。利用理想二阶锁相环构造了三阶

环，对其捕获带宽、时间响应特性、稳定性和误差响应特性进行了仿真研究，分析了三阶环的参数选择

原则和跟踪卫星多普勒频偏的能力，并给出了环路滤波器的数字实现框图-. Ideal second-order phase-locked loop constructed using the third-order loop, its capture bandwidth, time response, stability and response characteristics of the error simulation studies to analyze the third-order loop parameters and track the satellite Doppler shift principle ability, and gives the block diagram of digital implementation of loop filter