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Code acquisition method based on wavelet transform filtering

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In order to improve the acquisition probability of satel ite navigation signals, this paper proposes a novel code acquisition method based on wavelet transform filtering. Firstly, the signal vec-tor based on the signal passing through a set of partial matched filters (PMFs) is built. Then, wavelet domain filtering is performed on the signal vector value. Since the correlation signal is low in frequency and narrow in bandwidth, the noise out-of-band can be filtered out and the most of the useful signal energy is retained. Thus this process greatly improves the signal to noise ratio (SNR). Final y, the detection variable when the filtered signal goes through the combination process is constructed and the detection based on signal energy is made. Moreover, for the better retaining useful signal energy, the rule of selection of wavelet function has been made. Simulation results show the proposed method has a better detection performance than the normal code acquisition methods under the same false alarm probability.

code acquisitionwavelet transformfilteringdetec-tion probability

Chao Wu,Luping Xu,Hua Zhang,、Wenbo Zhao

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School of Aerospace Science and Technology, Xidian University, Xi’an 710071, China

This work was supported by the National Natural Science Foundation of ChinaThis work was supported by the National Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

6117213861401340K5051302015

2015

10.1109/JSEE.2015.00127

系统工程与电子技术(英文版)
中国航天科工防御技术研究院 中国宇航学会 中国系统工程学会 中国系统仿真学会

系统工程与电子技术(英文版)

CSCDSCIEI
影响因子：0.64
ISSN：1004-4132
年,卷(期)：2015.(6)
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