JP2006071466A - Moving direction judging system, moving direction judging method, program and record medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moving direction judging system judging the moving direction of a radio tag by utilizing a wave strength value detected with radio tag readers which received a radio wave emitted by the radio tag. <P>SOLUTION: In the moving direction judging system, the radio tag 10 set with an ID emits a radio wave. The radio tag reader 20a and the radio tag reader 20b receives the radio wave from the radio tag 10. The receiver 31 of a server device 30 receives the ID contained in the radio wave and the wave strength value from the radio tag reader 20a and the radio tag reader 20b, classifies the information received with each radio tag reader for each ID, and records the wave strength value in a memory 32. When it detects no reception of the ID information during receiving for a specific time interval, it reads the wave strength value of the ID out of the memory 32, and judges the moving direction of the radio tag 10 between the radio tag reader 20a and the radio tag reader 20b according to the time variation history of the wave strength value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a movement direction determination system, a movement direction determination method, a program, and a recording medium that mainly use a wireless transmission device and a wireless reception device and determine the movement direction of an object to which the wireless transmission device is attached.

In the conventional technology, when detecting the state of a person entering or leaving a certain place, a person is provided with a contact type IC (Integrated Circuit) tag, and the person is provided with an IC tag in a receiving device provided at the entrance / exit. Detecting the entrance / exit state by setting the terminal, or detecting the entrance / exit state by holding the contactless IC tag in the vicinity of the receiving device provided at the entrance / exit Is generally used.
Patent Document 1 discloses an IC tag having an RFID (Radio Frequency Identification) method, which detects an entrance / exit state using an IC tag that operates as a wireless transmission device that transmits a radio wave by infrared irradiation. (Hereinafter, an RFID-type IC tag is referred to as a wireless tag). In this means, infrared transmitters for irradiating different infrared wavelengths are provided on both sides of the entrance and exit, and the wireless tag held by the entrance / exit is activated by the infrared rays irradiated from the infrared transmitter. The wireless tag that has received the infrared rays determines the infrared ray emitted from which infrared ray transmission device from the wavelength of the infrared signal, and recognizes the position information of the infrared ray transmission device. Next, ID (IDentification) information set inside and the position information of the infrared transmitter are transmitted to a tag reader which is a wireless receiver. Then, based on the position information of the infrared ray transmitting device received by the tag reader and the ID of the wireless tag, the moving direction of the entrance / exit person is detected to enable the entrance / exit management.
Japanese Patent Laid-Open No. 2003-21679

  However, in the technique shown in Patent Document 1, the direction of entry / exit, that is, the moving direction is determined by using infrared rays with high directivity and irradiating infrared rays in a narrow area such as the entrance and exit areas and activating the wireless tag. Therefore, there is a problem in that an infrared transmitter is installed and a wireless tag that operates in conjunction with infrared rays is required.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to use a radio wave intensity value detected by a radio tag reader that has received a radio wave transmitted from a radio tag that is a radio transmission device. A moving direction determination system, a moving direction determination method, a program, and a recording medium capable of determining a moving direction are provided.

  In order to solve the above-described problem, the present invention provides two radio waves including the ID information transmitted from a wireless transmission device (wireless tag 10) in which uniquely identifiable ID information is set in an internal storage circuit. In a server device (server device 30) connected to a wireless reception device (wireless tag reader 20a, 20b or wireless tag reader 50) that can be measured at one measurement point, the ID information read from the wireless wave by the wireless reception device and Receiving means for receiving, from the wireless receiver, a radio wave intensity value of the radio wave measured by the wireless receiver and measurement point identification information uniquely identifying the measurement point assigned to each of the measurement points When the ID information, the radio wave intensity value, and the measurement point identification information are received by the (reception unit 31) and the reception unit, the measurement is performed for each ID information. Recording means (receiving unit 31) for classifying the radio field intensity values based on point identification information and recording them in an internal storage area, and detecting that the ID information being received has not been received for a predetermined time And reading out the radio field intensity value for each of the measurement point identification information corresponding to the ID information from the internal storage area, and the ID between the two measurement points based on a temporal change history of the radio field intensity value And a determination unit (determination unit 34) that determines a moving direction of the wireless transmission device corresponding to the information, and an output unit (output unit 35) that outputs a determination result determined by the determination unit. Server device.

