Satellite signal capturing method and equipment

Abstract

The invention provides a satellite signal capturing method and equipment, and relates to the field of satellite navigation. The satellite signal capturing method and equipment aim to reducing the algorithm complexity of captured weak satellite signals and reducing consumption of resources of a receiver. The satellite signal capturing method comprises the steps that receiving signals sent by a navigation satellite are received through the receiver at the capturing frequency, re-sampling is conducted on the receiving signals, odd-even grouping is conducted on sampling results and correlation operation is conducted on grouping results to determine that satellite signals of the navigation satellite are captured. The method and equipment are used for capturing the satellite signals.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to a method and equipment for capturing satellite signals. Background technique [0002] In recent years, satellite navigation and positioning systems have been more and more widely used. Receivers can achieve all-day and all-weather continuous navigation around the world, and the capture of satellite signals is the first step and key to receiver signal processing. The performance directly affects the overall positioning effect of the receiver. [0003] In the prior art, the receiver needs to obtain signal propagation time and satellite position information from at least 4 satellites, and obtain the position of the receiver based on these information. Specifically, the receiver needs to complete rough synchronization with the received satellite signals , that is, the acquisition process of the spread spectrum signal, the phase offset of the pseudo-random code and the signal carr...

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Problems solved by technology

[0004] When the receiver is located in a complex environment such as indoors, forests or cities, the satellite signal is severely weakened, and the signal power will be far lower than the working range of the general receiver, thus limiting the application field of satellite navigation and positioning. , the prior art usually uses a parallel acquisition method based on Fourier transform FFT. Specifically, the parallel acquisition method based on FFT uses multiple acquisition channels, and each channel completes the received signal in parallel with different code phases and different Doppler frequencies. The correlation calculation of the local regenerated signal, the acquisition speed is faster, but because this method requires a large number of FFT calculations, it increases the algorithm complexity of weak satellite signal acquisition, thus greatly consuming the resources of the receiver

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