包含有数控振荡器的锁相环可以实时读出输入信号的频率,因此可以在连续波测速定位系统中,用来直接测量瞬时多普勒频率。提出了一种测频锁相环方案,对其稳定性和精度进行了分析,与实验结果基本一致。还说明含有数控振荡器的锁相环可以直接测量瞬时相位。最后介绍了一种数控振荡器,提出了一种简单的设计方案。 The phase-locked loop, which contains a numerically controlled oscillator, reads the frequency of the input signal in real time and can therefore be used to directly measure the instantaneous Doppler frequency in a continuous-wave velocity-measuring positioning system. A scheme of frequency-measurement PLL is proposed, its stability and precision are analyzed, which are basically consistent with the experimental results. Also shows that the phase-locked loop with a numerically controlled oscillator can directly measure the instantaneous phase. Finally, a numerical control oscillator is introduced, and a simple design scheme is proposed.