 400 receives the correction data, the reception unit 401 receives the correction data, and the transmission unit 403 receives the correction data via the wireless LAN access point 600 or directly to the mobile phone 300 in the same manner as the trajectory information. 401 transmits the received correction data.

  FIG. 13 is a block diagram illustrating a configuration of the mobile phone according to the present embodiment. Below, a different part from the structure of the mobile telephone in Embodiment 1 shown in FIG. 4 is demonstrated.

  The mobile phone 300 includes a correction data receiving unit 308 and a correction unit 309. The correction data receiving unit 308 receives correction data calculated by the reference station 750 from the wireless LAN access point 600. The correction unit 309 corrects the positioning error performed by the positioning unit 307 using the correction data received by the correction data receiving unit 308.

  FIG. 14 is a flowchart showing the operation of the positioning system according to the present embodiment.

  First, the receiving device 700 receives navigation data from the GPS satellite 500 (step S301), and transmits orbit information of the navigation data (step S302) (steps S301 to S302: reception process). The wireless LAN access point 600 transmits the trajectory information transmitted by the receiving device 700 to the mobile phone 300 (step S303: trajectory information transmission step). In the mobile phone 300, the trajectory information receiving unit 305 receives trajectory information from the wireless LAN access point 600 (step S304: trajectory information receiving step).

  Next, the reference station 750 receives navigation data from the GPS satellite 500 (step S305), performs positioning, calculates correction data (step S306), and transmits the calculated correction data (step S307) (steps S305 to S305). S307: Correction data transmission step). The wireless LAN access point 600 transmits the correction data transmitted from the reference station 750 to the mobile phone 300 (step S308: correction data transmission step). Then, in the mobile phone 300, the correction data receiving unit 308 receives the correction data from the wireless LAN access point 600 (step S309: correction data receiving step).

  When the mobile phone 300 moves from the closed space to the open space (step S310), in the mobile phone 300, the navigation data receiving unit 306 receives navigation data from the GPS satellite 500 (step S311: navigation data receiving step). Then, the positioning unit 307 performs positioning using the trajectory information received by the trajectory information receiving unit 305 in step S304 and the navigation data received by the navigation data receiving unit 306 in step S311 (step S312: positioning step). Subsequently, in the mobile phone 300, the correction unit 309 corrects the positioning error using the correction data received by the correction data reception unit 308 in step S309 (step S313: correction process).

  As described above, in the present embodiment, in the mobile terminal, the correction data receiving unit receives the correction data calculated by the correction system via the transmission device, and the correction unit is received by the correction data receiving unit. By correcting the error of the positioning performed by the positioning unit using the correction data, it is possible to improve the positioning accuracy immediately after the mobile terminal moves from the closed space to the open space.

  In the present embodiment, the reference station receives navigation data from the positioning satellite, calculates correction data based on the received navigation data and known data, transmits the calculated correction data, and the transmission device By transmitting the correction data transmitted by the reference station to the mobile terminal, it is possible to further improve the positioning accuracy immediately after the mobile terminal moves from the closed space to the open space.

  In the present embodiment, in the correction data transmission step, the correction system calculates correction data for correcting the positioning error, transmits the calculated correction data, and in the correction data transmission step, the transmission apparatus sets the correction data. The correction data transmitted in the transmission step is transmitted, and in the correction data reception step, the mobile terminal receives the correction data transmitted in the correction data transmission step. In the correction step, the mobile terminal receives the correction data reception step. By correcting the error in the positioning performed in the positioning process using the correction data received in the above, it is possible to improve the positioning accuracy immediately after the mobile terminal moves from the closed space to the open space.

Embodiment 4 FIG.
The configurations of the passive tag, the semi-passive tag, and the map server device in the present embodiment are the same as those in the first embodiment shown in FIG. 2, FIG. 3, and FIG. The operation of the radio communication system according to the present embodiment is the same as that of the first embodiment shown in FIG. 8, for example.

  FIG. 15 is a block diagram showing a configuration of a radio communication system and a positioning system according to the present embodiment. Below, a different part from the structure of the radio | wireless communications system and the positioning system which concerns on Embodiment 1 shown in FIG. 1 is demonstrated.

