一、前言在锁相环路(PLL)中,输入信号的载波常常由于多普勒效应而发生变化,特别是接收宇宙探测卫星的信号时,不但有一定的频率偏移,而且还要考虑到频率的斜坡函数形状变化。这时就会在PLL中产生固定相位差,例如在对PSK信号进行同步检波时,固定相位差能使解调数据 I. Introduction In phase-locked loop (PLL), the carrier of the input signal often changes due to the Doppler effect. In particular, when receiving the signals of the space exploration satellite, not only a certain frequency offset but also a The frequency ramp function changes shape. In this case, a fixed phase difference occurs in the PLL. For example, when the PSK signal is synchronously detected, the fixed phase difference enables the demodulated data