基于变换探测功率的云雾后向散射识别

Cloud Backscatter Discrimination Based on Changeable Detection Power

小型近距激光探测系统在遇到浓密云雾时,由于云雾后向散射严重,造成探测器无法区分实体目标和云雾干扰。针对这一问题,提出了基于功率变换的云雾后向散射识别方法。该方法通过降低探测器发射功率,利用实体目标和云雾目标在功率变化后的回波幅值是否超过阈值门限这一特性区分两者,然后在信号处理部分进一步通过回波计数的方式来确定云雾信号。实验表明:该方法在一定距离内能够较好地识别出云雾目标和实体目标。

The small-scale close laser detection system cannot distinguish actual target from cloud interference because of serious cloud backscattering issue when operating in dense cloud and fog. In order to solve the prob-lem,a cloud backscatter discrimination method based on changeable power was put forward in this paper. Through reducing the detector＇s transmitting power, the proposed method used the feature that whether the echo amplitude exceeding the threshold value after the power of actual target and cloud target had been changed to distinguish them,and then the cloud signals was further determined by the way of echo counting in signal pro-cessing. Experimental results showed that the proposed close laser detection system could well distinguish the hard target from cloud target within certain distance range.