GPS signal large-scale parallel quick capturing method and module thereof

Abstract

The invention discloses a GPS signal large-scale parallel quick capturing method, which comprises the following steps: configuring a large-scale parallel quick capturing module firmware comprising submodules of multiplier, data block cache, parallel part correlative processing, frequency domain transformation, postprocessing and digital controlled oscillator, code generator and the like in a system CPU; through the calling computation, converting low-medium frequency digital signals into baseband signals in a processing procedure to combine a data block; performing zeroing extension of the length and the data block on each equational data section in the data block; then based on FFT transformation computation, performing parallel part correlative PPC processing on each extended data section and local spreading codes, and performing FFT transformation on each line of a formed PPC matrix to obtain a result matrix; and performing coherent or incoherent integration on a plurality of result matrixes formed by processing a plurality of data blocks to increase the processing gain, improve the capturing sensitivity, roughly determine the code phase and the Doppler frequency of GPS signals, and achieve two-dimensional parallel quick capturing of the GPS signals. The method has high processing efficiency and high capturing speed, and can be applied to various GPS positioning navigation aids.

Description

field of invention [0001] The invention belongs to the technical field of satellite communication, and relates to a signal fast acquisition method of a satellite global positioning system receiver, in particular to a fast Fourier transform (FFT)-based large-scale parallel fast acquisition method of GPS signals and a module thereof. Background technique [0002] The Standard Positioning Service (SPS) of the Global Positioning System (GPS) is provided free of charge to all users around the world, and has been widely used at present. The E911 specification issued by the US Federal Communications Commission (FCC) requires that the user's location can be tracked through mobile phone information at any time and any place, and location information can be provided for all "911" call emergency services. Europe has also implemented similar E112 emergency services, and my country is formulating performance standards for satellite navigation receivers in order to provide users with bett...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the hardware capture scheme of the prior art GPS signal has a long realization period, high cost, and inflexible scheme, and the software capture scheme requires high processor computing power, long operation time, low calculation efficiency, and parallel search. Due to the defects of low precision and limited search effect, a FFT-based two-dimensional large-scale parallel fast capture method for GPS signals is proposed, and a software firmware for a large-scale parallel fast capture module of GPS signals is also proposed. process, capture the GPS signal, roughly determine its code phase and Doppler frequency, and realize the fast capture of the GPS signal

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