在光电对抗领域，高重频激光干扰是一种非常有效的干扰技术。从高重频激光 干扰的原理出发，通过对由干扰激光功率引起的激光导引头接收系统信噪比下降的现象进行理论分析和数值 计算，理清了以往对高重频激光干扰的认识。数值计算结果表明，在目标距离一定的情况下，导弹制 导系统的信噪比会随干扰激光功率的增加而减小；在激光干扰功率相同的情况下，导弹制导系统的信噪 比会随目标距离的增加而减小。在目标距离为6000 m的情况下，当干扰激光功率大于0.4 W时，导弹制导系统的信噪 比降到1以下，此时制导系统不能有效地从各种噪声之中检测出目标回波信号，说明被攻击目标能够得到有效 保护。

High repetition frequency laser jamming is a highly effective jamming technology in the field of opto-electronic countermeasure. Starting from the principle of high repetition frequency laser, the decrease of the signal-to-noise ratio (SNR) of the receiving system in a laser seeker caused by jamming laser power is analyzed theoretically and calculated numerically, and hence the previous overall understanding of high repetition frequency laser jamming is clarified. The numerical calculation result shows that for a missile guidance system, its SNR may be reduced with the increase of jamming laser power at a given distance and may be reduced with the increase of the target distance in the case of same jamming laser power. When the target is at the distance of 6000 m and the jamming laser power is greater than 0.4 W, the SNR of the missile guidance system may be reduced to less than 1. At this time, the missile guidance system can not detect the target echo signals from different noises, and so the target to be attacked can be protected effectively.