KEYWORDS: Cameras, Temperature control, Design, Star sensors, Signal to noise ratio, Mirrors, Image quality, Remote sensing, Thermal stability, Control systems
A high image quality light-small remote sensing camera design conception is proposed to satisfy the requirement of the high resolution, light weight and high image quality commercial applications. Adopting three mirrors reflection coaxial optical system, combined with light weight, high stable opto-mechanical and TDICMOS imaging circuits, is achieving the design result of 80Kg weight and 150watt power consumption. and acquires images through push-broom mode. To achieve the high SNR, the Precision Loop Heat Pipe (LHP) is adopted to keep the TDICMOS sensor operating under stable and low temperature, and the fixed pattern noise is statistically analyzed in the lab and then removed by onboard processor in real time. For MTF, Modulation Transfer Function Compensation (MTFC) algorithm is used to improve the final MTF value. The interior orientation elements stability is achieved by dedicated design of reflection mirror and its supporting structure, and indirect high precision thermal control for opto-mechanical structure. The star sensor brackets are directly mounted on the primary camera structures, meanwhile, the thermal and stiffness performance of which is specially designed to keep the exterior orientation elements stable. The final design gives the result of the 48dB for SNR, 0.15 for static MTF and high geometrical stability.
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.
Mars is the most similar planet as the Earth in the solar system. So it is the most studied planets in the solar system. U.S.A., Russia and E.U. have launched more than 43 satellites or spacecraft. China has realized to surround and land on the Moon, but has never been to explore Mars.
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