Quick Beidou satellite signal capturing method and system based on circulation mode

Abstract

The invention relates to the field of satellite communication and discloses a quick Beidou satellite signal capturing method and system based on a circulation mode. The method includes the steps that a Beidou satellite signal is received, and the satellite signal is processed so that a medium-frequency digital signal is obtained; a base-band signal is obtained according to the medium-frequency digital signal, and a complex signal of the base-band signal is obtained after further processing; numerical treatment is carried out on the complex signal and a signal output by a local pseudo-code generator, threshold judgment is carried out on a result, if a peak value larger than a threshold value occurs, the position corresponding to the peak value is determined to be a pseudo-code phase position, and a frequency value of a local carrier is captured as carrier frequency of the signal; if no peak value larger than the threshold value occurs, the searching range of Doppler frequency shift is adjusted, and circulatory capturing is carried out. According to the quick Beidou satellite signal capturing method and system, calculation in the capturing process of satellite signals is effectively reduced, complexity of the system is reduced, the capturing speed is high, capturing time is short, precision is high and the method and system are easy to use.

Description

technical field [0001] The invention relates to a method for capturing satellite signals, in particular to a method and system for quickly capturing Beidou satellite signals based on a circulation mode. Background technique [0002] BeiDou Navigation Satellite System ("BDS") is a global satellite navigation system independently developed and operated by China. It is also known as the world's four major satellite navigation systems together with the US GPS, Russia's GLONASS, and the EU's Galileo system. The US GPS system is now widely used, and China's Beidou satellite navigation system is now in operation. The main task of the Beidou receiver is to receive and process the signals transmitted by Beidou satellites to obtain navigation messages and observations. To accomplish these tasks, the first thing to do is to capture satellite signals. Navigation satellite signal acquisition is a search process for the carrier frequency and pseudo-code phase of the received signal. Whe...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for fast acquisition of Beidou satellite signals based on a cyclic method, so as to solve the problem that the acquisition speed in the original Beidou satellite signal acquisition method is relatively slow, or the acquisition accuracy is not high, or the implementation is complicated. more difficult questions

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