基于离轴三反的前置望远系统, 结合分振幅同时偏振成像技术, 设计了一种运用于卫星平台环境的高空间分辨率的同时偏振成像仪, 能同时获取目标的斯托克斯偏振参数, 为抑制海面耀光、海雾、大气辐射等干扰, 提升探测目标对比度提供了一种有效手段, 在进行动态目标探测方面具有明显优势。并以光学设计为输入进行详细结构设计。最后通过实验室整机性能测试, 仪器的工作谱段500~700 nm, 视场角8.5°×0.1°, 空间分辨率为5 m@500 km, 光学MTF>0.4@71.4 lp/mm, 在高度角30°、反射率0.2的条件下, 信噪比优于38 dB, 偏振测量精度优于1%(P≤0.3),整机一阶模态195 Hz, 结构能够承受发射时严苛的力学环境, 具备良好的强度和刚度。整机性能满足实际使用需求。

A kind of simultaneous imaging polarimeter with a high spatial resolution for satellite platform environments was designed which was based on an off-axis three-mirror system as front-view telescope system and combined with simultaneous-amplitude polarization imaging technology, and the simultaneous polarization imager was designed to simultaneously acquire the target Stokes parameters to suppress sea surface glare, sea fog, atmospheric radiation and other disturbances. It provided an effective means to improve the contrast of detection targets, and had obvious advantages in dynamic target detection. According to the optical system, the detailed structural design had been finished. Finally, through the laboratory performance test, the working spectrum was 500-700 nm, the FOV was 8.5°×0.1°, the spatial resolution was 5 m@500 km, the optical MTF was more than 0.4@71.4 lp/mm, and under the condition of an elevation angle of 30° and a reflectivity of 0.2, the noise ratio was better than 38 dB, the polarization measurement accuracy is better than 1%(P≤0.3), the first-order mode of the whole machine was 195 Hz, and it had good strength and stiffness. The overall performance meets the actual use requirements.