从激光敌我识别原理和询问信号编码模式分析出发,研究了重频激光对PPM编码调制的激光敌我识别系统的干扰机理,得出了在一定重复频率激光干扰环境下激光敌我识别概率的数学表达式。针对干扰激光重频、询问信号编码、应答设备波门等参数对激光敌我识别概率的影响进行了仿真计算和分析,得出了不同参数设置对激光敌我识别概率的影响。仿真结果表明,对于同一种激光询问信号,正确识别概率随着干扰激光重频的升高而明显降低,可以通过缩短应答设备的波门宽度、降低询问信号基频或提高询问信号中有效脉位的占空比等方法,改变激光询问信号的参数,以降低其受非询问激光信号的干扰程度,从而提高激光敌我识别系统的抗重频激光干扰能力,对提高激光敌我识别系统的抗激光干扰能力具有一定的参考价值。

Based on the operation principles and signal coding mode about laser identification of friend or foe (IFF) system, the jamming mechanism of repetition frequency laser against laser IFF system is analyzed. The mathematic expressions are deduced to calculate the identify probability of laser IFF systems in a certain level laser jamming. Under the factors which affect the identify probability are analyzed in details, such as jamming laser repetition frequency, signal coding mode and wave gate, and the simulation methods and results are presented. The simulation results show that the identify probability decreases as laser frequency increases. It can be helpful to enhance the laser IFFs performance against the laser jamming through reducing wave gate, reducing signal fundamental, or increasing effective signal pulse.