激光主动探测系统的探测能力分析

为了能够准确获取"猫眼"光学系统激光反射回波信号方向性和发散度的信息,基于光学系统"猫眼"效应和高斯光束的变换规律,依据激光大气传输的衰减和强度闪烁特性,给出了激光主动探测系统回波能量衰减和起伏的数学模型.结合野外试验分别对焦平面光学系统和离焦光学系统的关键指标进行了工程计算、分析论证和比较,结果表明:在激光主动探测系统探测识别时,可根据回波信号强度来识别不同类型的目标:同时对激光在大气传输中能量的衰减和光强的起伏进行了工程计算和分析论证,结果表明:大气湍流会大幅度降低激光主动探测系统的探测距离.

Analysis of detecting capability for active laser detection system

To get the exact information of directivity and divergence of laser reflection echo in the "cat eye" optical system, a mathematic model was built on the attenuation and fluctuation of echo energy in the active laser detection system, which was based on the "cat eye" effect of the optical system and the transform law of the Gauss beam. In this model, laser attenuation and intensity twinkle characteristic in the atmospheric transmission were included. The key indexes value of focal plane array (FPA) optical system and defocused optical system were calculated, analyzed and compared. The results prove that the active laser detection system could distinguish different types of targets based on echo signal intensity. Besides, laser energy attenuation and undulation of laser intensity in the atmospheric transmission were calculated and analyzed. The results show that atmospheric turbulence awfully decreases the detecting distance of the active laser detection system.