Around moon satellite dual spindle antenna direct land control method

Abstract

The invention discloses a method for controlling the pointing to the ground of the coaxial antenna of a lunar satellite. The method includes the following steps: first, according to earth ephemeris information transmitted from the ground to the satellite and a transformation matrix from an equatorial inertia system to a coordinate system of a satellite orbit, the ephemeris of the earth in the coordinate system in the satellite orbit in any moment is calculated ; second, according to the calculated ephemeris, visible earth region of the satellite is calculated and within the visible region, a pointing in the coordinate system of the satellite orbit of vector about the satellite pointing to geometer is calculated; the pointing in the coordinate system of the satellite orbit of vector about the satellite pointing to geometer is calculated in a compensated way to obtain the pointing in the coordinate system of the satellite body of vector about the satellite pointing to geometer; according to the pointing in the coordinate system of the satellite body of vector about the satellite pointing to geometer, an antenna target angle is calculated; a final instruction angle is obtained after an antenna zero deviation is compensated and the final instruction angle is sent to an antenna drive mechanism which can drive the antenna to point to the earth. The invention overcomes the defects of the prior art and adopts a tracking mode of a simple ring-opening program to meet the requirements for pointing accuracy.

Description

technical field [0001] The invention relates to a method for controlling the ground-pointing of a biaxial antenna used in a lunar orbiting phase of a moon orbiting satellite. Background technique [0002] The dual-axis antenna is an important component to complete the download of payload information from the orbiting satellite. The control system needs to control the rotation of the antenna along two axes, and obtain the position information of the antenna to ensure the pointing accuracy of the antenna to the ground. [0003] Dual-axis antennas have been researched and applied in foreign relay satellites and communication satellites. For example, the KSA satellite antenna positioning system on Japan's EST-VI satellite and the DRRS satellite antenna positioning system developed by Matra Marconi are all dual-axis antennas. control. The control methods include: PI control, LQG plus feedforward control, LQG / LTR method, fuzzy PID and adaptive control methods. These methods are...

AI Technical Summary

Problems solved by technology

At present, the dual-axis antenna pointing control of domestic satellites adopts the control method of program tracking. The target orbit is a segmented orbit obtained by ground processing, and the satellite searches for the target after scanning. The control logic of this method is complicated. A feedback device is required, which can feed back target information in real time, and perform closed-loop pointing control of the antenna through the calculation of the on-board control law

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