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Method for acquiring pseudo code of GNSS signal

A pseudo-code and signal technology, applied in the field of satellite navigation, can solve the problems of weakening the correlation of pseudo-code sequences, weakening the correlation peak, unfavorable for GNSS signal acquisition, etc. The effect of recapture

Inactive Publication Date: 2011-08-17
BEIHANG UNIV
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Problems solved by technology

However, after these methods are processed, the correlation of the pseudocode sequence in GNSS is weakened, and the correlation peak is weakened, which is not conducive to the capture of GNSS signals

Method used

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  • Method for acquiring pseudo code of GNSS signal
  • Method for acquiring pseudo code of GNSS signal

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Embodiment 1

[0088] Embodiment 1 The specific implementation method of the present invention will be described below by taking the acquisition of GPS L1 signal coarse acquisition code (Coarse / Acquisition code, C / A code for short) as an example.

[0089] Because the cycle of the C / A code is 1ms, the sampling frequency f of the GPS receiver is s If it is 5MHz, there are 5000 sampling points in each GPS C / A code cycle. If the correlation integration period is 1 C / A code period, then 5000 points of DFT and IDFT need to be carried out in the steps of the method of the present invention, and the decomposition structure of 5000 points of DFT / IDFT is as attached image 3 shown.

[0090] Among them, the first layer can be decomposed into 125×40(N 1 =125,N 2 =40), such as formula (8), adopt Cooley-TukeyFFT to carry out DFT operation of 5000 points. First calculate the index transformation of the input sequence according to formula (2); then calculate 40 DFTs of length 125 points; then apply the ...

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Abstract

The invention discloses a method for acquiring a pseudo code of a GNSS signal, which is mainly suitable for acquiring the code of a conventional ranging code signal in a GNSS receiver. The method comprehensive uses a Winograd Fourier transform algorithm, a prime factor algorithm PFA and a Cooley-Tukey FFT algorithm to perform discrete Fourier transform DFT and inverse discrete Fourier transform IDFT, thereby simplifying time domain-related algorithms by using a DFT and IDFT group calculation and completing the related acquisition of the pseudo code of the GNSS signal. The method of the invention belongs to a code parallel frequency domain acquisition method which has fast acquisition and is advantageous over the conventional time-domain acquisition method in software and hardware resourceconsumption; and meanwhile, due to the characteristic of the combination of the WFTA, PFA and Cooley-Tukey FFT algorithms, the method can perform the DFT and IDFT calculation of all sampling points ofthe sequence of the pseudo code and retains the related characteristics of the sequence of the pseudo code, thereby achieving an acquisition performance better than that of a classic double sampling-based fast Fourier transform FFT acquisition method.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to a method for acquiring pseudo-codes of GNSS signals. Background technique [0002] The Global Navigation Satellite System (GNSS for short) has become one of the fastest-growing information industries in the world. It is global, all-weather, continuous and real-time, and can provide users with positioning, speed measurement and timing services Serve. Because GNSS plays a vital role in both military and civilian applications, more subsystems belonging to the GNSS system are being designed, constructed and used. [0003] Among them, the navigation messages of modern satellite navigation systems using spread-spectrum ranging codes such as GPS, Beidou II, Galileo, etc., modulate the pseudo-random code and carrier twice in the form of data, form radio waves and continuously transmit them to the ground. The user intercepts the satellite signals within the field of visio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/02G01S5/02
Inventor 张晓林李春宇张强
Owner BEIHANG UNIV