JP2002221563A - Gps position detection device and gps position detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always provide effective and newest GPS assist information without requiring a communication expense from an owner of a GPS position detection device. SOLUTION: This device is equipped with a voice conversation processing part 1c for executing bidirectional voice conversation between calling from a conversation terminal 3a and a called communication terminal 3a, a GPS positioning operation processing part 1a for processing GPS assist data 2a transmitted from a GPS assist server 2 connected on a communication network, and a voice/data processing part 1d for distributing packet data including a voice signal for conversation and packet data including the GPS assist data 2a. The GPS positioning operation processing part 1a has a constitution for receiving the GPS assist data taken out by the voice/data processing part 1d at the conversation time with the conversation terminal 3a, and re-memorizing the data periodically in a memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a GPS position detecting device having a function of performing a two-way call and data communication with a call terminal connected to a communication network and a GPS assist server via a radio base station. , And a GPS position detection system provided with the device.

[0002]

2. Description of the Related Art A weak high-frequency radio wave (hereinafter referred to as a GPS signal) transmitted by pseudo-noise encoding from a GPS satellite orbiting above the earth (hereinafter also referred to as a satellite) is received, and the GPS signal is transmitted to the ground. Recently, a GPS position detecting device which decodes time of arrival, time information included in a GPS signal and a navigation message to accurately determine position information on the earth has been developed.

In such a GPS position detecting device, it is necessary to capture at least four or more GPS satellites orbiting the visible space and decode the GPS signals. After the timing of the key code (C / A code) assigned to each satellite is demodulated and demodulated with the noise-encoded high-frequency radio wave, the navigation message is decoded and collected.

[0004] However, it takes a considerable amount of time for the GPS position detecting device to independently capture the orbiting satellite and to decode the captured GPS signal. Therefore, recently, information such as clock frequency and Doppler frequency (GPS positioning assist information) in addition to satellite orbit information (ephemeris), approximate time and approximate location on the ground, and GPS
Attempts have been made to speed up the positioning of the GPS in the GPS position detecting device by providing the information via a wireless network from the positioning assist server.

[0005]

However, in the above-described conventional GPS position detection system, after the GPS device is activated, the validity of the ephemeris data and the like is checked internally, and if necessary, the GPS assist server is connected to the network via the network. Since ephemeris data or the like is received, communication costs between the servers are required, and the validity of the ephemeris data or the like is determined for the first time at the time of positioning.

The present invention has been made in view of such circumstances, and the owner of the GPS position detecting device can always obtain the latest valid GPS assist information without any communication cost. GPS position detecting device and GP
It is intended to provide an S position detection system.

[0007]

In order to achieve the above object, a GPS position detecting device according to claim 1 of the present invention comprises:
A voice call processing unit for calling the call terminal, performing a two-way voice call with the called communication terminal, and a G transmitted from a GPS assist server connected to a communication network.
A GPS positioning calculation processing unit for processing the PS assist data, and a voice / data processing unit for sorting packet data including a voice signal for a call and packet data including the GPS assist data, GPS
The positioning calculation processing unit performs voice / voice communication during a call with the call terminal.
The configuration is such that the GPS assist data extracted by the data processing unit is received and stored and updated periodically in the memory.

According to a second aspect, in the first aspect, the GPS
The assist data includes, in addition to the orbit information of the GPS satellites such as ephemeris, the position information of the wireless base station, the approximate time, the G
It includes assist data such as PS position correction information for speeding up GPS positioning.

According to a third aspect, in any one of the first and second aspects, the GPS positioning operation processing unit calls the telephone terminal,
During a call, the validity of the GPS assist data stored in the memory is determined at that time, and only when it is determined that the GPS assist data is not valid, a request for transmitting the GPS assist data to the GPS assist server is made. The transmitted GPS assist data is received and stored and updated in the memory.

[0010] In the GPS position detecting system according to the fourth aspect, the GPS position detecting device according to the first to third aspects,
A GPS assist data request setting unit is further provided, and when the GPS assist prohibition mode is selected by the request setting unit, the GPS assist data is set when the call terminal is called.
The transmission request to the PS assist server is prohibited.