  The positioning system has, for example, a correction system having a function of FKP-DGPS (Flachen Color Parameter-Differential GPS) using surface correction parameters, and the correction system includes a plurality of reference stations 800 and a correction server device 850.

  The reference station 800 has a GPS antenna, receives navigation data from the GPS satellite 500, and transmits the navigation data as reference data. One of the reference stations 800 may be used as the receiving device 700 as shown in FIG. 15, but the receiving device 700 may exist separately from the reference station 800.

  The correction server device 850 calculates the pseudo distance correction information of each reference station 800 based on the reference data transmitted from the plurality of reference stations 800. The correction server device 850 associates the calculated pseudo distance correction information with the position information of each reference station 800 and transmits it as correction data to the wireless LAN access point 600 or the map server device 400 via the network 450. This correction data is transmitted to the mobile phone 300 in the same manner as the trajectory information. When the map server device 400 receives the correction data, the reception unit 401 receives the correction data, and the transmission unit 403 receives the correction data via the wireless LAN access point 600 or directly to the mobile phone 300 in the same manner as the trajectory information. 401 transmits the received correction data.

  The configuration of the mobile phone in the present embodiment is the same as that of the third embodiment shown in FIG.

  In the mobile phone 300, the correction data receiving unit 308 receives the correction data calculated by the correction server device 850 from the wireless LAN access point 600. The correction unit 309 corrects the positioning error performed by the positioning unit 307 using the correction data received by the correction data receiving unit 308.

  Here, the mobile phone 300 transmits the trajectory information received by the trajectory information receiving unit 305 and the navigation data received by the navigation data receiving unit 306 to the correction server device 850, and the correction server device 850 detects the position of each reference station 800. The position of the mobile phone 300 may be measured based on the information, the pseudo distance correction information, the trajectory information from the mobile phone 300, and the navigation data, and the measurement result may be notified to the mobile phone 300. In this case, the mobile phone 300 does not need to have the correction data receiving unit 308 and the correction unit 309, and the correction server device 850 has a similar function instead.

  FIG. 16 is a flowchart showing the operation of the positioning system according to the present embodiment.

  First, the receiving device 700 receives navigation data from the GPS satellite 500 (step S401), and transmits orbit information of the navigation data (step S402) (steps S401 to S402: reception process). The wireless LAN access point 600 transmits the trajectory information transmitted by the receiving device 700 to the mobile phone 300 (step S403: trajectory information transmission step). In the mobile phone 300, the trajectory information receiving unit 305 receives trajectory information from the wireless LAN access point 600 (step S404: trajectory information receiving step).

  Next, the reference station 800 receives navigation data from the GPS satellite 500 (step S405), obtains reference data from the navigation data (step S406), and transmits the obtained reference data (step S407). Subsequently, the correction server device 850 receives reference data from the plurality of reference stations 800 (step S408), calculates correction data based on the reference data (step S409), and transmits the calculated correction data (step S410). (Steps S405 to S410: correction data transmission step). The wireless LAN access point 600 transmits the correction data transmitted from the correction server device 850 to the mobile phone 300 (step S411: correction data transmission step). Then, in the mobile phone 300, the correction data receiving unit 308 receives the correction data from the wireless LAN access point 600 (step S412: correction data receiving step).

  When the mobile phone 300 moves from the closed space to the open space (step S413), the navigation data receiving unit 306 receives the navigation data from the GPS satellite 500 in the mobile phone 300 (step S414: navigation data receiving step). Then, the positioning unit 307 performs positioning using the trajectory information received by the trajectory information receiving unit 305 in step S404 and the navigation data received by the navigation data receiving unit 306 in step S414 (step S415: positioning step). Subsequently, in the mobile phone 300, the correction unit 309 corrects the positioning error using the correction data received by the correction data reception unit 308 in step S412 (step S416: correction process).

  As described above, in the present embodiment, a plurality of reference stations receive navigation data from positioning satellites, transmit reference data obtained from the received navigation data, and a correction server device receives from a plurality of reference stations. The mobile terminal is released from the closed space by calculating the correction data based on the reference data, transmitting the calculated correction data, and transmitting the correction data transmitted by the correction server device to the mobile terminal. Positioning accuracy immediately after moving to the space can be further improved.

  In each embodiment described above, the wireless reader / writer 100, the store terminal 150, the map server device 400, the wireless LAN access point 600, and the correction server device 850 can be realized by a computer.