  The present invention includes a storage circuit (ID storage circuit 11a) that stores uniquely identifiable ID information, reads out the ID information from the storage circuit, and transmits a radio wave including the ID information (wireless transmission device). In the tag 10), while the vibration is detected by the intermittent transmission circuit (intermittent transmission circuit 11b) that intermittently transmits the radio wave, the vibration detection circuit (vibration detection circuit 11c) that detects vibration, and the vibration detection circuit Comprises a continuous transmission circuit (continuous transmission circuit 11d) that stops the intermittent transmission circuit and continues to transmit the radio wave at an interval shorter than the transmission interval of the intermittent transmission circuit. It is.

  The present invention is a wireless system that can connect to a server device and measure a radio wave including the ID information transmitted from a wireless transmission device in which uniquely identifiable ID information is set in an internal storage circuit at two measurement points. In a receiving device (wireless tag readers 20a and 20b), radio wave receiving means (wireless receiving antennas 24a and 24b) for receiving the radio waves, and measuring means (control units 21a and 21b) for measuring radio wave intensity values of the radio waves. And a reading means (control units 21a and 21b) for reading the ID information from the radio wave, and the ID information read by the reading means and the radio wave intensity value measured by the measuring means. Transmission means (communication units 22a and 22b) that associate the measurement point identification information assigned to each possible measurement point and transmit the information to the server device in association with each other. A radio receiving apparatus according to claim.

  The present invention provides a wireless transmission device in which uniquely identifiable ID information is set in an internal storage circuit, a wireless reception device capable of measuring wireless radio waves transmitted from the wireless transmission device at two measurement points, In the moving direction determination system configured by a server device connected to a wireless reception device, the wireless transmission device includes an intermittent transmission circuit that intermittently transmits the radio wave, a vibration detection circuit that detects vibration, and the vibration detection A continuous transmission circuit that stops the intermittent transmission circuit and continuously transmits the radio wave at an interval shorter than the transmission interval of the intermittent transmission circuit while vibration is detected by the circuit, and the wireless reception device A radio wave receiving means for receiving the radio wave, a measuring means for measuring a radio wave intensity value of the radio wave, and a reader for reading out the ID information from the radio wave And the server by associating the ID information read by the reading unit with the radio wave intensity value measured by the measuring unit and the measurement point identification information given to each of the measurement points that can be uniquely identified Transmitting means for transmitting to the apparatus, wherein the server apparatus receives the ID information, the radio wave intensity value, and the measurement point identification information from the wireless receiving apparatus, and the receiving means. A recording unit for receiving the ID information, the radio wave intensity value, and the identification information, classifying the radio wave intensity value for each of the ID information based on the measurement point identification information and recording it in an internal storage area; When it is detected that the ID information is not received within a predetermined time, the radio field strength for each measurement point identification information corresponding to the ID information is stored from the internal storage area. A determination unit that reads a value and determines a moving direction of the wireless transmission device corresponding to the ID information between the two measurement points based on a temporal change history of the radio field intensity value; And a moving direction determination system characterized by comprising output means for outputting the determination result.

  The present invention provides a wireless transmission device in which uniquely identifiable ID information is set in an internal storage circuit, a wireless reception device capable of measuring wireless radio waves transmitted from the wireless transmission device at two measurement points, In a moving direction determination method for determining a moving direction of the wireless transmission device by a server device connected to the wireless reception device, the wireless transmission device transmits the wireless radio wave including the ID information, and the wireless reception A process in which the apparatus receives the radio wave and measures a radio field intensity value of the radio wave; a process in which the radio reception apparatus reads the ID information from the received radio wave; and the radio reception apparatus reads out The ID information, the measured radio field intensity value, and measurement point identification information that can uniquely identify the measurement point assigned to each measurement point are associated with each other and transmitted to the server device. A process in which the server device receives the ID information, the radio wave intensity value, and the measurement point identification information from the wireless receiver, and the server device receives the ID information from the wireless receiver. And when receiving the radio field intensity value and the measurement point identification information, the process of classifying the radio field intensity value based on the measurement point identification information for each ID information and recording it in an internal storage area, and the server device Reads out the radio field intensity value for each measurement point identification information corresponding to the ID information from the internal storage area when it is detected that the ID information being received has not been received for a predetermined time. Determining a moving direction of the wireless transmission device corresponding to the ID information between the two measurement points based on a temporal change history of the radio field intensity value; and A step of outputting a judgment result of the direction, a moving direction determination method characterized by comprising the.

