Method and system for global position system (GPS) signal capture

A GPS signal and signal acquisition technology, applied in the field of GPS weak signal acquisition, can solve the problems of Doppler frequency related power loss, chip rate impact, related power loss, etc., to improve related power loss, efficient and fast acquisition, weakening The effect of power loss

Inactive Publication Date: 2012-09-12
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, when the relative speed between the receiver and the GPS satellite is high, the GPS signal received by the receiver will produce a large Doppler frequency shift, and under long-time integration, the Doppler frequency shift will have a great impact on the chip rate , causing the code period to be inaccurate, and there is a related power loss when using FFT for circular convolution; differential coherent acquisition will also cause a r

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  • Method and system for global position system (GPS) signal capture
  • Method and system for global position system (GPS) signal capture
  • Method and system for global position system (GPS) signal capture

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[0038] A kind of GPS signal acquisition method of the present invention, as figure 1 shown, including the following steps:

[0039] Step 1: Down-convert and sample the GPS analog signal transmitted by the satellite, and set the appropriate initial value and maximum value of the Doppler frequency shift variable, that is, set the Doppler frequency shift search range, and set the Doppler frequency shift at the same time. Shift search interval, detection threshold, initial value of satellite number variable and maximum value of satellite number.

[0040] In the present invention, the search range of the Doppler frequency shift is -10KHz˜10KHz. The search interval of the Doppler frequency shift is 250Hz-500Hz. The detection threshold refers to the MTM detection threshold, where MTM represents the ratio of the maximum correlation value to the correlation mean value, if the calculated MTM exceeds the detection threshold B T That is, the signal is considered to be accurately captur...

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Abstract

The invention discloses a method and a system for global position system (GPS) signal capture, which organically combine fast Fourier transformation (FFT), double block zero padding (DBZP), differential coherence, frequency difference correction and other techniques, can achieve efficient and fast GPS signal capture and can reduce related power loss caused by chip speed change due to large doppler frequency shift in a fast Fourier transformation calculating process. In addition, power loss caused by residual doppler frequency shift errors can be reduced through the frequency difference correction technique, and efficient and fast capture is achieved.

Description

technical field [0001] The invention relates to the field of GPS (Global Position System, Global Positioning System) weak signal capture, in particular to a GPS signal capture method and system. Background technique [0002] At present, GPS has been widely used all over the world, but most of them are in environments with ideal signal conditions. When the signal conditions are not ideal, such as indoors, forests, and cities, where phenomena such as occlusion, multipath, and interference are serious, GPS cannot be used well. And these environments are the main places of human activities. There are many important GPS application requirements in these environments. High-performance GPS satellite navigation receivers are produced to meet this requirement, and have become the main research direction in the navigation field. The high-sensitivity acquisition algorithm of GPS signals is at the forefront of GPS receiver baseband signal processing, and is the key to improving the per...

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Application Information

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IPC IPC(8): G01S19/24
Inventor 张顺岚莫建文欧阳宁张彤首照宇袁华
Owner GUILIN UNIV OF ELECTRONIC TECH
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