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Joint Control Method of East-West Position Preservation and Angular Momentum Unloading

A technology of angular momentum unloading and joint control, which is applied in three-dimensional position/course control and other directions, and can solve the problem of occupying mission time and so on

Active Publication Date: 2016-11-30
BEIJING INST OF CONTROL ENG
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Problems solved by technology

If the effects of the earth's non-spherical perturbation, solar light pressure perturbation, and angular momentum unloading are not considered comprehensively, unreasonable selection of unloading time, and reasonable selection of thrusters, in order to overcome the impact of angular momentum unloading on satellite orbits, more propulsion will be consumed agent for satellite orbit maintenance and takes up more mission time

Method used

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  • Joint Control Method of East-West Position Preservation and Angular Momentum Unloading

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Embodiment

[0101] For a certain satellite, the mass of the satellite is m=2366.1kg, and the effective area A of the solar radiation of the satellite is eff =26.335m 2 , fixed at 112° east longitude, the interference force caused by the solar light pressure on the +Y plane of the satellite is smaller than that on the -Y plane, and the angular momentum ΔH=30.4Nms accumulated every day.

[0102] (1) According to the fixed-point position of the satellite, determine the non-spherical perturbation of the earth on the satellite, and further determine the daily variation ΔD of the flat longitude drift rate caused by the perturbation of the earth E =-0.0020° / d;

[0103] (2) According to the satellite structure and quality, determine the solar light pressure perturbation on the satellite, and obtain the components of the eccentricity change rate vector in the X and Y directions of the geocentric inertial coordinate system

[0104] e · ...

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Abstract

The joint control method of east-west position keeping and angular momentum unloading firstly analyzes the influence of geospherical perturbation and solar light pressure perturbation on satellite orbits for geostationary orbit satellites, and at the same time estimates the impact of angular momentum unloading on satellite orbits; then, Compare the effects of the earth's non-spherical perturbation and angular momentum unloading on the longitude drift rate, and determine the unloading time; and consider the impact on eccentricity, eliminate the possibility of multiple solutions at the unloading time, and determine the optimal unloading time, which is beneficial to the east-west position Keep, and make the eccentricity as small as possible. The method of the invention is suitable for geostationary orbit satellites that need to use thrusters to unload angular momentum intensively. Using the method described in the invention helps to reduce the times of maintaining the east-west positions, save propellant, increase the mission time of satellites, and prolong the service life of satellites.

Description

technical field [0001] The invention relates to a combined control method for east-west position keeping and angular momentum unloading, and belongs to the technical field of geostationary orbit satellite orbit maintenance. Background technique [0002] Most satellites in geostationary orbit, especially communication satellites, detect that the angular momentum exceeds a certain threshold according to the measurement of the rotational speed of the momentum wheel, and then perform jet unloading. Geostationary orbit navigation satellites and earth observation satellites have strict restrictions on jet. This type of satellite uses momentum wheels to absorb the angular momentum generated by interference such as solar light pressure, and performs centralized unloading when unloading is allowed or when the maximum envelope of angular momentum is reached. [0003] Other than geostationary orbit satellite orbit maintenance design, little consideration is given to the impact of angu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D1/10
Inventor 汤亮陈守磊刘一武胡少春郭廷荣
Owner BEIJING INST OF CONTROL ENG
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