On-orbit autonomous earth shadow calculation method and system for geostationary orbit satellite

Abstract

The invention provides an in-orbit autonomous earth shadow calculation method and system for a geostationary orbit satellite. The method comprises the steps that S1, the radius of an earth shadow area disc is calculated according to a solar disc field angle and an earth disc field angle; s2, according to the longitude of the sub-satellite point at the fixed-point position of the satellite, calculating the accumulated second number of the midnight moment of the satellite relative to the Greenwich time; s3, calculating the solar altitude at the midnight moment according to the accumulated second number of the midnight moment of the satellite relative to the Greenwich time; s4, according to the radius of the disc in the earth shadow area and the solar altitude at the midnight, calculating the solar crossing angle in the earth shadow period; and S5, according to the angle crossed by the sun during the earth shadow period, calculating the earth shadow duration of the satellite and the time when the satellite enters and exits the shadow, and judging the earth shadow area. The method does not depend on ground control processing, earth shadow judgment is autonomously completed in orbit, and satellite energy crisis and safety problems caused by underreporting of a ground system are avoided.

Description

technical field [0001] The invention relates to the overall technology and the test and testing technology of space vehicles, and in particular, to a method and system for calculating the on-orbit autonomous ground shadow of a geostationary orbit satellite. Background technique [0002] During the orbit of the satellite around the earth, when the earth is between the sun and the satellite and the three are exactly in a straight line, the earth will block the light from the sun to the satellite, so the shadow of the earth will be cast on the satellite to form an earth shadow, as shown in the appendix. figure 1 shown. Due to the different conditions of the sun at the location of the satellite, the earth shadow area can be divided into full shadow area, penumbra area and annular shadow area. figure 1 As shown in the figure, A is a schematic diagram of the full shadow area, B is a schematic diagram of the penumbra area, and C is a schematic diagram of the annular shadow area. ...

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Problems solved by technology

[0007] Zhu Xinghong, Miao Yuanqing, Yuan Shigeng, in the article "Optimization of Moon Shadow Event Prediction of Low-orbit Satellites" in Journal of Aircraft Measurement and Control, Volume 35, No. 2 (April 2016), proposed an The optimal forecasting method for moon shadow events of low-orbit satellites reduces the frequency of moon shadow forecasts from onc...

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