提高空间红外点目标探测系统探测能力的方法  

Methods for improving the detection ability of space infrared point target detection system

作　　者：杨小乐[1] 史漫丽[1] 周峰[1] 刘兴新[2] 行麦玲[1] YANG Xiao-le;SHI Man-li;ZHOU Feng;LIU Xing-xin;XING Mai-ling(Beijing Institute of Space Mechanics&Electricity,Beijing 100011,China;North China Research Institute of Electro-Optics,Beijing 100015,China)

机构地区：[1]北京空间机电研究所,北京100011 [2]华北光电技术研究所,北京100011

出　　处：《激光与红外》2023年第7期1060-1065,共6页Laser & Infrared

摘　　要：点目标探测系统是探测与测量系统,要保证弱目标高信噪比并且可同时探测不同强度的目标,实现大动态范围高灵敏度探测。传统成像系统通过切换探测器积分电容和改变积分时间无法同时兼顾信噪比与动态范围。针对采用模拟TDI红外探测器的扫描型红外点目标探测系统,本文综合考虑弱目标与背景杂波的辐射强度,提出红外探测器采用TDI累加不平均输出方案,提高相机信噪比,以及图像信噪比,从而提高弱目标探测能力。同时提出TDI累加输出与单像元输出自动选择方案解决累加不平均方案带来的系统动态范围变小问题。结合观测图像需求,给出了探测系统输出响应归一化的方法,最后通过实验测试,验证了系统设计方法的正确性。The point target detection system is a detection and measurement system that ensures high signal-to-noise ratio for weak targets and can simultaneously detect targets of different intensities,achieving high sensitivity detection over a large dynamic range.Traditional imaging systems cannot simultaneously balance signal-to-noise ratio and dynamic range by switching the detector′s integrating capacitance and changing the integrating time.For the scanning infrared point target detection system using linear TDI infrared detectors,this paper comprehensively considers the radiant intensity of weak targets and background clutter,and proposes that the infrared detector adopts the TDI accumulation uneven scheme to improve the signal-to-noise ratio of the camera,as well as the image signal-to-noise ratio,so as to improve the weak target detection ability.At the same time,a TDI accumulation output and single pixel output automatic selection scheme is proposed to solve the problem of system dynamic range reduction caused by uneven accumulation.Based on the observation image requirements,a method for normalizing the output response of the detection system was proposed.Finally,the correctness of the system design method was verified through experimental testing.

关 键 词：点目标 相机信噪比 图像信噪比 TDI红外探测器 动态范围 

分 类 号：TN219[电子电信—物理电子学] TN29