| 一种DS/FH混合扩频信号的并行捕获方法 |
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| 引用本文： | 孙晓锋,刘云飞,万达.一种DS/FH混合扩频信号的并行捕获方法[J].飞行器测控学报,2012(1):55-59. |
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| 作者姓名： | 孙晓锋 刘云飞 万达 |
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| 作者单位： | 中国电子科技集团公司第54研究所;大连民族大学 |
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| 摘 要： | 为了解决低信噪比条件下高跳速DS/FH（直接扩频/跳频扩频）混合扩频信号的快速捕获问题,提出了一种FFT-IFFT（快速傅里叶变换-快速傅里叶逆变换）与非相干累加相结合的并行捕获算法。通过多支路同时运算的方式构建非相干累加矩阵,使非相干累加运算可以并行实施。分析表明,采用并行非相干累加后,既提高了捕获判决的准确性,又保证了捕获搜索的快速性。
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| 关 键 词： | 直接扩频／跳频扩频（DS／FH）混合扩频信号 同步捕获 快速傅里叶变换一快速傅里叶逆变换（FFT_IFFT） 非相干累加 |
A Parallel Acquisition Method for DS/FH Hybrid Spread Spectrum Signal |
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| SUN Xiaofeng,LIU Yunfei,WAN Da.A Parallel Acquisition Method for DS/FH Hybrid Spread Spectrum Signal[J].Journal of Spacecraft TT&C Technology,2012(1):55-59. |
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| Authors: | SUN Xiaofeng LIU Yunfei WAN Da |
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| Institution: | 1.Research Institute No.54 of CETC,Shijiazhuang 050081;2.Dalian Nationalities University,Dalian,Liaoning Province 116600) |
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| Abstract: | To meet requirements of fast acquisition of DS/FH(Direct Spread-Spectrum/Frequency Hopping) hybrid spread spectrum signals at high hopping frequency and low signal-to-noise ratio,this paper proposes a new parallel acquisition method incorporating both noncoherent accumulation and FFT-IFFT(Fast Fourier Transform-Inverse Fast Fourier Transform).A noncoherent accumulation matrix is constructed with coherent accumulation results to enable parallel noncoherent accumulation.Analysis shows that parallel noncoherent accumulation improves the accuracy of acquisition identification and increases the speed of search and acquisition. |
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| Keywords: | Direct Spread-Spectrum(DS)/Frequency Hopping(FH) Hybrid Spread Spectrum Parallel Acquisition Fast Fourier Transform(FFT)-Inverse FFT(IFFT) Noncoherent Accumulation |
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