星地激光通信ATP系统探测相机的坏点校正  

Defective Pixel Correction of Spot-Detecting Camera in Satellite-to-Ground Laser Communication ATP System

作　　者：钱锋[1] 贾建军[1] 张亮[1] 王建宇[1] 

机构地区：[1]中国科学院上海技术物理研究所空间主动光电技术重点实验室,上海200083

出　　处：《中国激光》2014年第5期133-139,共7页Chinese Journal of Lasers

基　　金：中国科学院知识创新工程重大项目(KGCX1-YW-16)

摘　　要：阐述了星地激光通信捕获、跟踪、瞄准(ATP)系统中光斑探测相机的作用。当相机的探测器上存在坏点时,光斑探测相机的虚警率和定位精度将受到影响。分析了面阵探测器的坏点种类与来源以及星地激光通信ATP系统光斑探测相机的特点。依据相机的特点提出了对应的实时坏点检测及校正方法。设计了基于STAR1000探测器的光斑探测相机,并在该相机中应用了实时坏点校正方法。对该校正方法进行了实验验证,实验结果表明该算法能够有效抑制坏点像元,并纠正其灰度值。由于该校正方法处理延时小且能够有效降低存在坏点时相机的定位误差,非常适用于星地激光通信ATP系统。The function of spot-detecting camera in satellite-to-ground laser communication acquisition, tracking, pointing （ATP） system is expounded. When defective pixels exist on the detector, the false alarm rate and positioning accuracy of spot-detecting camera will be affected. The kinds and sources of defective pixels on matrix detector are analyzed. The characteristics of spot-detecting camera in satellite-to-ground laser communication ATP system are also analyzed. According to these characteristics of camera, the real time method of defective pixel check and correction is explained. A spot-detecting camera based on STAR-1000 sensor is designed, which also uses the correction method. Some tests are carried out to verify the correction method. The results show that the real time correction method can restrain defective pixels effectively and the gray value of defective pixels will be corrected. Because this method has short delay and it can reduce the positioning error when the camera has defective pixels, it cna well apply to the satellite-to-ground laser communication ATP system.

关 键 词：光通信 坏点校正 梯度检测 ATP系统 

分 类 号：TN929.1[电子电信—通信与信息系统]