PRIS: A Novel Complex Sequence Construction Method
Unexceptionally, modern global Navigation Satellite System (GNSS) adopt Direct Sequence Spread Spectrum (DSSS) signal structure, in which, correlation property of Pseudo Random Noise (PRN) code play an important role of affecting its rejection performance
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PRIS: A Novel Complex Sequence Construction Method Zuping Tang, Jiaolong Wei, Hongwei Zhou, Tao Yan, Zhihui Zhou and Bo Qu
Abstract Unexceptionally, modern global Navigation Satellite System (GNSS) adopt Direct Sequence Spread Spectrum (DSSS) signal structure, in which, correlation property of Pseudo Random Noise (PRN) code play an important role of affecting its rejection performance to Narrow Band Interference (NBI) and Multiple Address Interference (MAI). In order to mitigate the cross-correlation performance degradation due to tiered code construction, this paper proposes a new method for constructing complex sequence of GNSS civil signal. Based on any primary sequence of length L, Pseudo Random Initiate State (PRIS) transformation is used to construct a complex sequence of length NL, and a feasible generator scheme is presented. Simulation and analysis results shows, the acquisition complexity of PRIS sequence is similar to tiered code, and the correlation property of PRIS sequence is 4–5 dB better than tiered code, which approaches the performance of random sequence of length NL. The proposed method is applicable to civil GNSS signal designing, and is helpful to improve the receiving performance in challenge environment without distinct additional complexity, which will be attractive to GNSS users around the world. Keywords PRN code
Cross-correlation PRIS sequence GNSS
Z. Tang (&) J. Wei T. Yan Z. Zhou B. Qu Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, China e-mail: [email protected] H. Zhou Beijing Institute of Tracking and Telecommunication Technology, Beijing 100094, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume II, Lecture Notes in Electrical Engineering 304, DOI: 10.1007/978-3-642-54743-0_12, Springer-Verlag Berlin Heidelberg 2014
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12.1 Introduction Unexceptionally, modern global Navigation Satellite System (GNSS) adopt Direct Sequence Spread Spectrum (DSSS) signal structure, in which, correlation property of Pseudo Random Noise (PRN) code play an important role of affecting its rejection performance to Narrow Band Interference (NBI) and Multiple Address Interference (MAI). Code Length, the first parameter should be decision in GNSS PRN code design, usually is hard to decision. With longer code length, property of both Auto Correlation and Cross Correlation will be better, but complexity of code acquisition will inevitably increase. With shorter code length, faster acquisition is met, but good correlation property is missing, which is harmful to improve acquisition sensitivity in challenge environment. PRN code with short code length is applied in traditional GPS C/A signal and repeats 20 times within single data bit duration [1], which causes three main drawbacks. Firstly, short code gives bad correlation protection, a strong signal from one satellite can crosscorrelate with the codes that a receiver uses to track other satellites,which may block reception of weak signa
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