A Novel Low-Complexity Acquisition Method for Next Generation GNSS Signals

Pei-Hsueh Lee, Dong-Hong Liu, Wei-Lung Mao, Hen-Wai Tsao, Fan-Ren Chang, Hsin-Chung Yeh, Kun-Tso Chen

Abstract:	In this paper, a new code for code acquisition in a navigation receiver is proposed. Conceptually, the code is derived by cyclically shifting a spreading code multiple times and combining all the shifted codes. This cyclically shift-and-combine (CSC) code, like the original spreading code, can be used to despread the received signal and extract the code-phase information. A corresponding acquisition and verification structure with respect to the CSC code is also presented. Because the period of the CSC code is shortened, the search space of the code phases shrinks and the computation of the code correlations reduces. Simulation results show that the CSC-base code acquisition works efficiently given the received signal strength is satisfactory, while it still benefits from a longer integration time if the signal is weak. Using the proposed code, operations and hardware complexity of matched filter based correlators can be approximately decreased by 75%.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	1507 - 1513
Cite this article:	Lee, Pei-Hsueh, Liu, Dong-Hong, Mao, Wei-Lung, Tsao, Hen-Wai, Chang, Fan-Ren, Yeh, Hsin-Chung, Chen, Kun-Tso, "A Novel Low-Complexity Acquisition Method for Next Generation GNSS Signals," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 1507-1513.
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