载波提取锁相环是电子攻击的一个重要对象。环路在不同干扰样式下的失锁门限不尽相同。大部分文献中,通常以环路信噪比6dB作为环路的失锁门限,实验中发现此门限值对人为干扰并不适用。文中就白噪声、连续波信号和脉冲信号对载波提取锁相环的干扰进行了分析,给出了脉冲干扰条件下环路失锁门限的计算方法,阐述了脉冲干扰造成环路的闪锁和失锁现象。实验数据证实了脉冲干扰条件下载波提取锁相环的失锁门限更低。 Carrier extraction phase-locked loop is an important target of electronic attacks. Loops under different interference patterns have different lock thresholds. Most of the literature, the loop signal to noise ratio is usually 6dB as the loop of the lock threshold, the experiment found that this threshold is not suitable for human interference. In this paper, the interference of white noise, continuous wave signal and pulse signal on the phase-locked loop of carrier extraction is analyzed. The calculation method of the lost-lock threshold of the loop under pulse interference is given. Loss of lock. The experimental data confirm that under the condition of impulsive interference, the phase loss threshold of carrier extraction phase locked loop is lower.