  Although not shown, the wireless reader / writer 100, the shop terminal 150, the map server device 400, the wireless LAN access point 600, and the correction server device 850 include a CPU that executes a program.

  For example, the CPU is connected to a ROM (Read Only Memory), a RAM (Random Access Memory), a communication board, a display device, a K / B (keyboard), a mouse, an FDD (Flexible Disk Drive), and a CDD (Compact Disc) via a bus. Drive), magnetic disk device, optical disk device, printer device, scanner device, and the like.

  The RAM is an example of a volatile memory. ROM, FDD, CDD, magnetic disk device, and optical disk device are examples of nonvolatile memory. These are examples of a storage device or a storage unit.

  Data and information handled by the wireless reader / writer 100, the store terminal 150, the map server device 400, the wireless LAN access point 600, and the correction server device 850 of each embodiment described above are stored in a storage device or a storage unit, and the wireless reader / Writer 100, store terminal 150, map server device 400, wireless LAN access point 600, and correction server device 850 are recorded and read.

  The communication board is connected to a wide area network (WAN) such as a LAN, the Internet, or ISDN (Integrated Services Digital Network).

  The magnetic disk device stores an operating system (OS), a window system, a program group, and a file group (database). The program group is executed by a CPU, OS, and window system.

  Each part of the wireless reader / writer 100, the shop terminal 150, the map server device 400, the wireless LAN access point 600, and the correction server device 850 may be configured by a program operable by a computer. Alternatively, it may be realized by firmware stored in the ROM. Alternatively, software, hardware, or a combination of software, hardware, and firmware may be used.

  The program group stores a program that causes the CPU to execute the processing described as “˜unit” in the description of the embodiment. These programs are created by a computer language such as C language, HTML (Hyper Text Markup Language), SGML (Standard Generalized Markup Language), or XML (extensible Markup Language).

  The program is stored in other recording media such as a magnetic disk device, FD (Flexible Disk), optical disk, CD (compact disk), MD (mini disk), DVD (Digital Versatile Disk), and read by the CPU. And executed.

FIG. 2 is a block diagram illustrating a configuration of a wireless communication system and a positioning system according to the first embodiment. FIG. 3 is a block diagram illustrating a configuration of a passive tag according to Embodiment 1. FIG. 3 is a block diagram illustrating a configuration of a semi-passive tag according to the first embodiment. 2 is a block diagram illustrating a configuration of a mobile phone in Embodiment 1. FIG. FIG. 2 is a block diagram showing a configuration of a map server device in the first embodiment. 3A and 3B illustrate an installation example of a wireless reader / writer and a tag in Embodiment 1. FIG. 3 is a diagram illustrating an example of command data that is transmitted on radio waves emitted by the wireless reader / writer according to Embodiment 1. FIG. FIG. 3 is a flowchart showing an example of operation of the wireless communication system according to the first embodiment. FIG. 3 is a flowchart showing an example of the operation of the positioning system according to the first embodiment. FIG. 6 illustrates an example of installation of a wireless reader / writer and a tag in Embodiment 2. 6 is a diagram illustrating an example of command data transmitted by being transmitted on radio waves emitted by a wireless reader / writer according to Embodiment 2. FIG. FIG. 6 is a block diagram illustrating a configuration of a wireless communication system and a positioning system according to a third embodiment. FIG. 9 is a block diagram illustrating a structure of a mobile phone in Embodiment 3. FIG. 10 is a flowchart showing an example of the operation of the positioning system according to the third embodiment. FIG. 6 is a block diagram illustrating a configuration of a wireless communication system and a positioning system according to a fourth embodiment. FIG. 10 is a flowchart showing an example of the operation of the positioning system according to the fourth embodiment.

