地球静止轨道凝视红外相机抖动引起杂波研究  

Study on Dither-caused Clutter for Staring Infrared Camera in Geostationary Orbit

作　　者：卞铂渊 周峰[1] 李晓曼[1] 晋利兵 宫辉[1] 练敏隆[1] BIAN Boyuan;ZHOU Feng;LI Xiaoman;JIN Libing;GONG Hui;LIAN Minlong(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《红外技术》2023年第7期775-783,共9页Infrared Technology

摘　　要：对于地球静止轨道凝视红外相机,相机视线抖动引起的杂波是背景特征、相机参数、相机视线抖动特性和背景抑制算法等因素综合影响的结果。为了定量化评估视线抖动引起杂波的强度,综合考虑抖动频谱、探测器积分时间、帧周期和帧间差分背景抑制算法这几项时间相关因素,将它们合并为与背景无关的抖动等效角,建立了抖动等效角与背景辐射强度梯度统计量相乘形式的抖动引起杂波模型。基于相机视线抖动特性地面测量实验,分析了制冷机和动量轮引起的相机视线抖动频谱,对视线抖动引起的杂波进行了仿真模拟和模型计算,验证了理论模型。结果显示,所建立的抖动引起杂波模型计算结果与仿真模拟结果的相对偏差小于15%,具有较好的通用性和高效性,适用于相机设计的迭代优化。For a staring infrared camera in geostationary orbit,the dither-caused clutter results from the combined effects of background features,camera parameters,camera line-of-sight dither characteristics,and background suppression algorithms.To quantitatively evaluate the intensity of dither-caused clutter,several time-related factors,such as the dither spectrum,detector integration time,frame period,and interframe differential background suppression algorithm are considered.They are combined into a backgroundindependent dither-equivalent angle,and the model of dither-caused clutter is established by multiplying the dither-equivalent angle and gradient statistics of the background radiation intensity.Based on ground measurement experiments on the camera line-of-sight dither characteristics,the spectrum of the camera lineof-sight dither caused by the cryocooler and momentum wheels are analyzed.The dither-caused clutter is also simulated and calculated to verify the theoretical model.The results show that the relative deviation between the calculated and simulated results was less than 15%.This indicates the high versatility and efficiency of the of model,which is suitable for the iterative optimization of camera design.

关 键 词：地球静止轨道 凝视红外相机 抖动等效角 抖动引起杂波 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]