用α-β滤波器对一段相位差数据进行滤波处理,同时给出了高精度的相位差变化率数据.该数据可用于相位差变化率方法的无源定位.-With α-β filter to filter the data processing section of the phase difference, and gives a high-precision phase change rate data The data can be used to locate passive phase change rate method.