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code acquisition method based on wavelet transform filtering

Journal of Systems Engineering and Electronics 2015年第6期26卷 1169-1176页

作者： Chao Wu Luping Xu Hua Zhang Wenbo Zhao School of Aerospace Science and Technology Xidian University

In order to improve the acquisition probability of satellite navigation signals, this paper proposes a novel code acquisition method based on wavelet transform filtering. Firstly, the signal vector 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）. Finally, 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.

关键词： code acquisition wavelet transform filtering detection probability.

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Design and implementation of code acquisition using sparse Fourier transform

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Journal of Systems Engineering and Electronics 2024年第5期35卷 1063-1072页

作者： ZHANG Chen WANG Jian FAN Guangteng TIAN Shiwei College of Electronic Science and Technology National University of Defense TechnologyChangsha 410073China National Innovation Institute of Defense Technology Academy of Military ScienceBeijing 100071China

code acquisition is the kernel operation for signal synchronization in the spread-spectrum *** reduce the computational complexity and latency of code acquisition,this paper proposes an efficient scheme employing sparse Fourier transform(SFT)and the relevant hardware architecture for field programmable gate array(FPGA)and application-specific integrated circuit(ASIC)*** are made at both the algorithmic level and the implementation level to enable merged searching of code phase and Doppler frequency without incurring massive hardware *** with the existing code acquisition approaches,it is shown from theoretical analysis and experimental results that the proposed design can shorten processing latency and reduce hardware complexity without degrading the acquisition probability.

关键词： code acquisition hardware structure sparse Fourier transform(SFT) code phase estimation Doppler frequency estimation

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