According to a fifth aspect of the present invention, in the fourth aspect, the GPS
The position detecting device can control the GPS assist data even if the GPS assist data request setting unit selects the GPS assist prohibition mode.
When a positioning command is received, the positioning command is released and a transmission request to the GPS assist server is made possible.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of the GPS position detection system. GP
The S position detecting device 1 has a function of performing a two-way call and data communication with the call terminal 3a and the GPS assist server 2 connected to the communication network via the wireless base station 5.

The GPS position detecting device 1 has a G for processing GPS assist data transmitted from a GPS assist server 2 connected to a communication network.
PS positioning operation processing section 1a, wireless communication section 1b for communicating with wireless base station 5, call of call terminal 3a, and voice call processing for making a two-way voice call with called communication terminal 3a. And a voice / data processing unit 1d for sorting packet data containing a voice signal for a call and packet data containing GPS assist data. Note that the GPS assist server 2 receives satellite data periodically and stores the latest assist data.

The GPS positioning operation processing section 1a
The GPS assist data extracted by the voice / data processing unit 1d at the time of a telephone call with a is received and periodically updated in the memory. As a result, the GPS assist data 2a can be acquired during a call, so that it is not necessary to call the GPS assist server 2 just to obtain the GPS assist data 2a, and the communication cost is not required accordingly. Further, in the GPS position detection device 1, since valid GPS assist data is always stored, highly sensitive position positioning can be realized at high speed.

A calling command for the calling terminal 3a and a voice signal for talking are digitized by the voice / data processing unit 1d, converted into a packet signal (voice packet), and transmitted / received according to a predetermined protocol.

The voice call processing section 1c converts the voice input from the microphone into a voice signal, and converts the voice / data processing section 1c.
The audio signal separated from d is output as audio through a speaker. The voice packet includes a call command for calling the communication terminal 3a and a digitized voice signal.

The data packet includes a call command for the GPS assist server 2 and a control command necessary for transmitting and receiving data to and from the GPS assist server 2.
It includes GPS assist data, communication terminal and GP
It is transmitted to and received from the S assist server 2 according to a predetermined protocol.

In such a system, the communication terminal 1 sends a voice packet to call a specific call center, and after the partner terminal 3a responds to the call, the voice packet generated by the voice / data processing unit 1d. Is transmitted preferentially, and the data packet is interrupted and transmitted in the meantime.

In the called communication terminal 3a, the voice input through the microphone in response to the call of the communication terminal 1 is collected as voice packets by the voice / data processing unit, and the router 4 accesses the network. Is returned to the communication terminal 1.

After receiving the call from the communication terminal 1, the server 2 follows the communication terminal 1 according to a predetermined protocol.
In the communication terminal 1 that has received the GPS assist data as a data packet, the data is identified by the voice / data processing unit 1d and used by the GPS positioning calculation processing unit 1a for GPS positioning.

In such a system, a voice signal for a call is quickly transmitted and received in the form of a packet signal, and a GPS signal is transmitted.
Since the assist data can be transmitted as a data packet interrupted by a different protocol in the meantime, the GPS assist data can be received during the call.

Voice packets for speech do not like delays, so if there is an error in the middle, they will be skipped. However, if an error occurs during the communication, the GPS assist data must be retransmitted. Can be.

The GPS assist data 2a includes, in addition to orbit information of GPS satellites such as ephemeris,
GP such as location information, approximate time, GPS position correction information, etc.
Assist data for speeding up S positioning is included.

Further, the GPS positioning calculation processing section 1a calls the communication terminal 3a and determines whether the GPS assist data stored in the memory is valid at that time during the telephone call and determines that the data is not valid. GP only when
GPS assist data 2a for S assist server 2
, The received GPS assist data 2a can be received, and stored and updated in the memory.

That is, the GPS stored in the memory
If the assist data 2a is valid at that time, it is used as valid assist data for GPS positioning, but otherwise, the latest GPS assist data 2a is requested to be transmitted.

The GPS position detecting device 1 further includes a GPS assist data request setting unit. When the GPS assist prohibition mode is selected by the request setting unit, the GPS assist server requests a GPS assist server when calling the telephone terminal 3a. The request for transmission to No. 2 is prohibited. That is, GPS
When the position detecting device 1 is not an emergency call terminal, the GPS
The calling of the assist server 2 can be prohibited.

Even if the GPS assist data request setting means selects the GPS assist prohibition mode, the GPS
When receiving the S positioning command, release it and
A transmission request to the assist server 2 can also be enabled. That is, even if the GPS assist prohibition mode is selected, the prohibition mode can be automatically canceled when a GPS positioning command is received.

