晨昏轨道微光相机成像策略研究及仿真验证

Simulation and Verification of Imaging Strategy for Low-light-level Camera on Dawn-dusk Orbit

为满足晨昏轨道微光相机大动态范围成像要求,针对EMCCD器件,提出一种微光相机成像策略。该策略通过对积分时间及电子倍增数的设计及选取,制定若干成像档位,相机成像过程中,利用文章中提出的图像灰度最大值法实时计算结果决定档位动作,实现微光相机成像参数实时调整。通过地面仿真及在轨验证,该策略能够保证微光相机在大动态范围内获取高信噪比、高品质图像,具有良好的实时性、鲁棒性和有效性。

In order to meet the requirement of large dynamic range imaging for low-light-level camera on dawn-dusk orbit, this paper proposes an imaging strategy for low-light-level camera based on EMCCD. The strategy formulates several imaging gears by designing and selecting the integration time and electron multiplier. During the imaging, gear switch was realized by the results of max image grey calculated in real time. According to the ground simulation and on-orbit validation, this strategy has better real-time, robustness and validity, which can produce high SNR and good images in large dynamic range.