The in-orbit defocus of the long focal length high-resolution space optical camara has a complicated defocus variation and lasts for a long time based on cyanate resin matrix composites material optical-mechanical structure design, the camera’s refocusing decision in-orbit cannot rely on a single mode in its operational stage on orbit. Based on the theory of composite characteristics and focusing mechanism of space camera, this paper analyzes and builds the camera's in-orbit parametric defocusing model. Comprehensively considers the actual resource usage of the satellite in each stage of operation and user application requirements, a phased on-orbit refocusing strategy is studied and designed. Taking a long focal length and large aperture high-resolution camera designed of cyanate resin matrix composites material with the secondary mirror adjustment mode as an example, using focusing data in the initial in-orbit commissioning period, the defocusing model parameters were determined through fitting and optimizing, and the trend analysis and prediction of camera focus position changes were carried out according to the defocusing mathematical model. And the camera refocusing position tracking and presetting were completed based on the trend prediction during the satellite service phase, and obvious results on image quality were achieved.
Observation target characters can be truly reflected by multi-type sensor detect with multi-source information fusion, processing and comparison. Based on the design and application requirement of multi-type sensor for low inclination orbit satellite(hereinafter called LIO), the study on optical remote sensor’s imaging performance is carried out in this paper for LIO satellite. Due to the complex precession of the orbit, the imaging characteristics are analyzed and compared with the sun synchronous orbit including solar elevation angle, radiance at the entrance pupil, SNR, revisit period, satellite illumination azimuth angle and the angle between sun vector and bore sight vector. According to the analysis results, conclusions on optical remote sensors imaging performance of LIO can be drawn in the imaging dynamic, radiance performance, revisit efficiency, sunlight avoiding and thermal control design. The study provides a reference for the low inclination orbit satellite general design and optic remote sensor development.
Recently launched spaceborne remote sensors with short-wave infrared (SWIR) spectrum were introduced. Sketch and benefits of uncooled or thermoelectric (TE) cooling linear InGaAs detector were analyzed. A remote sensing imaging system with visible and SWIR spectrums using CCD and InGaAs detectors in one optical system was modeled and calculated. The application of SWIR spectrum was proposed.
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