Method and system for obtaining GPS standard time by terminal in synchronous communication system

A standard time and synchronization system technology, applied in the communication between multiple stations, radio wave measurement system, wireless communication, etc., can solve the problems of inaccuracy and rough time

Active Publication Date: 2009-04-01
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the GPS standard time obtained in the current A-GPS is mostly rough and not accurate enough

Method used

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  • Method and system for obtaining GPS standard time by terminal in synchronous communication system
  • Method and system for obtaining GPS standard time by terminal in synchronous communication system
  • Method and system for obtaining GPS standard time by terminal in synchronous communication system

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Embodiment Construction

[0059] see Figure 4 ~ Figure 6 As shown, the system of the present invention includes at least one mobile terminal 100 with A-GPS function, a communication network 200 and a SUPL positioning platform 300 . The system can also include a positioning application platform 400, which completes the connection function of positioning services and other external servers, provides external location information of mobile terminals that need positioning, and provides signaling such as positioning requests and positioning completion to the positioning platform. Among them, SUPL positioning platform 300 can be according to Figure 1 ~ Figure 3 The SUPL positioning method shown realizes positioning information transmission.

[0060] The SUPL positioning platform 300 has a GPS receiver 302 , a synchronous communication system terminal receiver 304 , a computing unit 306 and a positioning server 308 inside. The GPS receiver 302 can demodulate GPS satellite information to obtain GPS standar...

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Abstract

The invention discloses a method of acquiring GPS standard time at terminals of a synchronous communication system and a system, comprising: acquiring absolute GPS standard time of a synchronous system clock by an SDPL positioning platform when determining system frame number; executing SUPL flow to perform positioning operation between the SUPL positioning platform and the mobile terminal, when at the starting moment of exchanging the positioning data, the SUPL positioning platform transmits the GPS standard time to the mobile terminal; computing the current GPS standard time according to the current system frame number and the absolute standard time by the mobile terminal. Due to synchronous characteristics between the base station of the synchronous communication system, the invention acquires correct GPS standard time.

Description

technical field [0001] The invention relates to a method and a system for a terminal to obtain GPS standard time in a synchronous communication system. Background technique [0002] GPS is a satellite-based positioning system that was originally designed and controlled by the U.S. military and is free for anyone to use. This system is composed of 24 satellites operating in 6 intermediate circular orbits, and the time for one satellite to circle the orbit is close to 12 hours. Each satellite is constantly sending information about the current time, the positions of all satellites, and some related data like almanac and ephemeris. A GPS receiver uses this information to calculate the distance between itself and the satellites. To determine position, a GPS receiver must receive signals from at least four satellites. [0003] Time to First Fix (TTFF) characterizes the time required for the first positioning of the GPS receiver. TTFF largely depends on the receiving sensitivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00H04B7/26G01S5/02
Inventor 吴涛
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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