凝视型激光主动成像系统性能验证  

Performance verification of staring laser active imaging system

作　　者：徐正平[1] 许永森[2] 姚园[2] 李刚[2] 石磊[2] 孙翯[2] 于潇[2] 沈宏海[2] 

机构地区：[1]中国科学院苏州生物医学工程技术研究所,江苏苏州215163 [2]中国科学院航空光学成像与测量重点实验室,吉林长春130033

出　　处：《光学精密工程》2017年第6期1441-1448,共8页Optics and Precision Engineering

基　　金：中国科学院国防科技创新基金资助项目(No.CXJJ-14-S123);吉林省科技发展计划资助项目(No.20150204022GX)

摘　　要：为了研究凝视型激光主动成像系统对非合作目标的成像性能及在目标跟踪中的应用,设计了基于APD阵列和分束照明的凝视型激光主动成像系统。对激光回波功率与目标距离之间的关系进行了理论分析,结果显示:200m外目标的回波功率小于1μW。为提高系统作用距离,选取高增益带宽积跨阻放大器OPA657N提高系统增益,并通过优化元件布局来克服高跨阻值时的通道串扰。实验验证了距离方程的正确性。在此基础上,采用八连通团块检测方法实现目标探测,并对两轴目标跟踪进行了实验验证。结果显示:系统能够对200m处非合作目标稳定成像,并能获取420m处非合作目标的回波信号;当目标在俯仰轴、偏航轴方向行程大于2.5°时,系统能够实时探测并稳定跟踪。A staring laser active imaging system based on APD arrays and splitting beam illumination was designed,in order to study the imaging performance of the imaging system on non-cooperative target in target tracking.The relationship between laser echo power and target distance was analyzed theoretically,and the result shows that the echo power of targets beyond 200 mis less than 1μW.In order to improve operating distance of the system,a trans-impedance amplifier OPA657 N with high gain-bandwidth was adopted to improve the system gain.In addition,the crosstalk of channels at high trans-impedance was overcame by optimizing the element arrangement.A block detection of 8-adjacent connection algorithm was employed to realize target detection and two-axis target tracking based on the verification of distance equation.The results show that the proposed imaging system can achievestable imaging on non-cooperative target in 200 m,and can obtain echo signal of non-cooperative target in 420 m.When travel of the target in the direction of pitch axis and yaw axis is more than 2.5°,the system can realize real-time detection and stable tracking of the target.

关 键 词：激光主动成像 凝视型 目标跟踪 非合作目标 

分 类 号：TN249[电子电信—物理电子学] P225.2[天文地球—大地测量学与测量工程]