导引头波门内，制导信号能否进入以及高重频干扰是否超前均是概率问题，文中采用概率分析的方法，讨论了制导激光进入波门内的概率(制导概率)和高重频激光第一个脉冲超前制导激光的概率(超前概率)。通过研究制导概率与激光器出光时间标准差(激光时序标准差)的关系和制导概率与波门宽度的关系，得出了当波门宽度为激光时序标准差的6.18倍时，可认为制导激光完全进入波门内。基于制导概率研究超前概率得出了: 超前概率与波门内高重频脉冲数的关系; 不同高重频激光频率下超前概率与波门宽度的关系; 当波门内出现4个高重频脉冲数时，超前概率为98.21%。所以从激光制导讲，可根据激光时序标准差选取导引头波门宽度,实现精确制导; 从高重频干扰效果讲，可根据导引头波门宽度确定高重频干扰频率，从而达到有效干扰。

In the seeker gate, whether the guidance signal can enter and whether the high-frequency interference is advanced is a probability problem. The probabilistic analysis method was used to discuss the probability (guidance probability) of the guided laser entering the gate and the probability (advance probability) of the first pulse of the high-frequency laser leading the guided laser. By studying the relationship between the guidance probability and the standard deviation of the laser light extraction time (standard deviation of laser timing) and the relationship between the guidance probability and the gate width, it was concluded that when the gate width was 6.18 times the standard deviation of the laser timing, the guided laser can be considered to completely enter the seeker gate. Based on the guidance probability, the relationship between the advance probability and the number of high-frequency pulses in the gate was obtained; the relationship between the advance probability and the gate width at different high-frequency laser frequencies was gained. When there were 4 high-frequency pulses in the gate, the advance probability was 98.21%. Therefore, from the laser guidance, the seeker gate width can be selected according to the standard deviation of laser timing to achieve accurate guidance; from the high-frequency interference effect, the high-frequency interference frequency can be determined according to the seeker gate width to achieve effective interference.