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一种改进的直扩系统大频偏二次捕获算法

DOI: 10.15918/j.tbit1001-0645.2015.09.014

Keywords: 二次捕获 直扩系统 超大频偏 FFT 低复杂度

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Abstract:

针对卫星通信中低信噪比大频偏信号的精确捕获问题,提出了一种改进的直扩系统二次捕获算法. 算法首先通过基于FFT的码相位并行搜索完成频偏的预估计和补偿,构造一个不含扩频码的准基带信号,然后对此信号采用含有辅助结构的FFT实现频率的精确估计和校正. 仿真结果表明,本文所提算法与传统二次捕获算法相比捕获性能大致相当,资源消耗降低24%,捕获时间减少84%. 给出了不同信噪比和扩频比下关键参数的选取方法,使算法具有较高的实用性

References

[1]  Holmes J K, Chen C C. Acquisition time performance of PN spread spectrum systems[J]. IEEE Trans Comm, 1977(25):778-783.
[2]  Unjeng C, William J H, Joseph I S. Spread-spectrum code acquisition in the presence of doppler shift and data modulation[J]. IEEE Trans Comm, 1990(38):241-250.
[3]  Rinder P, Bertelsen N. Design of a single frequency GPS software receiver[M]. [S.l.]: Aalborg University, 2004.
[4]  Psiaki M. Block acquisition of weak GPS signals in a software receiver[C]//Proceedings of ION GPS. Salt Lake City, USA: [s.n.], 2001:1-13.
[5]  薛斌,安建平,汪静,等.一种直接序列扩频系统的大频偏二次捕获算法[J].北京理工大学学报,2011(11):1351-1354. Xue Bin, An Jianping, Wang Jing, et al. Double acquisition algorithm of large frequency offset based on DSSS system[J]. Transactions of Beijing Institute of Technology, 2011(11):1351-1354. (in Chinese)
[6]  卢艳娥,谈展中,杨军,等.A/D量化对GPS接收机自适应天线性能的影响[J].宇航学报,2004(2):235-240. Lu Yane, Tan Zhanzhong, Yang Jun, et al. The effect of the A/D quantization on the performances of GPS receiver adaptive antenna[J]. Journal of Astronautics, 2004(2):235-240. (in Chinese)
[7]  齐国清,贾欣乐.插值FFT估计正弦信号频率的精度分析[J].电子学报,2004(4):625-629. Qi Guoqing, Jia Xinle. Accuracy analysis of frequency estimation of sinusoid based on interpolated FFT[J]. ACTA Electronica Sinica, 2004(4):625-629. (in Chinese)

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