JP2002221565A - 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 GPS position detection device 1 is equipped with a GPS positioning operation control part 1b. The GPS positioning operation control part 1b has a constitution for receiving GPS positioning assist information transmitted periodically from a radio base station 5 by utilizing a control channel, and re-memorizing the information 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 bidirectional communication with 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 GPS positioning calculation control unit that receives GPS positioning assistance information transmitted periodically using a control channel from the wireless base station and periodically stores the information in a memory; It is configured to be updated.

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

According to a third aspect of the present invention, there is provided a GPS position detecting system having a communication function,
And a wireless base station connected to the S position detecting device through a two-way communication channel configured by a control channel and a communication channel. The wireless base station includes GPS positioning assist information. Is regularly transmitted as a control channel,
The GPS position detection device is configured to receive the GPS positioning assist information extracted by demodulating the carrier and store and update the information in the memory.

In a fourth aspect, in the third aspect, the wireless base station is connected to a GPS positioning assist server via a communication network, and uses the GPS positioning assist information provided from the server as a control channel. ,
The feature is that it is transmitted periodically.

According to a fifth aspect of the present invention, in any one of the third and fourth aspects, the GPS positioning assist information includes, in addition to orbit information of a GPS satellite such as ephemeris, position information of a radio base station, approximate time, and GPS position correction information. And assist information for speeding up GPS positioning.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of a GPS position detecting system. This GPS position detecting system includes a GPS position detecting device 1 having a communication function and a control channel between the GPS position detecting device 1 and a control channel. And a wireless base station 5 connected through a two-way communication channel formed by a communication channel.

The GPS position detecting device 1 as a mobile terminal includes:
It has a function of performing two-way communication such as a telephone call and data communication with a communication terminal connected to the network via the wireless base station 5, and further connects to the GPS positioning assist server 2 via the mobile phone network. Have been. Communication between the GPS positioning assist server 2 and the GPS position detecting device 1 is performed via the gateway control station 3, the telephone control station 4, and the radio base station 5, and the GPS provided by the GPS positioning assist server 2 The assist information 2a is transmitted to the GPS position detecting device 1 using a control channel.

The GPS position detecting device 1 includes a wireless communication unit 1a for performing wireless communication with the GPS positioning assist server 2.
, A GPS positioning calculation control unit 1b for detecting its own position, and a voice call processing unit 1c for making a voice call.

The GPS positioning calculation control section 1b receives GPS positioning assist information transmitted periodically using the control channel from the radio base station 5, and periodically stores and updates the information in the memory. The GPS positioning assist information includes assist information for speeding up the GPS positioning, such as the position information of the wireless base station 5, the approximate time, and the GPS position correction information, in addition to the orbit information of the GPS satellites such as ephemeris. .

As described above, in the GPS position detecting device 1,
Since the GPS positioning assist information is received using the control channel even when a call or the like is not being performed, quick position detection can be performed without incurring communication costs. In addition, since effective assist information is always stored, highly sensitive position positioning can be realized at high speed.

The radio base station 5 periodically transmits a carrier modulated by the GPS positioning assist information as a control channel, and the GPS position detecting device 1 demodulates the carrier and extracts the GPS positioning assist information. The received data is stored and updated in the memory. The wireless base station 5
It is connected to the GPS positioning assist server 2 via the communication network, and receives the GP provided from this server.
The S positioning assist information is periodically transmitted as a control channel.

FIG. 2 is a block diagram showing the internal configuration of the GPS position detecting device 1. Here, details of the GPS positioning calculation control unit 1b 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 the approximate time, the approximate position of the terminal, map information, and the like; a strategy determining unit 18 for setting a satellite signal search strategy for a satellite to be captured; Prepare.

On one GPS positioning assist server 2,
A GPS receiving device 20 and a terrestrial communication transmitting / receiving unit 21 are provided to transmit satellite orbit information (ephemeris) and the like 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.

[0020]

As can be understood from the above description, in the GPS position detecting apparatus according to each of the first and second aspects of the present invention, a signal is transmitted periodically from a radio base station using a control channel. Since the GPS positioning assist information is received, quick position detection can be performed without communication cost.
In addition, since effective assist information is always stored, highly sensitive position positioning can be realized at high speed.

In particular, in claim 2, the GPS positioning assist information includes data such as position information of the radio base station, approximate time, and GPS position correction information in addition to the orbit information of the GPS satellites such as ephemeris. And speeding up GPS positioning.

The GPS according to each of claims 3 to 5
In the position detection system, the radio base station periodically transmits a carrier modulated with the GPS positioning assist information as a control channel, and the GPS position detecting device demodulates the carrier and extracts the GPS positioning assist information. Since reception is performed, quick position detection can be performed without incurring communication costs. In addition, since effective assist information is always stored, highly sensitive position positioning can be realized at high speed.

In particular, in claim 4, the radio base station is a
Since the GPS positioning assist information provided from the S positioning assist server is periodically transmitted as a control channel, the GPS position detecting device can quickly detect a position without incurring a communication cost.

According to a fifth aspect of the present invention, the GPS positioning assist information includes data such as position information of the radio base station, approximate time, and GPS position correction information in addition to the orbit information of GPS satellites such as ephemeris. GPS positioning can be speeded up.

[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 1b GPS positioning calculation control unit 19 Memory 2 GPS positioning assist server 5 Wireless base station

Continuing from the front page (72) Inventor Junichi Suzuki 1048 Kadoma Kadoma, Kazuma, Osaka Matsushita Electric Works, Ltd. (72) Inventor Wakio Yamada 1048 Kadoma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor Takuya Sueto 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture (72) Inventor Masahito Fukuda 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. Matsushita Electric Works Co., Ltd. (72) Inventor Kenji Okuno, Osaka, Kadoma City, Oji 1048, Matsushita Electric Works Co., Ltd. Person Kazuhiro Kawamoto 1048 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Works F-term (reference) 5J062 AA02 AA08 AA13 BB05 CC07 DD05 5K067 DD20 EE10 FF03 GG11 HH23 JJ52 JJ56

Claims (5)

[Claims] 1. A GPS position detecting device having a function of performing two-way communication with a radio base station, wherein the GPS position detecting device includes a GPS positioning operation control unit. A GPS position detecting device configured to receive GPS positioning assist information transmitted periodically using a control channel from the wireless base station, and to periodically store and update the information in a memory. 2. The GPS positioning assist information according to claim 1, wherein the GPS positioning assist information is
In addition to the orbit information of the PS satellite, the position information of the radio base station,
A GPS position detecting device including assist information for speeding up GPS positioning, such as approximate time and GPS position correction information. 3. A GPS position detecting device having a communication function,
A GPS position detection system comprising at least a radio base station connected to the GPS position detection device through a two-way communication channel formed of a control channel and a communication channel, Periodically transmits a carrier containing GPS positioning assist information as a control channel. The GPS position detecting device receives the GPS positioning assist information extracted by demodulating the carrier, and updates the information stored in the memory. A GPS position detecting device having a configuration for causing the GPS position to be detected. 4. The radio base station according to claim 3, wherein the radio base station is connected to a GPS via a communication network.
G is connected to a positioning assist server, and periodically transmits GPS positioning assist information provided from the server as a control channel.
PS position detection system. 5. The GPS positioning assist information according to claim 3, wherein the GPS positioning assist information is
In addition to the orbit information of the PS satellite, the position information of the radio base station,
A GPS position detection system including assist information for speeding up GPS positioning, such as approximate time and GPS position correction information.