Second-generation BeiDou B1 frequency band weak signal capturing method

A weak signal acquisition, Beidou technology, applied in the field of satellite communications, can solve problems such as affecting the acquisition performance of Beidou second-generation satellite B1 signals, low signal-to-noise ratio, and limiting the duration of coherent integration of B1 signals.

Active Publication Date: 2016-06-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In addition, due to reflection, diffraction and other factors that generate other interference signals, the received signal-to-noise is very low. Under the requirements of low signal-to-noise ratio and high sensitivity, the length of the signal used for correlation calculation must be increased. Unlike traditional GPS signals, Beidou satellite signals use The Neumann-Hoffman code (referred to as NH code) performs secondary code modulation, which brings challenges to the acquisition method of satellite signals while improving the cross-correlation performance. The modulation of NH code makes it possible to generate symbol bit jumps every 1 ms This limits the coherent integration duration of the B1 signal, which seriously affects the acquisition performance of the B1 signal of the second-generation Beidou satellite.

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[0050] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0051] Invented a "Beidou II" weak signal acquisition method in the B1 frequency band based on sparse Fourier transform. The main innovation is to use the local quantized pseudo-random code as a new pseudo-random code and perform multiple milliseconds with the received signal through secondary modulation of the NH code. In this way, the stripping of the NH code and the phase synchronization of the code are carried out simultaneously, which can realize the capture of weak signals. According to the sparsity of time-domain related signals, the present invention uses SFT to replace the traditional FFT process, which can greatly reduce the hardware resource overhead of the capture process and shorten the capture time. The combination of various advantages makes the present invention have fast, reliable and efficient performanc...

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Abstract

The invention belongs to the technical field of satellite communication and especially relates to a rapid high-efficiency signal capturing method for a BeiDou navigation satellite system (BDS). For second-generation BeiDou B1 frequency band weak signals, NH code secondary modulation is carried out on local quantified pseudo-random codes, multi-millisecond coherent integration is carried out on the pseudo-random codes and received signals, a frequency domain code phase searching algorithm based on SFT is realized, and the operation complexity and capturing time of the capturing algorithm are further reduced.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to a fast and efficient signal acquisition method for a BeiDou Navigation Satellite System (BDS). Background technique [0002] With the implementation of my country's Beidou satellite navigation system, satellite signal acquisition technology has become an important technology in the current and future satellite communication systems. The purpose of BDS-2 signal acquisition is to obtain the carrier frequency and code phase of all visible BDS-2 satellite signals. The search process of carrier frequency and code phase is a two-dimensional search process. If you add the search for different satellites, then the whole acquisition process is a three-dimensional search process. The basis of signal acquisition is the correlation of the ranging code, so for the search, only when the carrier and ranging code signals replicated inside the receiver are consistent ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 孙才智刘先峰张立造陈智方俊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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