  The present invention provides a server for connecting a radio wave including the ID information transmitted from a radio transmission device in which uniquely identifiable ID information is set in an internal storage circuit to a radio reception device capable of measuring at two measurement points. The computer of the apparatus, the ID information read from the radio wave by the radio receiver, the radio wave intensity value of the radio wave measured by the radio receiver, and the measurement given to each measurement point Receiving means for receiving measurement point identification information capable of uniquely identifying a point from the wireless reception device; and when receiving the ID information, the radio wave intensity value, and the measurement point identification information by the receiving means, the ID information Recording means for classifying the radio field intensity values on the basis of the measurement point identification information and recording them in an internal storage area, and not receiving the ID information being received during a predetermined time. Is detected, the radio field intensity value for each of the measurement point identification information corresponding to the ID information is read from the internal storage area, and the two measurement points are read based on the temporal change history of the radio field intensity value. It is a computer program for functioning as a determination unit that determines a moving direction of the wireless transmission device corresponding to the ID information in between, and an output unit that outputs a determination result determined by the determination unit.

  The present invention provides a server for connecting a radio wave including the ID information transmitted from a radio transmission device in which uniquely identifiable ID information is set in an internal storage circuit to a radio reception device capable of measuring at two measurement points. The computer of the apparatus, the ID information read from the radio wave by the radio receiver, the radio wave intensity value of the radio wave measured by the radio receiver, and the measurement given to each measurement point Receiving means for receiving measurement point identification information capable of uniquely identifying a point from the wireless reception device; and when receiving the ID information, the radio wave intensity value, and the measurement point identification information by the receiving means, the ID information Recording means for classifying the radio field intensity values on the basis of the measurement point identification information and recording them in an internal storage area, and not receiving the ID information being received during a predetermined time. Is detected, the radio field intensity value for each of the measurement point identification information corresponding to the ID information is read from the internal storage area, and the two measurement points are read based on the temporal change history of the radio field intensity value. A computer readable recording computer program for functioning as a determination means for determining a moving direction of the wireless transmission device corresponding to the ID information in between, an output means for outputting a determination result determined by the determination means It is a recording medium.

  According to the present invention, the server device has the ID information read from the radio wave by the radio receiver that can be measured at the two measurement points, the radio wave intensity value of the radio wave measured by the radio receiver, and the measurement point. Measurement point identification information that can uniquely identify the measurement point assigned to each is received from the wireless reception device. When the ID information, the radio wave intensity value, and the measurement point identification information are received, the radio wave intensity values are classified based on the identification information for each ID information and recorded in the internal storage area. When it is detected that the ID information being received has not been received for a predetermined time, the radio wave intensity value for each measurement point identification information corresponding to the ID information is read from the internal storage area, and the radio wave intensity value time The movement direction of the wireless transmission device corresponding to the ID information between the two measurement points is determined based on the historical change history, and the determination result is output. Therefore, it is possible to determine the moving direction when the wireless transmission device moves between two measurement points. Thereby, it is possible to determine the moving direction of the wireless transmission device using only the radio wave transmitted by the wireless transmission device.

  Further, according to the present invention, the wireless transmission device does not intermittently transmit the intermittent transmission circuit that intermittently transmits the radio wave, the vibration detection circuit that detects the vibration, and the vibration detection circuit while detecting the vibration. In addition, a continuous transmission circuit that continuously transmits radio waves at intervals shorter than the transmission interval of the intermittent transmission circuit is provided. Therefore, while detecting the vibration generated by the movement of the person holding the wireless transmission device, the wireless radio wave is continuously transmitted, and detailed wireless radio waves that are continuous at shorter transmission intervals than during intermittent transmission are received. can do. Thereby, even if a person holding the wireless transmission device moves at a high speed, it is possible to determine the moving direction without missing information.

