电讯技术2016，Vol.56Issue(9)：1011-1016,6.DOI:10.3969/j.issn.1001-893x.2016.09.011
基于信号估计的扩频测控信号快捕方法
A Rapid Capture Method of Spread Spectrum TT & C Signal Based on Signal Estimation
摘要
Abstract
In order to further increase the capture speed of spread-spectrum tracking,telemetry and com-mand(TT&C) system,the algorithm of state estimation for code phase with the help of auxiliary sequence is researched and the accuracy is analyzed. For the problem that the acquisition probability decreases abruptly under the high dynamic condition,the method of frequency offset estimation based on Maximum Likelihood is put forward to fix the deviation of coherent carrier frequency,and the capture probability can be signifi-cantly improved. The rapid capture algorithm based on the code phase and carrier frequency estimation is designed. The simulation result shows that the algorithm can effectively capture the signal in good case of carrier-to-noise ratio. To improve the reliability of the capture algorithm in low carrier-to-noise ratio,the integrated capture method is proposed which uses the estimated result as the initial value of partial matched filter-fast Fourier transform( PMF-FFT) . Compared with the traditional method,the proposed method can significantly reduce the average capture time without increasing hardware complexity. The rapid capture method has certain theoretical significance and engineering application value.关键词
扩频测控/伪码相位估计/频率估计/快速捕获Key words
spread-spectrum TT&C/pseudo-code phase estimation/frequency estimation/rapid capture分类
信息技术与安全科学引用本文复制引用
刘燕都,张宝玲,郑海昕..基于信号估计的扩频测控信号快捕方法[J].电讯技术,2016,56(9):1011-1016,6.基金项目
武器装备预研基金项目(9140A24070509KG02) Foundation Item:Weapons and Equipment Pre-research Fund Project(9140A24070509KG02) （9140A24070509KG02）
