交会对接成像敏感器成像参数设计

Design of Imaging Parameters for RVD Image Sensor

基于交会对接成像敏感器在轨成像目标相对距离变化较大的特性,分析了敏感器嵌入式软件对曝光积分时间、激光发光功率等各项成像参数配置的方法。针对有先验数据、无先验数据初始捕获、跟踪模式等三个不同的工作模式特性与模式切换逻辑,设计了一种初始捕获参数试配方法,并将其与跟踪模式下的最优化参数实时计算相结合,形成了完整的交会对接成像敏感器成像参数设计方案,并进行了仿真测试,结果表明该方法能够有效确保在轨实时图像清晰度满足位姿测算要求,可为交会对接末段制导相对位姿测算提供保障。该方法拟应用于我国后续交会对接任务中。

Based on the dramatic changes of interact distance between the two spacecrafts during the process of Rendezvous and Docking（ RVD）,the software strategy to determine the imaging parameters such as the integral exposure time and the laser power was analyzed. There were 3 different work modes including the initial capture with or without priori data modes and the trace mode. A new adaption method was proposed targeting the different characteristics of the 3 work modes of the embedded software and the switching strategy. A method for designating the imaging parameters of RVD image sensor was given and it was combined with the real-time algorithm of the parameters for the track mode. The numerical simulation results showed that the new method could ensure the clarity of the real-time RVD terminal guidance image on-orbit. The method may be used in future RVD tasks in China.