Geostationary Orbit Satellite Has Slanted Gobo Camera Real-Time Sun Avoidance Method

A geostationary orbit, hood technology, applied in attitude control and other directions, can solve problems such as inability to obtain, and achieve the effects of mitigating angular momentum fluctuations, reducing mission intensity and the risk of injection errors, and stable attitude maneuvers

Active Publication Date: 2022-01-04
BEIJING INST OF CONTROL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the existing literature, it is impossible to know what strategies foreign similar satellites adopt to meet this requirement

Method used

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  • Geostationary Orbit Satellite Has Slanted Gobo Camera Real-Time Sun Avoidance Method
  • Geostationary Orbit Satellite Has Slanted Gobo Camera Real-Time Sun Avoidance Method
  • Geostationary Orbit Satellite Has Slanted Gobo Camera Real-Time Sun Avoidance Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0079] For a satellite in geostationary orbit Earth:

[0080] Track epoch at 2:23 on December 2015 Ri 50 minutes 0.0 seconds

[0081] Often half shaft (km): 42164.238885703373

[0082] Eccentricity: .003534077386388930

[0083] Orbital inclination (degrees): .0026285532110204346

[0084] RAAN (degrees): 154.3

[0085] Perigee (degrees): 100.07

[0086] Mean Anomaly (degrees): 0.005

[0087] alpha fs_d : 0.0 degrees

[0088] It is calculated according to the step given above, the following calculation steps:

[0089] (1) is flying in the state, the solar orbit coordinates So = [Sox, Soy, Soz] = [- 0.000251113,0.397644, -0.917540]; autonomic calculated according to the equation α fs

[0090]

[0091] At this time, α fs > α fs_d = 0.0 °; therefore avoid the sun at noon performed;

[0092] (2) setting the bias current of the four elements q_tc = [0001], whereby four calculated motor element qtcon sun avoidance = [0010];

[0093] (3) in the inverted state, by a solar orbit coordinat...

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Abstract

The invention relates to a real-time sunlight avoidance method for a geostationary orbit satellite with an oblique shading camera, which can autonomously avoid the sun at noon and midnight every day in orbit, and the time starting point for avoiding the sun at noon is controllable on the ground; at the same time, the technology can ensure the sun. Before and after avoidance, the ground target pointed by the camera will not change; and according to the direction of the sun in the four seasons, the shortest avoidance trajectory can be reasonably and effectively designed to minimize the use of momentum wheels; for midnight sun avoidance, different fitting curves are designed, Effectively avoid possible singular problems in the control; cooperate with the autonomous time forecast function to help ground measurement and control personnel analyze the current moment, whether it is suitable for imaging tasks or position protection and other related operations, and ensure that different types of tasks conflict in timing. The whole design scheme has wide practicability and has a certain application prospect.

Description

Technical field [0001] The invention belongs to orbit spacecraft attitude control, and relates to one kind of ball geostationary orbit satellite has a chamfered hood camera in real time the sun workaround. Background technique [0002] Main load geostationary orbit satellites for remote sensing camera in orbit around midnight when the need to avoid the sun, avoid sun exposure problem of the lens. For use flat hood, rotatable about the roll axis of the satellite by sun avoidance star. No matter how flat hood to avoid the sun, can not always avoid the sun at an angle to irradiate the inner wall of the hood, resulting in higher cost of the thermal design of the camera, while the weight of the load has increased. [0003] But for geostationary satellites, the elevation angle relative to the sun throughout the year in track changes orbit around the sun relative to the orientation of the body is changing, so it is necessary to take measures to make the most of the sunlight from the bev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D1/08
Inventor 乔国栋刘新彦宗立森黎康
Owner BEIJING INST OF CONTROL ENG
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