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A windowed fft satellite signal acquisition method

A satellite signal capture and signal-band technology, applied in the field of satellite signal capture with windowed FFT, can solve problems such as inability to adapt to satellite frequency points and long capture time, and achieve the effect of optimizing capture time and improving frequency resolution

Active Publication Date: 2022-01-21
成都华力创通科技有限公司
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to propose a satellite signal acquisition method with windowed FFT, to solve the problem that the satellite signal search algorithm in the traditional technology has a long acquisition time and cannot adapt to all satellite frequency points

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  • A windowed fft satellite signal acquisition method
  • A windowed fft satellite signal acquisition method

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Embodiment Construction

[0023] The invention aims to propose a satellite signal acquisition method with windowed FFT to solve the problems of long acquisition time and inability to adapt to all satellite frequency points in the satellite signal search algorithm in the traditional technology.

[0024] The present invention adopts the method of multi-channel parallel correlator plus FFT frequency estimation to perform fast search: the satellite baseband data is stored in FPGA internal RAM at 2 times the code rate, then read out at a high speed of 100MHz, and sent to the multi-channel parallel correlator. After the parallel correlator is segmented, the correlation value is stored in the ping-pong RAM and notified to the FFT module. The FFT module reads the segmental correlation value of each correlator and multiplies the window function. After FFT, the modulus is sent to the non-coherent accumulation RAM. The non-coherent Find the 5 maximum values ​​after the accumulation times are full. At this point, ...

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Abstract

The invention belongs to the field of satellite navigation, and discloses a satellite signal acquisition method with windowed FFT, which solves the problems of long acquisition time and inability to adapt to all satellite frequency points in the satellite signal search algorithm in the traditional technology. In the present invention, the satellite baseband data is stored in the internal RAM of the FPGA at a double code rate, read out at a high speed of 100MHz, and sent to a multi-channel parallel correlator. After the parallel correlator is segmented, the correlation value is stored in the ping-pong RAM and notified to the FFT module. The FFT module reads the segmental correlation value of each correlator and multiplies the window function. After FFT, the modulus is sent to the non-coherent accumulation RAM. Find the 5 maximum values ​​after the accumulation times are full. At this point, a large phase search is completed, and the satellite baseband data storage RAM read address is offset by a large phase, and the above steps are repeated to search for the next large phase until the specified large phase is searched.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to a satellite signal acquisition method with windowed FFT. Background technique [0002] Satellite navigation systems currently in use include American GPS, Russian GLONASS, European GALILEO, and Chinese Beidou system. To realize navigation, satellite radio frequency signals must be down-converted to intermediate frequency, rough tracking, fine tracking, and navigation message demodulation. The satellite signal acquisition method in the invention belongs to the rough tracking stage. [0003] Rough tracking is a two-dimensional search process for IF signals in the code phase domain (time domain) and Doppler domain (frequency domain), usually using algorithms such as circular correlation or partial matched filter + FFT. The circular correlation algorithm equates the parallel correlation operation in the time domain to the FFT+IFFT operation in the frequency domain; th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 陈建国李金全王绍新赵兰保
Owner 成都华力创通科技有限公司
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