一种改进的时域优化捕获算法

针对信号在传输过程中存在时延、Doppler频移及多径衰落等,接收信号的中心频点以及PN码相位存在不确定性问题,通过时频域处理、分段及均值处理、移动序列处理、快速Doppler加权估计等手段,结合XFAST捕获算法、均值捕获算法和时域融合捕获算法的优点,提出一种改进的时域优化捕获算法,从复杂度、捕获时间、捕获精度的角度进行算法效能分析。Matlab仿真得出时域优化捕获算法的Doppler估计误差小,捕获比例峰值优于现有的其他两种算法,搜索速度明显提高。

An improved capture algorithm of the time domain optimization

For there is delay, Doppler shift, as well as the multipath fading and so on in DS/FH signal transmission process, the center frequency of the received signal and the PN code phase uncertainty, through processing in time domain and frequency domain, segmentation and mean processing, mobile sequence processing, fast Doppler weighted estimation and other methods, com- bined with the advantages of XFAST algorithm, the mean acquisition algorithm and time domain fusion algorithm, this paper propos- es a method of time domain optimization algorithm which algorithm performance analysis of complex angle, acquisition time and ac- quisition precision. And the result is time domain optimization algorithm of Doppler estimation error is small, ratio of peak and fine acquisition is better than the other two existing algorithms and searching speed was more quickly obviously.