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: 200 m外目标的回波功率小于1 μW。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200 m处非合作目标稳定成像, 并能获取420 m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 m is less than 1 μW. In order to improve operating distance of the system, a trans-impedance amplifier OPA657N 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 achieve stable 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.