A control method for a low-orbit satellite with two degrees of freedom for solar wings

Abstract

One embodiment of the present invention discloses a low-orbit satellite dual-degree-of-freedom solar wing control method, including: S1: Acquiring the angular velocity of the satellite, and judging whether the absolute value of the angular velocity is greater than a speed threshold, and if greater, the solar wing's S5 is performed after the control commands of the rotation axis and the swing axis are set to stop and maintain the command, otherwise S2 is performed; S2: obtain the sun vector under the satellite body system, and convert it to the orbital coordinate system; S3: calculate the orbital plane and the sun vector The angle between the vectors, and judge whether the absolute value of the angle is less than the angle threshold, if less, set the solar wing to continuous sun tracking control, otherwise set it to a fixed angle sun tracking control; S4: judge the sun Whether the wing rotation axis and the swing axis are controlled at the same time, if they are controlled at the same time, go to S5, otherwise adjust the command of the rotation axis; S5: output the control commands of the rotation axis and swing axis to control the movement of the solar wing.

Description

technical field [0001] The invention relates to the technical field of spacecraft control. More specifically, it relates to a method for controlling a two-degree-of-freedom solar wing of a low-orbit satellite. Background technique [0002] Internet access anytime, anywhere is the most important feature of the current information age. Many foreign companies such as OneWeb and SpaceX have proposed large-scale low-orbit broadband satellite constellation systems, planning to provide Internet access services anytime, anywhere for the world. [0003] Low-orbit broadband satellites need to adopt non-sun-synchronous orbits, resulting in periodic and large-scale changes in the angle between the sun and the orbital plane. When the sun shines on the orbital plane vertically, the solar wings on the vertical orbital plane cannot obtain energy. Therefore, if a satellite in a non-sun-synchronous orbit is only equipped with a single-degree-of-freedom solar wing, in order to realize the sol...

AI Technical Summary

Problems solved by technology

[0003] Low-orbit broadband satellites need to adopt non-sun-synchronous orbits, resulting in periodic and large-scale changes in the angle between the sun and the orbital plane. When the sun shines on the orbital plane vertically, the solar wings on the vertical orbital plane cannot obtain energy

Therefore, if a satellite in a non-sun-synchronous orbit is only equipped with a single-degree-of-freedom solar wing, in order to realize the solar wing's orientation to the sun, the satellite needs to perform periodic large-angle attitude maneuvers, which will cause the satellite's working process to be periodically interrupted, and The periodic attitude maneuver of the satellite destroys the existing attitude stability. After the maneuver is completed, the stable attitude needs to be re-established, which will also bring the risk of uncertainty to the satellite attitude control system.

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