为了对高重频激光干扰效果进行评估,首先基于不同的放大电路导引头分析了高重频激光干扰机理,简述了高重频激光干扰牵引效应;然后分析了激光导引头大动态范围信号放大的必要性,介绍了两种常用放大电路的原理;最后采用基于自动增益控制电路和对数放大电路的方法,对高重频激光干扰效果进行了分析.结果表明,高重频激光干扰是一种非常有效的干扰方式,但具体作用方式因导引头采用放大电路的不同而不同;自动增益控制电路由于存在增益调整时间,不能完成对信号的瞬时放大,高重频激光干扰会导致制导信号被屏蔽;对数放大电路会造成信号脉冲展宽,降低系统信噪比和4路信号一致性,使激光导引头易被高重频激光干扰.该研究结果对高重频激光干扰效果评估具有重要意义.

In order to evaluate jamming effect of high-repetition rate laser,the laser jamming mechanisms of laser seekers with different amplification circuits were analyzed.The traction effect of high-repetition rate laser jamming was described.The necessity of large dynamic range signal amplification in laser seekers was studied.The principles of two different amplification circuits were introduced.The jamming effect of high-repetition rate laser was analyzed based on automatic gain control circuit and log-ratio amplifier circuit.The research indicates that high-repetition rate laser jamming was an effective method of laser countermeasure.The action effects were different because of different amplifying circuits of laser seekers.An automatic gain control circuit could not amplify signal instantly because of gain adjustment time and guided signal would be shielded by high-repetition rate laser jamming.A log-ratio amplifier circuit could broad the signal pulse width and decreases the signal-to-noise ratio and four branches signal consistency,which make high-repetition rate laser jam a seeker easily.The results will be helpful for evaluation of jamming effect of high-repetition rate laser.