  In addition, according to the present invention, the wireless reception device can measure the radio waves transmitted from the wireless transmission device at two measurement points. In addition, the radio wave intensity value of the received radio wave is measured, the ID information included in the radio wave is read, and the measurement point identification information given to each uniquely identifiable measurement point is used as the radio wave intensity value and the ID information. The information is transmitted to the server device in association with each other. Therefore, the server device can receive the radio wave intensity values measured at two different positions. Thereby, it is possible to detect the moving direction of the wireless transmission device between two different positions.

Hereinafter, a server device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram illustrating a moving direction determination system 1 including a server device, a wireless tag, a wireless tag reader, and a server device according to the present embodiment.
The wireless tag 10 is an IC tag having the above-described RFID method, and the wireless tag in the present embodiment is a type called an active tag that transmits information set inside to a radio wave using its own battery. This is a wireless tag.

  In the wireless tag 10, the wireless interface 13 transmits wireless radio waves to a wireless tag reader (to be described later) via the wireless reception antenna 14. The battery 12 is a power source for activating the wireless tag 10. An active tag having a battery inside, such as the wireless tag 10 of the present embodiment, can generally transmit wireless radio waves from a distance of several meters to several tens of meters. The control part 11 transmits the information memorize | stored inside by a radio wave, and controls transmission of a radio wave. In the control unit 11, the ID recording circuit 11 a stores ID information that can uniquely identify the wireless tag 10 written in advance by a wireless tag writer, that is, a device that writes information by wireless radio waves. The intermittent transmission circuit 11b reads the ID information from the ID storage circuit 11a at a certain time interval, for example, every 3 seconds, and transmits a radio wave including the ID information. The vibration detection circuit 11c detects vibration generated when a person holding the wireless tag 10 moves. The continuous transmission circuit 11d reads the ID information from the ID storage circuit 11a and transmits a radio wave including the ID information at an interval shorter than that during intermittent transmission while the vibration detection circuit 11c detects vibration. Further, since only one of the intermittent transmission circuit 11b and the continuous transmission circuit 11d operates, the intermittent transmission circuit 11b stops while detecting vibration. Furthermore, in order to identify the source of the ID information transmitted by the intermittent transmission circuit 11b or the ID information transmitted by the contact transmission circuit 11d, information for identifying the transmission source is set together with the ID information for transmission. .

  The radio tag readers 20a and 20b receive radio waves from the radio tag 10 and detect ID information from the received radio waves. Since the wireless tag readers 20a and 20b have the same configuration and a and b attached to the reference numerals only indicate that they are different wireless tag readers, the internal configuration will be described using only the numbers excluding the reference characters a and b. To do. The wireless interface 23 receives wireless radio waves transmitted from the wireless tag 10 via the wireless reception antenna 24. The control unit 21 detects the ID information and the radio wave intensity value at the time of reception from the radio wave received by the wireless interface 23, and acquires the time information at the time of reception from the internal clock. The communication unit 22 is connected to the server device 30 via the network 40 and transmits the ID information, the radio wave intensity value, and the time information detected by the control unit 21 to the server device 30.

  The server device 30 determines the moving direction of the wireless tag 10 based on information received via the network 40 from the wireless tag readers 20a and 20b. In the server device 30, the receiving unit 31 receives ID information, a radio wave intensity value, and time information from the wireless tag readers 20a and 20b via the network 40, and classifies each ID information as information received from the wireless tag readers 20a and 20b. The radio field intensity value and time information are recorded in the storage unit 32. If the ID information is continuously received, the recording is continued. When the ID information of the wireless tag 10 received via the wireless tag readers 20a and 20b cannot be received for a predetermined time, it is determined that the wireless tag 10 has moved to a position where the wireless radio wave does not reach the wireless tag readers 20a and 20b. Exit. The smoothing processing unit 33 receives from the receiving unit 31 that the recording of the wireless tag 10 has been completed, and reads the radio wave intensity value and time information of the ID information corresponding to the wireless tag 10 from the storage unit 32. Time synchronization is performed by comparing the time information for each radio wave intensity value received from the wireless tag readers 20a and 20b, and smoothing processing is performed on the two radio wave intensity values arranged on the time axis. The determination unit 34 determines the moving direction of the wireless tag 10 based on the temporal change history of the radio wave intensity value after the smoothing process. The output unit 35 receives the determination result from the determination unit 34 and outputs it to the screen.

