| Citation: | ZHANG Luping, CHEN Sheng, HU Moufaet al. Influence of earth-atmosphere radiation on imaging characteristics of space object[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(8): 1550-1557. doi: 10.13700/j.bh.1001-5965.2020.0256(in Chinese)
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To analyze the influence of earth-atmosphere radiation on imaging characteristics of space object, first, the visible light imager mounted on Geosynchronous Orbit (GEO) satellite was treated as an observation platform, and the motion scenes of Highly Elliptical Orbit (HEO) and Low Earth Orbit (LEO) objects were designed by the Satellite Tool Kit (STK). Then, the equivalent magnitude model of space object and earth-atmosphere background, and the calculation formulation for the Signal-to-Noise Ratio (SNR) of space object were derived by adopting infinitesimal method, according to the relative relationship among the space object, the sun, the earth and the observation platform. The effects of the distance and angle variables on the equivalent magnitude of different orbital objects and earth-atmosphere, as well as the SNR were analyzed. The simulation results indicate that the equivalent magnitude of earth-atmosphere background is lower than space object while the object is far away from the observation platform, which means that the earth-atmosphere radiation is stronger than the target signal. The observation window between the time when the earth-atmosphere radiation enters and leaves the target detecting field of view is the best time for target detection since the SNR is the largest. Moreover, the value of SNR obtained by simulation provides a theoretical calculation basis for the detection and recognition of space object.
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