干扰和噪声对激光制导性能及精度的影响

Effect of disturbance and noise on laser guidance performance and precision

针对某激光导引头检测中输出弹目视线角速度误差较大的情况,分析指出弹目视线角速度噪声是角跟踪回路中探测器噪声、弹体扰动和摩擦等干扰力矩共同作用产生的。根据导引头控制原理建立了其稳定跟踪回路模型,定量分析了这些误差因素对导引头稳定跟踪性能和弹目视线角速度输出指令的影响程度。然后实测分析了激光导引头输出弹目视线角速度噪声特性,建立了其与弹目距离的函数关系,并将其加入某制导武器制导模型中进行仿真。结果表明:加入弹目视线角速度噪声后,弹体滚转姿态角变化较大,舵偏角变化也较大,近距离时由于角速度指令噪声较小对全弹道及脱靶量的影响比较小,这与实际检测结果相符较好。但近距时当角速度指令处于噪声峰值处,弹偏离后来不及修正可能会对导弹的近距攻击区有影响,研究方法及结论对导引头的实际研究测试及弹的战术使用均有一定的参考价值。

In view of the fact that the output of line of sight angular rate error was big in the .test of certain laser seeker, it was pointed out that line of sight angular noise root in the detector noise together with bomb disturbing and friction moment. Then stable tracking loop model was built based on the control principle of the laser seeker, the influence of above-mentioned error on tracking performance and los angular rate of the laser seeker was quantificationally analyzed. The characteristic of los angular rate noise of the laser seeker was analyzed, the function relationship with distance between missile and target was deduced by experiment method. Finally, the los angular rate noise was joined into control and guidance model of the laser guided missile. Simulation result showed that roll angle of missile and rudder departure angle varied obviously, angular noise changed small gradually along with the close up of missile and target and the miss distance varied less, which was accordant with actual test phenomenon. When the angular instruction was situated in the peak value of the angular noise, deviation of missile couldn＇t be modified timely, which possibly affected attack area of missile along with close up of missile and target. The research provids reference for further actual test of laser seeker and tactical application of missile.