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GPS positioning system, GPS positioning method, and GPS positioning terminal

A GPS positioning and terminal technology, applied in the field of GPS positioning systems, can solve the problems of deterioration of the freshness of GPS positioning information, no information about the current position, and no knowledge of the current position of the terminal, etc., and achieves excellent efficiency, high positioning accuracy, The effect of reducing the number of communications

Inactive Publication Date: 2012-05-23
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the positioning fails, it cannot be updated, and the freshness of the GPS positioning information deteriorates with the passage of time, and it is necessary to perform positioning again with a cold start
In addition, there is also the following problem: when the GPS positioning fails, no information about the current position can be obtained, and the current position of the terminal is completely unknown

Method used

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  • GPS positioning system, GPS positioning method, and GPS positioning terminal
  • GPS positioning system, GPS positioning method, and GPS positioning terminal
  • GPS positioning system, GPS positioning method, and GPS positioning terminal

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Embodiment Construction

[0036] Hereinafter, preferred embodiments of the GPS positioning system, GPS positioning method, and GPS positioning terminal according to the present invention will be described in detail with reference to the accompanying drawings. In addition, in the description of the drawings, the same reference numerals are assigned to the same elements, and overlapping descriptions are omitted.

[0037] (Overall structure of GPS positioning system 1)

[0038] First, refer to figure 1 The configuration of the GPS positioning system 1 according to the embodiment of the present invention will be described. figure 1 It is a schematic diagram of the structure of the GPS positioning system 1 . Such as figure 1 As shown, the GPS positioning system 1 is composed of a base station 10 (corresponding to the “server” in the claims) and a terminal 30 (corresponding to the “GPS positioning terminal” in the claims), and the base station 10 and the terminal 30 are connected to each other through the...

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Abstract

A GPS positioning system is provided with a storage unit (36) which stores assist data for GPS positioning therein, a determination unit (35) which determines whether stored assist data that is stored in the storage unit (36) is valid or invalid, an Autonomous positioning unit (33) which, when the stored assist data is determined to be valid, performs the GPS positioning on the basis of the stored assist data determined to be valid, without communication with a base station (10), an A-GPS positioning unit (32) which, when the stored assist data is determined to be invalid, performs the GPS positioning on the basis of assist data acquired by communication with the base station (10), and an updating unit (37) which, when the GPS positioning succeeds, updates the stored assist data on the basis of the result of the positioning, and when the GPS positioning fails, updates the stored assist data on the basis of the assist data acquired by communication with the base station (10).

Description

technical field [0001] The invention relates to a GPS positioning system, a GPS positioning method and a GPS positioning terminal. Background technique [0002] As a technique for performing GPS positioning (Global Positioning System) independently by a terminal, there is autonomous positioning. Autonomous positioning is used, for example, in a positioning device that does not have a communication function, such as a car navigation system, and is divided into a cold start (clod start) and a hot start (hot start). In cold start, without using GPS positioning information (such as information such as initial position, time, satellite orbit, etc.), information such as the orbit and time of the satellite is obtained by demodulating the signal received from the GPS satellite. Based on these information, For example, judge the distance between the satellite and the measurement site according to the time difference between outgoing and incoming calls and the speed of light, and car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/25G01S19/06G01S19/34H04W64/00
CPCG01S19/05H04W4/00
Inventor 高桥诚
Owner NTT DOCOMO INC
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