FIG. 2 is a diagram illustrating an arrangement configuration of the moving direction determination system 1 and a moving process of the wireless tag 10. In the figure, a gate 60 indicates an entrance / exit. Two wireless tag readers 20 a and 20 b are arranged on one side of the gate 60 in order to determine the moving direction at the entrance / exit of the wireless tag 10 passing through the gate 60. The ellipses surrounding the wireless tag readers 20a and 20b indicate the ranges where the wireless radio waves of the wireless tag 10 reach the wireless tag readers 20a and 20b, respectively. Further, the two RFID tag readers 20a and 20b are connected to the server device 30, and the time is set in advance so as to be the same time. The figure shows a state in which the wireless tag 10 moves as time passes. The wireless tag 10 t0 at the time _t0 is detected by the wireless tag reader 20a because the wireless radio wave does not reach the wireless tag reader 20a. Not. The wireless tag 10 _t1 at the time t1 reaches the wireless tag reader 20a, the wireless tag reader 20a receives the wireless wave, and the server device 30 transmits the ID information, the radio wave intensity value, and the time information. The wireless tag 10 _t2 at the time t2 reaches the wireless tag readers 20a and 20b and is detected by both the wireless tag readers 20a and 20b. At that time, the server device 30 receives the ID information, the radio wave intensity value, and the time information from both the wireless tag readers 20a and 20b. The wireless tag 10 _t3 at the time t3 does not reach the wireless tag reader 20a, but reaches the wireless tag reader 20b. The wireless tag reader 20b detects the wireless wave, and the server device 30 receives the ID information and the radio wave intensity. A value is sent. The wireless tag 10 _t4 at time t4 is spaced beyond the distance the radio wave reaches the wireless tag reader 20b with through the gate 60, also not detected by the wireless tag reader 20b.
At this time, the server device 30 detects that the ID information of the wireless tag 10 or the like has not been received for a predetermined time, and ends the recording. Then, a smoothing process described later is performed on the recorded information, and the moving direction of the wireless tag 10 is determined based on the temporal change history of the radio wave intensity value obtained from the result of the smoothing process.

FIG. 3 shows the ID information, radio wave intensity value, and the like received by the server device 30 from the wireless tag reader 20a and the wireless tag reader 20b (in the figure, the wireless tag reader 20a is abbreviated as reader 20a and the wireless tag reader 20b is abbreviated as reader 20b). It is the figure which showed the data structure when recording in the storage area of.
In the figure, the time shown in the time column is time information according to the clock inside the server device 30, and the time information included in the information received from the wireless tag reader 20a and the wireless tag reader 20b and the server Time synchronization is performed by comparing the time information of the device 30. The information for each ID information includes a Status column for recording identification information indicating the cause of transmission of the radio wave, and an RSSI (RSSI: Received Signal Strength Indicator) for receiving radio wave intensity values received in the A channel and the B channel. Signal intensity display)). The identification information recorded in the Status column is the ID information transmitted by intermittent transmission every time the wireless tag 10 transmits ID information or ID information transmitted by detecting vibration. This is information provided by the wireless tag readers 20a and 20b according to the identification information. In the figure, identification information of M (Motion) indicating that all received information is transmitted by vibration is recorded in the Status column. Further, the radio field strength value shown in the RSSI column indicates that the received radio field intensity is smaller as the value is larger, and the value of “999” can be received by only one of the A channel and the B channel. This is a complementary value for a channel that could not be received.

  The smoothing process performed by the smoothing processing unit 33 is performed on the radio wave intensity value recorded in the RSSI column. The smoothing process in the present embodiment is a process for determining whether or not a certain radio wave intensity has been received for a certain period of time or more and, if so, certifying that it has been stably received. means. As the fixed time, for example, it becomes an index for determining whether or not 10 seconds, which is about three times 3 seconds that is the time interval of the intermittent transmission described above, is stably received. The temporal change history of the radio wave intensity value in the recorded data shown in FIG. 9 is first received by the wireless tag reader 20a only for 10 seconds or more, then received by both the wireless tag readers 20a and 20b for about 10 seconds, and finally the wireless tag reader. Only 20b is in a change state for receiving for 10 seconds or more. When a process of setting “1” when it is determined that reception has been performed, and “0” when it is determined that reception has not been performed, the pattern of change in the radio wave intensity value after the smoothing process is “10”. ”,“ 11 ”,“ 01 ”.

