扫描成像系统的回波信号检测方法

为实现对隐蔽性很强的、被动工作的红外系统的有效探测，讨论了光学系统的后向反射特性，提出应用单频调制的连续激光对扫描式红外热成像目标进行有效探测的新方法．针对目标回波信号特征，提出利用回波信号的相位信息，采用直接采样的数字正交检波技术实现对低信噪比回波信号的可靠检测．应用该方案对实际目标回波信号获得了满意的检测结果．

Study of the optical signal detection reflected by the infrared scanning imaging systems

In order to detect IR imaging systems working in a passive mode effectively,the retrodirective reflection of the optical systems against the incident laser is discussed and a new technique for a single frequency modulated CW laser against such targets is provided.Based on the analysis of echo signals' characteristics,the technique for digital quadrature coherent detector by direct sampling has been used to detect such signals with a low S/N ratio and the expected results have been obtained in experiments.