空间CCD凝视成像跟踪系统的作用距离分析

在充分考虑了空间背景光辐射特性以及漫反射目标对相干光和自然光的不同反射特性的基础上,利用信号检测的统计学方法,导出了空间电荷耦合器件(CCD)凝视成像跟踪系统分别在激光照明主动跟踪模式和太阳光照明被动跟踪模式下的作用距离表达式。结果表明,空间CCD凝视成像跟踪系统在脉冲能量为1mJ的激光照明主动跟踪模式下可对1m2空间漫反射目标实现10km量级范围内的跟踪;而利用太阳光照明的被动跟踪模式下的跟踪距离可达几百千米。

Based on analysis of background radiations characteristic in space and the different reflection characteristic of diffuse target to the coherent light and natural light, through using statistical signal detection theory, the formula of working distance of space-borne charge coupled device (CCD) gaze imaging tracking system under laser illuminating active tracking mode and sun illuminating passive tracking mode are studied, respectively. The result indicates that the space-borne CCD gaze imaging tracking system can track 1 m² diffuse target in 10 km distance under 1 mJ pulse energy laser active tracking mode, and the working distance of sunlight passive tracking mode is as high as hundreds kilometers.