Direct P-Code Acquisition Based on Wavelet Filtering

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 246)

Abstract

Compared with the C/A-Code, GPS P-Code offers much higher accuracy but also the higher tolerance to jamming and spoofing. It has large Doppler frequency shift, long code period and high code rate. According to these characters, a new scheme for direct P-Code acquisition using auxiliary acquisition is proposed in the paper, which estimates the phase and Doppler of received P-Code signal in the two dimensional search. In order to finish the auxiliary acquisition rapidly, the wavelet is used to decrease the quantity of data. True phase alignment is detected using a conventional parallel search scheme, where the initial phase and Doppler are set to the values obtained by the auxiliary acquisition and whose amount of parallel channels is required less. The result of computation shows the proposed scheme achieve the priori information of phase and Doppler faster and correctly.

Keywords

GPS DSP Direct P-code acquisition Wavelet Auxiliary acquisition 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.College of Electronic EngineeringChengdu University of Information TechnologyChengduChina

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