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Method and system for updating global position system (GPS) ephemeris fast and reliably

A GPS module and ephemeris technology, applied in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices and other directions, can solve the problems of inability to perform fast positioning and inability to obtain GPS ephemeris, and achieve shortening TTFF time and fast speed. The effect of positioning

Active Publication Date: 2014-12-17
ZHEJIANG UNIV
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  • Claims
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Problems solved by technology

The validity period of the ephemeris data is only a few hours. When the traditional ephemeris server is disconnected from the GPS root ephemeris server, each A-GPS terminal host cannot obtain the latest GPS ephemeris and cannot perform rapid positioning.

Method used

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  • Method and system for updating global position system (GPS) ephemeris fast and reliably
  • Method and system for updating global position system (GPS) ephemeris fast and reliably
  • Method and system for updating global position system (GPS) ephemeris fast and reliably

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Embodiment Construction

[0040] The specific embodiment of the present invention is described below in conjunction with accompanying drawing

[0041] figure 1 Schematic diagram of the updating system for GPS ephemeris data. The GPS ephemeris updating system actually includes an A-GPS terminal host 6 and a local GPS ephemeris server 2 . There can be many A-GPS terminal hosts, and there is only one local GPS ephemeris server. The local GPS ephemeris server contains a virtual GPS ephemeris generation module 1 inside. The local GPS ephemeris server is connected to the Internet, and obtains the latest ephemeris data from each GPS root ephemeris server3,4,5,7. When the local GPS ephemeris server is disconnected from each GPS root ephemeris server, the internal ephemeris data source will immediately switch to the internal virtual GPS ephemeris generation module. The virtual GPS ephemeris generation module can calculate the connection value based on the previously obtained satellite ephemeris and through th...

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Abstract

The invention relates to a method and system for updating a global position system (GPS) ephemeris fast and reliably. According to the method and system for updating the GPS ephemeris fast and reliably, a local GPS ephemeris server is established, and a virtual GPS ephemeris generating module is arranged inside the local GPS ephemeris server. Normally the local GPS ephemeris server acquires ephemeris data from a GPS official ephemeris server. When the local GPS ephemeris server is disconnected with the GPS official ephemeris server, the virtual GPS ephemeris generating module starts to work to generate an accurate virtual ephemeris, and GPS ephemeris data in the local GPS ephemeris server are instantly switched into internal virtual GPS ephemeris data to guarantee continuity and reliability of the GPS ephemeris data. According to the method and system for updating the GPS ephemeris fast and reliably, the time to first fix (TTFF) of a host computer of each A-GPS terminal is shorten obviously, the TTFF of a positioning system of each A-GPS terminal can be shortened to less than 20 seconds after cold start, and therefore fast and reliable positioning is achieved.

Description

technical field [0001] The invention relates to a method and system for quickly and reliably updating GPS ephemeris. Background technique [0002] When the application of GPS continues to promote personal portable applications, the traditional GPS positioning method has a considerable bottleneck in its use. A stand-alone GPS device using Autonomous Positioning must receive more than four satellite signals in an open sky with good signal conditions, and the GPS receiver of this device must also complete the orbit information data of these GPS satellites. Collect all, and then the positioning calculation can be performed. [0003] The start-up positioning time after the GPS receiver is turned on for the first time depends on the start-up method, which can generally be divided into three types: cold start, warm start and hot start: [0004] Cold Start: The GPS receiver has cleared all historical data, or the GPS receiver has moved more than 1000km without power on, and the GP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/25G01S19/27
Inventor 黄琦潘策荣杜锐周洪杰
Owner ZHEJIANG UNIV
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