激光半主动制导系统通常是光电对抗的主要对抗对象, 因此, 其真实的作用距离就成为了光电对抗中最为关心的指标。定义了激光半主动制导系统的极限作用距离, 考虑大气湍流对激光传输的影响, 推导出了激光半主动制导系统照射方程的一般形式, 并参考激光测距系统测距性能的测试方法, 通过改进消光比法和最大测程法的转换, 得到了激光半主动制导系统的极限作用距离测量模型。最后, 分别进行了改进消光比试验和最大测程试验, 验证了极限作用距离测量模型。实验结果表明: 依据模型只需在一定天候条件下进行改进的消光比试验即可得到任意天候条件下激光半主动制导系统的极限作用距离, 且相对误差较小, 不超过1%。

Semi-active laser guided system is the main object of the electro-optical countermeasures, so its real ultimate operating range becomes the most concerned index to evaluate the performance of electro-optical countermeasure weapons. In this paper, the ultimate operating range of semi-active laser guided system is defined. The effects of atmospheric turbulence are taken into account, and the general form of radiation equation for semi-active laser guidance is obtained. Depending on the range measurement for laser range finder, a measurement model of the ultimate operating range for semi-active laser guided system is achieved, according to the interconversion of the modified extinction-ratio measurement and the maximum range measurement. Finally, experiments were carried out to test these two measurements. The results confirm the measurement model, and indicate that the ultimate operating range of semi-active laser guided system in an arbitrary weather can be obtained through the modified extinction-ratio measurement in certain weather. The relative error is less than 1%.