FIG. 4 is a flowchart illustrating a process in which the determination unit 34 determines the moving direction of the wireless tag 10 from the pattern of change in the radio wave intensity value after the smoothing process.
First, a radio wave transmitted from the wireless tag 10 cannot be received by both the wireless tag reader 20a and the wireless tag reader 20b (also shown in FIG. 5 by abbreviating the wireless tag reader 20a as the reader 20a and the wireless tag reader 20b as the reader 20b). In order to determine the time point at which the apparatus 30 finishes recording, the above-described timer for measuring the predetermined time is set. As the timer value, for example, 10 seconds is set as an index for determining whether or not the stable reception is performed when the smoothing process is performed. That is, when the information from the received wireless tag 10 is not received for 10 seconds, it is determined that the wireless tag 10 has moved to a place where wireless radio waves do not reach (step S1). Next, when the ID information of the wireless tag 10 is received from the wireless tag reader 20a or the wireless tag reader 20b, a timer is started (step S2). Next, it is determined whether or not the wireless tag ID has timed out (step S3). If not timed out, the ID information is kept waiting. If it is received during Tint, the timer value is reset (step S4). When the timer value of Tint has elapsed and timed out, the information recorded in the server device 30 is smoothed. In the smoothing process, “10” is assigned when the wireless tag reader 20a is receiving and the wireless tag reader 20b is not receiving, and the smoothing process is not received by the wireless tag reader 20a and is received by the wireless tag reader 20b. Is assigned “01”, and “11” is assigned if both are received by both the wireless tag reader 20a and the wireless tag reader 20b (step S5).

  Next, the moving direction is determined based on the smoothed value. First, it is confirmed whether or not the status at the start of reception is “10” (step S6). In the case of “10”, it is confirmed whether or not the status at the time-out is “01” (step S7). If the status at the time-out is “01”, it is determined that the wireless tag 10 has moved from the wireless tag reader 20a toward the wireless tag reader 20b, and the process is terminated (step S8). If the status at the time-out is not “01”, it is determined as an exceptional state that the U-turn has been moved from the wireless tag reader 20a to the wireless tag reader 20a, and the process is terminated (step S9). In step S6, if the status at the start of reception is not “10”, it is next checked whether the status of reception start is “01” (step S10). If the reception start status is “01”, it is confirmed whether or not the status at the time of next timeout is “10” (step S11). If the status at the time-out is “10”, it is determined that the wireless tag reader 20b has moved in the direction of the wireless tag reader 20a, and the process is terminated (step S12). If the status at the time-out is not “10”, it is determined as an exceptional state that the U-turn has moved from the wireless tag reader 20b to the wireless tag reader 20b, and the process ends (step S13). If the reception start status is not “01” in step S10, it is determined as an exceptional state that the wireless tag reader 20a and the wireless tag reader 20b are simultaneously received from the reception start time, and the process ends (step S14). In this manner, the movement direction of the wireless tag 10 is determined by determining the change pattern of the radio wave intensity value.

  FIG. 5 is a block diagram showing an internal configuration of a wireless tag reader 50 including two wireless receiving antennas that can be used in place of the two wireless tag readers 20a and 20b described in FIG. The wireless tag reader 50 is different from the above-described wireless tag readers 20a and 20b in that one wireless tag reader includes wireless receiving antennas 54a and 54b. In the wireless tag reader 50, the control unit 51 receives the ID information and the radio wave intensity value from the wireless tag 10 via the wireless interfaces 53a and 54b, adds identification information indicating which wireless antenna has received, and the communication unit 52. Is transmitted to the server device 30 via. The wireless interfaces 53a and 53b and the communication unit 52 have the same mechanism as that of the wireless tag reader 20 described above, and thus description thereof is omitted. The presence of two wireless antennas installed at a certain distance is an essential configuration of the moving direction determination system 1, and there is no difference in the configuration itself even if the wireless tag reader 50 is replaced. However, the information received via the network 40 from the two RFID tag readers 20a and 20b needs to be time-synchronized in order to correct the deviation caused by the network 40 delay. On the other hand, when the server device 30 determines the moving direction based on information received by one wireless tag reader 50, time information is generated because time information is set at the time of measurement inside the wireless tag reader 50. There is an effect that it is not necessary to perform the time synchronization processing in the server device 30 without doing so.

