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In the application scenarios of high dynamic natural disasters such as earthquakes, volcanoes, tsunamis and hurricanes, the spectral information and time sensitivity of detection images are required to be high. This paper discusses the background of multi-source information detection of optical SAR and the progress of integrated technology, compares and analyzes the characteristics of the existing integrated technology system, and puts forward a new optics and SAR coaperture Imaging System. The SAR payload part uses light and small planar phased array antenna, which has excellent performance, but as part of an integrated system, and there is no matching optical system. Therefore, a new optical imaging scheme is proposed. Using a flat-plate grating primary mirror and a SAR detection mechanism in parallel layer in the aperture direction, so as to embed a planar phased array antenna in the optical system. The system can realize the co-aperture coupling matching between optical load and radar load detection area without affecting the reception of each signal. The planar grating primary mirror realize optical folding while realizing large equivalent aperture, and provide spectral resolution. The system is small in size and light in weight, which can save more platform space and provide theoretical basis and technical support for the application of optical-SAR image fusion in orbit.
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