摘要
距离选通水下激光成像系统是一种基于时间标记原理的水下光电成像系统,它能够有效抑制水体后向散射光的干扰,提高目标探测距离,具有较高的军事和民用价值。在距离选通水下激光成像系统中,ICCD可能接收到的光信号包括水体后向散射光、目标反射直射光、以及目标反射光的前向散射光。建立了ICCD接收信号光能量的几何模型,在给定开门时刻和选通门宽参数条件下,给出了通过点扩散函数计算ICCD像元上所能接收到的目标反射光的直射光及其所引起的水体前向散射光能量的方法,以及通过水体分层计算水体后向散射光的方法,定义了距离选通水下激光成像系统信噪比,分析了目标距离对信噪比的影响并给出了仿真结果。
Range-gated underwater laser imaging system is a kind of underwater photoelectric imaging system which is based on the principle of time label. It can effectively restrain the backscatter of water and improve the range of target detection, and has superior value for military and civil use. In the range- gated underwater laser imaging system, the lights received by ICCD include the backscatter of water, the direct component and forward scatter of reflected light of the target. Computing model of light energy received by ICCD was built. Giving the moment and the width of ICCD opening gate, the direct component and forward scatter of reflected light were analyzed and the calculation methods based on PSF theory were studied. The backscatter of water was calculated through water layering. According to those studies, the signal to noise ratio of range-gated underwater laser imaging system was given. Finally, the impact of target range on the SNR was analyzed and simulation result was given.
出处
《红外与激光工程》
EI
CSCD
北大核心
2013年第8期2022-2026,共5页
Infrared and Laser Engineering
基金
国家部委基金(4010714010301)
关键词
成像系统
距离选通
点扩展函数
信噪比
image system
range-gated
point spread function
signal to noise ratio
