Ethnic code capture method and ethnic code capture device

Abstract

The invention discloses an ethnic code capture method and an ethnic code capture device. The ethnic code capture method comprises the following steps: extracting baseband signals to obtain to-be-processed baseband data, and storing by child segments; respectively performing partial matched filtering (PMF) on all the child segments by taking a local pseudo code as a tap coefficient to obtain accumulation results to complete code phase search; caching the PMF processed results, respectively performing fast Fourier transform (FFT) on the results, and performing spectral analysis to complete frequency search; respectively performing parallel delivery on FFT processed output results, and then, accumulating by points to obtain M-point incoherent accumulation results, and looking up capture results, wherein the capture results can include but are not limited to a maximum correlation value, a secondary correlation value, frequency, a phase, the number of segments, and the like. According to the ethnic code capture method and the ethnic code capture device disclosed by the invention, by adopting a mode of PMF and FFT combination, the sensitivity of ethnic code capture is improved, and the rapid capture of an ethnic code is completed in an FPGA (field programmable gate array) chip, and moreover, the ethnic code capture device can be bound with a receiver channel, and under the condition that high sensitivity is met, the capture speed is remarkably improved, and therefore, the requirement of practical application is met.

Description

technical field [0001] The invention relates to satellite navigation technology, in particular to a civil code acquisition method and device. Background technique [0002] Satellite navigation receivers used in vehicles and other environments do not have high dynamic requirements, but have higher sensitivity requirements than ordinary receivers. As the first step in the normal operation of the receiver, the fast capture engine has become a top priority to improve the capture sensitivity and speed up the capture. [0003] The Beidou satellite navigation system adopts QPSK modulation and the general long coherent integration acquisition method. Due to the influence of high-speed data flipping, the acquisition success rate is reduced, which cannot meet the requirements of practical applications. In addition, in the general civilian code acquisition method, the use of The way of matched filter or cycle-related capture mode, the capture speed is too slow to meet the requirements...

AI Technical Summary

Problems solved by technology

[0003] The Beidou satellite navigation system adopts QPSK modulation and the general long coherent integration acquisition method. Due to the influence of high-speed data flipping, the acquisition success rate is reduced, which cannot meet the requirements of practical applications. In addition, in the general civilian code acquisition method, the use of The way of matched filter or cycle-related capture mode, the capture speed is too slow to meet the requirements of fast capture

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