Explanation of symbols

  100 wireless reader / writer, 150 store terminal, 200 passive tag, 201 detection unit, 202 power storage unit, 203 modulation / demodulation unit, 204 control unit, 205 memory, 206 broadcasting unit, 250 semi-passive tag, 252 battery, 300 mobile phone 301 Position information receiving unit 302 Map information receiving unit 303 Control unit 304 Output unit 305 Trajectory information receiving unit 306 Navigation data receiving unit 307 Positioning unit 08 Correction data receiving unit 309 Correction unit 400 Map server Device 401 reception unit 402 map information database 403 transmission unit 450 network 500 GPS satellite 600 wireless LAN access point 650 LAN 700 reception device 750 reference station 800 reference station 850 correction server device

Claims (10)

A receiving device that receives navigation data from a positioning satellite and transmits orbit information included in the received navigation data;
A transmission device for transmitting orbit information transmitted by the receiving device;
A mobile terminal that performs positioning based on navigation data of positioning satellites,
The mobile terminal is
An orbit information receiving unit for receiving orbit information transmitted by the transmission device;
A navigation data receiver for receiving at least part of the navigation data from the positioning satellite;
A positioning system comprising: a positioning unit that performs positioning based on orbit information received by the orbit information receiving unit and at least part of the navigation data received by the navigation data receiving unit. The positioning system further includes:
A correction system that calculates correction data for correcting positioning errors and transmits the calculated correction data is provided.
The transmission apparatus is
Transmit the correction data transmitted by the correction system;
The mobile terminal further includes:
A correction data receiving unit for receiving correction data transmitted by the transmission device;
The positioning system according to claim 1, further comprising: a correction unit that corrects an error in positioning performed by the positioning unit using the correction data received by the correction data receiving unit. The correction system includes:
Receiving the navigation data from the positioning satellite, calculating the correction data based on the received navigation data and known data, comprising a reference station for transmitting the calculated correction data,
The transmission apparatus is
The positioning system according to claim 2, wherein the correction data transmitted from the reference station is transmitted to the mobile terminal. The correction system includes:
A reference station that receives navigation data from a positioning satellite and transmits reference data obtained from the received navigation data;
A correction server device that calculates the correction data based on reference data received from a plurality of reference stations, and transmits the calculated correction data;
The transmission apparatus is
The positioning system according to claim 2, wherein the correction data transmitted by the correction server device is transmitted to the mobile terminal. The positioning system further includes:
It has a map server device that accumulates map information and transmits the accumulated map information,
The mobile terminal is
A map information receiving unit for receiving the map information transmitted by the map server device;
The output part which outputs the map which shows the present location based on the result of the positioning which the said positioning part performed, and the map information which the said map information receiving part received is provided, The any one of Claim 1 to 4 characterized by the above-mentioned. The positioning system described in.   The positioning system according to any one of claims 1 to 5, wherein the orbit information includes at least a part of ephemeris data of GPS (Global Positioning System). A receiving step for receiving navigation data from a positioning satellite and transmitting orbit information included in the received navigation data;
A trajectory information transmission step in which the transmission device transmits the trajectory information transmitted in the reception step;
A mobile terminal receives orbit information transmitted in the orbit information transmission step, orbit information receiving step,
A navigation data receiving step in which the mobile terminal receives at least part of the navigation data from the positioning satellite;
A mobile terminal comprises a positioning step that performs positioning based on the trajectory information received in the trajectory information receiving step and at least a part of the navigation data received in the navigation data receiving step. Method. The positioning method further includes:
A correction data calculating step for calculating correction data for correcting a positioning error, and transmitting the calculated correction data;
A correction data transmission step in which the transmission device transmits the correction data transmitted in the correction data transmission step;
A correction data receiving step in which the mobile terminal receives the correction data transmitted in the correction data transmission step;
The positioning according to claim 7, wherein the mobile terminal comprises a correction step of correcting an error in positioning performed in the positioning step using the correction data received in the correction data receiving step. Method. In mobile terminals that perform positioning based on navigation data of positioning satellites,
An orbit information receiving unit that receives orbit information included in the navigation data received by the receiving device that receives the navigation data from the positioning satellite via the transmission device that transmits the data;
A navigation data receiver for receiving at least part of the navigation data from the positioning satellite;
A mobile terminal comprising: a positioning unit that performs positioning based on orbit information received by the orbit information receiving unit and at least part of the navigation data received by the navigation data receiving unit. A receiver that receives orbit information included in the navigation data received by the receiver from a receiver that receives navigation data from the positioning satellite;
An accumulator that accumulates map information;
A map server comprising: a mobile terminal that performs positioning based on navigation data of a positioning satellite; and a transmission unit that transmits orbit information received by the reception unit and map information stored in the storage unit. apparatus.

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