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。
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.
出处
《飞行器测控学报》
2012年第1期55-59,共5页
Journal of Spacecraft TT&C Technology
