随着对空间信息获取能力的要求不断提高, 使得高分辨率动态遥感成为空间光学领域一个新的研究热点。偏视场同轴三反光学系统具有长焦距、体积小、轻量化程度和成像质量高等特点, 能够满足低轨视频卫星高分辨率、多谱段、多功能性和低成本的要求, 因此在高分辨率动态遥感领域有着广泛的应用前景。以高斯光学和三反射消像差理论为基础, 设计了可见光面阵成像、近红外和中红外线阵推扫成像的共孔径光学系统。可见光系统焦距4.1 m, 近红外系统焦距2.6 m, 中红外系统焦距1.85 m, 三者孔径均为520 mm, 视场均为0.6°×0.6°, 成像质均接近衍射极限, 成像质量良好。系统总长小于f′visible/3.7, 且系统的加工和装配公差较为宽松, 易于实现。

With the increasing requirement of space information acquisition ability, the dynamic high-resolution remote sensing has become a new hotspot research in space optical fields. The field-bias coaxial three-mirror optical system has the advantage of long focal length, small volume, high level of lightweight and high quality image, which can satisfy the high-resolution, multi-spectrum, versatility and low cost requirement for the LEO video satellite, so it is widely used in the field of the dynamic high-resolution space sensing field. Based on the Gaussian optics and three-mirror aberration theory, the common aperture optical system with area array imaging in visible spectrum and linear push-broom imaging in NIR and MIR spectrum was designed. The focal length for visible spectrum is 4.1 m, the focal length for NIR spectrum is 2.6 m and the focal length for MIR spectrum is 1.85 m, the aperture of three systems is 520 mm, field of view is 0.6°×0.6°. The optical structure is convenient for area array imaging, and the imaging quality of the optical system approaches the diffraction limit. The total length of the optical system is less than f′visible/3.7, and is easily implemented because of the relatively loose tolerance about processing and assembling.