  In the above-described embodiment, 3 seconds is set as the interval of intermittent transmission, and the fixed time of the smoothing process and the timer value Tint are set to 10 seconds, which is about three times 3 seconds. The value can be freely set by the user, and may be adjusted while measuring in an actual environment.

  The server device 30 in the moving direction determination system 1 described above has a computer system therein. The moving direction determination process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

It is a block diagram which shows the movement direction determination system by this embodiment. It is the figure which showed the arrangement configuration of the moving direction determination system in the same embodiment, and the movement of a wireless tag. It is a figure for demonstrating the smoothing process in the same embodiment. It is the flowchart which showed the determination process of the moving direction in the embodiment. It is the block diagram which showed the internal structure of the wireless tag reader provided with two wireless receiving antennas in the same embodiment.

Explanation of symbols

10 wireless tag 20a wireless tag reader 20b wireless tag reader 24a wireless receiving antenna 24b wireless receiving antenna 30 server device 31 receiving unit 32 storage unit 33 smoothing processing unit 34 determination unit 35 output unit

Claims (7)

In a server device for connecting a radio wave including the ID information transmitted from a wireless transmission device in which uniquely identifiable ID information is set in an internal storage circuit to a wireless reception device capable of measuring at two measurement points,
Uniquely identifies the ID information read from the radio wave by the radio receiver, the radio wave intensity value of the radio wave measured by the radio receiver, and the measurement point assigned to each measurement point Receiving means for receiving possible measurement point identification information from the wireless receiver;
When the ID information, the radio wave intensity value, and the identification information are received by the receiving unit, the radio wave intensity value is classified based on the measurement point identification information for each ID information and recorded in an internal storage area Means,
When it is detected that the ID information being received has not been received for a predetermined time, the radio field intensity value for each measurement point identification information corresponding to the ID information is read from the internal storage area, Determination means for determining a moving direction of the wireless transmission device corresponding to the ID information between the two measurement points based on a temporal change history of a radio wave intensity value;
Output means for outputting the determination result determined by the determination means;
A server device comprising: In a wireless transmission device that includes a storage circuit that stores uniquely identifiable ID information, reads the ID information from the storage circuit, and transmits a radio wave including the ID information.
An intermittent transmission circuit for intermittent transmission of the radio wave;
A vibration detection circuit for detecting vibration;
While detecting vibration by the vibration detection circuit, the continuous transmission circuit that stops the intermittent transmission circuit and continues to transmit the radio wave at an interval shorter than the transmission interval of the intermittent transmission circuit;
A wireless transmission device comprising: In a wireless reception device that is connected to a server device and is capable of measuring a radio wave including the ID information transmitted from a wireless transmission device in which uniquely identifiable ID information is set in an internal storage circuit, at two measurement points.
A radio wave receiving means for receiving the radio wave;
Measuring means for measuring a radio field intensity value of the radio wave;
Reading means for reading the ID information from the radio wave;
The ID information read by the reading means and the radio wave intensity value measured by the measuring means are associated with the measurement point identification information given to each measurement point that can be uniquely identified in the server device. A transmission means for transmitting;
A radio receiving apparatus comprising: A wireless transmission device in which uniquely identifiable ID information is set in an internal storage circuit, a wireless reception device capable of measuring wireless radio waves transmitted from the wireless transmission device at two measurement points, and the wireless reception device In a moving direction determination system configured by a server device to be connected,
The wireless transmission device is
An intermittent transmission circuit for intermittent transmission of the radio wave;
A vibration detection circuit for detecting vibration;
While detecting vibration by the vibration detection circuit, the continuous transmission circuit that stops the intermittent transmission circuit and continues to transmit the radio wave at an interval shorter than the transmission interval of the intermittent transmission circuit;
Composed by
The wireless receiver is
A radio wave receiving means for receiving the radio wave;
Measuring means for measuring a radio field intensity value of the radio wave;
Reading means for reading the ID information from the radio wave;
The ID information read by the reading means and the radio wave intensity value measured by the measuring means are associated with the measurement point identification information given to each measurement point that can be uniquely identified in the server device. A transmission means for transmitting;
Composed by
The server device
Receiving means for receiving the ID information, the radio field intensity value, and the measurement point identification information from the wireless receiver;
When the ID information, the radio wave intensity value, and the identification information are received by the receiving unit, the radio wave intensity value is classified based on the measurement point identification information for each ID information and recorded in an internal storage area Means,