Next, the operation of the GPS position detecting system will be described in detail. Here, an Internet telephone (Voice over IP: VoIP) is used as a communication means, and is connected to a call center via a VoIP gateway 3 and further to a wireless base station 5 via a router 4.

First, a call is made from the GPS position detecting device 1 (emergency call terminal) to the call center. The voice / data processing unit 1d (VoIP gateway processing unit) digitizes a user's voice analog signal and converts it into a UDP / UDP signal.
It transmits to the call center side using the IP protocol. At this time, an IP address is acquired using a conversion table of the telephone number and the IP address.

Next, the call center side receives an emergency call from the GPS position detecting device 1. The voice data transmitted from the device 1 is transmitted to the VoIP gateway 3 in the call center.
As a result, the UDP / IP protocol data is converted into an analog audio signal. Since the gateway 3 has the conversion table of the IP address and the telephone number, the determination as to which telephone is to be made is made by referring to the table.

During a call, ephemeris data 2a and the like are transmitted from the GPS assist server 2 to the GPS position detecting device 1. The device 1 having sensed the emergency call event calculates the validity of the ephemeris data by the GPS positioning operation processing unit 1a at the same time as making a call to the call center. It requests ephemeris data from the server 2. The requested GPS assist server 2 calculates and transmits ephemeris data suitable for the device 1. GPS
The ephemeris data is transmitted and received between the position detection device 1 and the GPS assist server 2 using a positioning protocol.

The GPS positioning calculation processing unit 1a that has received the ephemeris data performs positioning based on the data. Then, the position of the user can be grasped by notifying the data measured by the GPS positioning calculation processing section 1a to the call center. Therefore, it is possible to grasp the position of the user while talking with the operator of the call center.

That is, the voice data is subjected to digital signal processing by the VoIP gateway 3 to be converted into packet data of the UDP protocol. Therefore, data between the center and the GPS position detecting device 1 is delivered by the existing Internet protocol. Therefore, the network between the center and the GPS position detecting device 1 is suitable for data delivery, not for voice signals.

In VoIP, since the data to be handled is voice, it is devised to minimize the delay. Therefore, a protocol that is faster in processing than a protocol that delivers GPS assist data is used.
To that extent, since retransmission processing is not performed, quality is sacrificed in terms of data loss during communication. The VoIP gateway 3 is also provided with a function of transmitting packets including voice data with priority. On the other hand, G
The protocol for delivering PS assist data is equipped with a highly reliable communication function in which a retransmission procedure is also established.

Voice data and GPS assist data are delivered from the center to the GPS position detecting device 1. However, the audio data is preferentially delivered using a protocol that is faster in order to reduce delay.

At the time of reception, the data received by the GPS position detecting device 1 cannot be distinguished from voice or GPS assist data. , Packet data obtained by converting audio data. The GPS assist data is output to the GPS positioning calculation processing section 1a as it is. On the other hand, the packet data obtained by converting the audio data is thereafter converted into an audio signal and output from the speaker.

FIG. 2 is a block diagram showing the internal configuration of the GPS position detecting device 1. Here, details of the GPS positioning calculation processing section 1a are mainly shown. The GPS position detecting device 1 receives a high-frequency radio wave from a GPS satellite via an antenna and converts it into a digital intermediate frequency, a satellite signal acquisition process for performing a channel search in consideration of the Doppler effect, and Signal processing unit 11 for performing satellite signal tracking processing for sequentially tracking and demodulating navigation messages, and measuring unit 12 for measuring a pseudo distance to a satellite
And a data decryption unit 13 for decrypting the message data sequence
A satellite position calculator 14 for calculating a satellite position based on satellite orbit information (ephemeris), a positioning calculator 15 for calculating latitude and longitude based on a satellite position and a pseudo distance, a rough time and a rough terminal position. An internal memory and clock 16 for storing general satellite orbit information, and satellite orbit information from the server 2;
A terrestrial communication transmitting / receiving unit 17 for receiving an approximate time, a terminal approximate position, map information, and the like, a strategy determining unit 18 for setting a satellite signal search strategy of a satellite to be captured, and a memory 19 for storing and updating GPS assist data. .

