基于时域平滑循环周期图的直扩信号载频估计

摘要

An algorithm for estimating the carrier frequency of DS-SS signals was proposed using time-smoothing symmetrical periodogram instead of cyclic spectrum according to cyclostationary feature of DS-SS signal to improve the precision of parameter estimation.The estimation performance was analyzed for the cyclic spectrum by time smoothing symmetrical periodogram from the tapering points in the case of limited data length.Simulation results show that the proposed algorithm is effective.%根据直接序列扩频（DS-SS）信号的特点,将其建立为循环平稳模型。利用循环谱分析的方法估计了低信噪比下DS-SS信号的载波频率。利用时域平滑循环周期图估计了循环谱密度函数,在循环谱密度函数的数字实现过程中,研究了有限采集数据条件下数据截短点数对循环谱的时域平滑周期图估计性能的影响,分析了经过时域平滑后的DS-SS信号载频估计精度。最后,仿真实验验证了算法的有效性。