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以TDRSS数传系统为研究背景,针对TDRSS数传信号的特点,以实现高速8PSK调制信号的载波同步与跟踪为研究前提。提出了一种采用二叉树(BinarySearchTree)频率搜索方法实现捕获及采用平均“滑动窗”递推最小二乘(RLS)一步预测方法实现频率跟踪的算法,并针对此方法进行了理论推导和蒙特卡洛(MonteCarlo)仿真。结果表明:该方法适用于全数字高速数传8PSK调制信号接收系统,同时也可移植、推广至全数字雷达接收机中。
Taking the TDRSS digital transmission system as the research background, in view of the characteristics of TDRSS digital signal, the carrier synchronization and tracking of high-speed 8PSK modulated signal are studied. An algorithm of frequency tracking based on BinarySearchTree frequency search method and one-step prediction method using average “sliding window ” Recursive Least Squares (RLS) method was proposed. The theoretical derivation and Monte- Monte Carlo simulation. The results show that this method is suitable for all-digital high-speed digital 8PSK modulated signal receiving system and can also be ported and extended to the all-digital radar receiver.