When it is detected that the ID information being received has not been received for a predetermined time, the radio field intensity value for each measurement point identification information corresponding to the ID information is read from the internal storage area, Determination means for determining a moving direction of the wireless transmission device corresponding to the ID information between the two measurement points based on a temporal change history of a radio wave intensity value;
Output means for outputting the determination result determined by the determination means;
A moving direction determination system comprising: A wireless transmission device in which uniquely identifiable ID information is set in an internal storage circuit, a wireless reception device capable of measuring wireless radio waves transmitted from the wireless transmission device at two measurement points, and the wireless reception device In a moving direction determination method for determining a moving direction of the wireless transmission device by a server device to be connected,
A process in which the wireless transmission device transmits the wireless radio wave including the ID information;
The wireless receiving device receiving the wireless radio wave and measuring a radio wave intensity value of the radio wave;
The wireless receiving device reads the ID information from the received radio wave;
The wireless reception device associates the read ID information, the measured radio field intensity value, and the measurement point identification information that can uniquely identify the measurement point assigned to each measurement point in association with the server device. Sending process,
A process in which the server device receives the ID information, the radio field intensity value, and the measurement point identification information from the wireless reception device;
When the server apparatus receives the ID information, the radio wave intensity value, and the measurement point identification information from the radio reception apparatus, the server apparatus classifies the radio wave intensity value based on the measurement point identification information for each ID information. Recording in the internal storage area,
When the server device detects that the ID information being received has not been received for a predetermined time, the radio wave intensity for each measurement point identification information corresponding to the ID information from the internal storage area Reading a value and determining a moving direction of the wireless transmission device corresponding to the ID information between the two measurement points based on a temporal change history of the radio field intensity value;
A process in which the server device outputs a determination result of the moving direction;
A moving direction determination method comprising: A computer of a server device for connecting a wireless radio wave including the ID information transmitted from a wireless transmission device whose ID information uniquely identifiable is set in an internal storage circuit to a wireless reception device capable of measuring at two measurement points ,
Uniquely identifies the ID information read from the radio wave by the radio receiver, the radio wave intensity value of the radio wave measured by the radio receiver, and the measurement point assigned to each measurement point Receiving means for receiving possible measurement point identification information from the wireless receiver;
When the receiving means receives the ID information, the radio wave intensity value, and the measurement point identification information, the radio wave intensity value is classified for each ID information based on the measurement point identification information and recorded in an internal storage area. Recording means,
When it is detected that the ID information being received has not been received for a predetermined time, the radio field intensity value for each measurement point identification information corresponding to the ID information is read from the internal storage area, Determination means for determining a moving direction of the wireless transmission device corresponding to the ID information between the two measurement points based on a temporal change history of a radio wave intensity value;
Output means for outputting the determination result determined by the determination means;
Computer program to function as. A computer of a server device for connecting a wireless radio wave including the ID information transmitted from a wireless transmission device whose ID information uniquely identifiable is set in an internal storage circuit to a wireless reception device capable of measuring at two measurement points ,
Uniquely identifies the ID information read from the radio wave by the radio receiver, the radio wave intensity value of the radio wave measured by the radio receiver, and the measurement point assigned to each measurement point Receiving means for receiving possible measurement point identification information from the wireless receiver;
When the receiving means receives the ID information, the radio wave intensity value, and the measurement point identification information, the radio wave intensity value is classified for each ID information based on the measurement point identification information and recorded in an internal storage area. Recording means,
When it is detected that the ID information being received has not been received for a predetermined time, the radio field intensity value for each measurement point identification information corresponding to the ID information is read from the internal storage area, Determination means for determining a moving direction of the wireless transmission device corresponding to the ID information between the two measurement points based on a temporal change history of a radio wave intensity value;
Output means for outputting the determination result determined by the determination means;
A computer-readable recording medium on which a computer program for functioning as a computer is recorded.

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