The GPS assist server 2 has a GP
An S receiving device 20 and a terrestrial communication transmitting / receiving unit 21 are provided,
The satellite orbit information (ephemeris) and the like are transmitted to the GPS position detecting device 1 via the wireless network N. As described above, since the GPS position detecting device 1 receives the latest accurate orbit information of the satellite, the time required for tracking the satellite is reduced, and positioning is performed quickly.

[0039]

As can be understood from the above description, the GPS position detecting device according to the first aspect of the present invention receives GPS assist data extracted during a call with a call terminal, and stores the data in the memory. Since the storage is updated periodically, it is not necessary to call the GPS assist server only to obtain the GPS assist data, and the communication cost is not required accordingly. Further, in the GPS position detecting device, since valid GPS assist data is always stored, highly sensitive position positioning can be realized at high speed.

According to the second aspect, the GPS assist data is:
Since the position information of the wireless base station, the approximate time, the GPS position correction information, and the like are included in addition to the orbit information of the GPS satellites such as ephemeris, the speed of the GPS positioning can be increased.

According to a third aspect of the present invention, the validity of the GPS assist data stored in the memory at that time is determined during a call to the telephone terminal and during a telephone call. Since a request for transmitting GPS assist data to the assist server is made, the transmitted GPS assist data is received, and stored and updated in the memory, unnecessary communication is not required.

In the GPS position detecting system according to the fourth aspect, when the GPS assist prohibition mode is selected, a transmission request to the GPS assist server is prohibited when the calling terminal is called, so that useless communication is not performed. I can do it.

According to the fifth aspect, even when the GPS assist prohibition mode is selected, if a GPS positioning command is received,
This can be automatically canceled to enable a transmission request to the GPS assist server.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of the configuration of a GPS position detection system according to the present invention.

FIG. 2 is a block diagram illustrating an example of a configuration of a GPS position detecting device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 GPS position detecting device 1a GPS positioning calculation processing unit 1b Wireless communication unit 1c Voice call processing unit 1d Voice / data processing unit 19 Memory 2 GPS assist server 5 Radio base station

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Junichi Suzuki 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works, Ltd. Inventor Takuya Sueto 1048 Kadoma Kadoma, Kadoma City, Osaka Pref. (72) Inventor Masahito Fukuda 1048 Kadoma Kadoma, Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. 1048 Kadoma Matsushita Electric Works Co., Ltd. (72) Inventor Kenji Okuno 1048 Kadoma Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. 72) Inventor Kazuhiro Kawamoto 1048 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. 5J062 AA01 AA08 BB05 CC07 DD23 EE03 EE05 FF01

Claims (5)

[Claims] 1. A GPS position detecting device having a function of performing a two-way call and data communication between a call terminal connected to a communication network and a GPS assist server via a wireless base station, comprising: a GPS position detecting device; A voice call processing unit for calling a calling terminal, making a two-way voice call with the called communication terminal, and processing GPS assist data sent from a GPS assist server connected on a communication network. GPS positioning calculation processing unit, packet data including a voice signal for a call, and GP
A voice / data processing unit that sorts packet data including S assist data; and wherein the GPS positioning calculation processing unit is configured to output the GP extracted by the voice / data processing unit during a call with the call terminal.
A GPS position detecting device configured to receive S-assist data and periodically store and update the data in a memory. 2. The method according to claim 1, wherein the GPS assist data is a GP such as ephemeris.
A GPS position detecting device that includes assist data for speeding up GPS positioning, such as position information of a radio base station, approximate time, and GPS position correction information, in addition to the orbit information of the S satellite. 3. The method according to claim 1, wherein the GPS positioning operation processing unit calls the communication terminal,
While talking, the GPS stored in the memory
Judging the validity of the assist data at that time,
Only when it is determined that the GPS assist server is not valid, a request for transmitting GPS assist data to the GPS assist server is made, the transmitted GPS assist data is received, and stored and updated in the memory. apparatus. 4. The GPS position detecting device according to claim 1, further comprising: a GPS assist data request setting unit, wherein when the GPS assist prohibition mode is selected by the request setting unit, the GPS communication is performed. When calling the terminal, G
A GPS position detection system configured to prohibit a transmission request to a PS assist server. 5. The GPS position detection device according to claim 4, wherein the GPS position detection device cancels the GPS assist data request even if the GPS assist data request setting means selects the GPS assist prohibition mode when the GPS position detection command is received. And a GPS position detection system configured to enable a transmission request to the GPS assist server.