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Parallel Frequency Acquisition Algorithm for BeiDou Software Receiver Based on Coherent Downsampling

Published online by Cambridge University Press:  14 August 2019

Qingxi Zeng ,
Chang Gao ,
Wenqi Qiu ,
Zhaihe Zhou  and
Chade Lyu
Qingxi Zeng*
Affiliation:
(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu, PR China) (State Key Laboratory for automobile simulation and control, Jilin University, Jilin, PR China)
Chang Gao
Affiliation:
(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu, PR China)
Wenqi Qiu
Affiliation:
(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu, PR China)
Zhaihe Zhou
Affiliation:
(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu, PR China)
Chade Lyu
Affiliation:
(College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu, PR China)
*
(E-mail: [email protected])
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Abstract

The time it takes to acquire a satellite signal is one of the most important parameters for a Global Navigation Satellite System (GNSS) receiver. The Parallel Frequency space search acquisition Algorithm (PFA) runs faster than the Parallel Code phase search acquisition Algorithm (PCA) when the approximate phase of Pseudo-Random Noise (PRN) code and the approximate value of a Doppler shift are known. However, a large amount of data is needed to be dealt with by the Fast Fourier Transform (FFT) in a traditional PFA algorithm because it processes a narrow-band signal with the initial sampling frequency after the PRN code is stripped. In order to reduce the computational complexity of the traditional PFA algorithm, a down-conversion module and a downsampling module were added to the traditional PFA in the work reported here. Experiments demonstrated that this method not only succeeded in acquiring BeiDou B1I signals, but also the time for acquirement was reduced by at least 80% with the modified PFA algorithm compared with the traditional PFA algorithm. The loss in Signal-to-Noise Ratio (SNR) did not exceed 0·5 dB when the number of coherent points was less than 500.

Keywords

BeiDou software receiverParallel frequency acquisitionCoherent downsampling
Type
Research Article
Information
The Journal of Navigation , Volume 73 , Issue 2 , March 2020 , pp. 433 - 454
Copyright
Copyright © The Royal Institute of Navigation 2019

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