说明：  通过探索给定频带有用信号的周期特性,CFAR统计检测,基于时间协方差的估计,渐进连接的协方差矩阵.仿真性能的实现和测试性能的增强.
(By exploring the periodic characteristics of useful signals in a given frequency band, CFAR statistical detection, estimation based on time covariance, covariance matrix of progressive connection, the realization of simulation performance and the enhancement of test performance)