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Neumann-Hoffman Code Evasion and Stripping Method For BeiDou Software-defined Receiver

Published online by Cambridge University Press:  28 September 2016

Qian Meng ,
Jian-ye Liu ,
Qing-hua Zeng ,
Shao-jun Feng  and
Rui-zhi Chen
Qian Meng
Affiliation:
(Navigation Research Center, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China) (Satellite Communication and Navigation Collaborative Innovation Center, Nanjing, China)
Jian-ye Liu
Affiliation:
(Navigation Research Center, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China) (Satellite Communication and Navigation Collaborative Innovation Center, Nanjing, China)
Qing-hua Zeng*
Affiliation:
(Navigation Research Center, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China) (Satellite Communication and Navigation Collaborative Innovation Center, Nanjing, China) (Conrad Blucher Institute for Surveying and Science of Texas A&M University Corpus Christi, Corpus Christi, USA)
Shao-jun Feng
Affiliation:
(Centre for Transport Studies, Department of Civil and Environmental Engineering, Imperial College London, UK)
Rui-zhi Chen
Affiliation:
(State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China)
*
(E-mail: zengqh@nuaa.edu.cn)
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Abstract

The acquisition and tracking strategies of the BeiDou navigation satellite signals are affected by the modulation of Neumann-Hoffman code (NH code), which increases the complexity of receiver baseband signal processing. Based on the analysis of probability statistics of the NH code, a special sequence of incoming signals is proposed to evade the bit transitions caused by the NH code, and an NH Code Evasion and Stripping method (NCES) based on the NH-pre-modulated code is proposed. The NCES can be applied in both 20-bit NH code and 10-bit NH code. The fine acquisition eliminates the impact of NH code on the traditional tracking loop. These methods were verified with a BeiDou PC-based software-defined receiver using the actual sampled signals. Compared with other acquisition schemes which try to determine or ignore the NH code phase, the NCES needs fewer incoming signals and the actual runtime is greatly reduced without sacrificing much time to search in the secondary code dimension, and the success rate of acquisition is effectively improved. An extension of Fast Fourier Transform (FFT)-based parallel code-phase search acquisition gives the NCES an advantage in engineering applications.

Keywords

Neumann-Hoffman CodeBeiDouSoftware-defined receiverEvasion
Type
Review Article
Information
The Journal of Navigation , Volume 70 , Issue 1 , January 2017 , pp. 101 - 119
Copyright
Copyright © The Royal Institute of Navigation 2016 

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