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East-west position keeping and angular momentum unloading combined control method

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

Active Publication Date: 2014-07-23
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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  • East-west position keeping and angular momentum unloading combined control method
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  • East-west position keeping and angular momentum unloading combined control method

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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

An east-west position keeping and angular momentum unloading combined control method includes: first, analyzing effects of earth non-spherical perturbation, solar radiation pressure perturbation and the like on a satellite orbit and received by a static orbit satellite, meanwhile estimating the effect of angular momentum unloading on the satellite orbit, then comparing effects of the earth non-spherical perturbation and the angular momentum unloading on the flat longitude drift rate to determine the unloading moment, considering the effect on the eccentricity ratio, and eliminating the possibility of multiple solutions at the unloading moment to determine the optimum unloading moment. The method is favorable for east west position keeping and enables the eccentricity rate to be small as much as possible. The method is applicable to the static orbit satellite needing a thruster to unload the angular momentum in a centralizing mode. By means of the method, the east west position keeping times can be reduced, a propellant is saved, the satellite task time is increased, and the service life of the satellite is prolonged.

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 Applications(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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