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Geostationary orbit satellite with chamfered hood camera real-time sunlight avoidance method

A technology of geostationary orbit and hood, applied in the direction of attitude control, etc., can solve the problems of inaccessibility, achieve the effects of small maneuvering path, stable attitude maneuvering, reducing task intensity and the risk of injecting errors

Active Publication Date: 2019-03-19
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 with chamfered hood camera real-time sunlight avoidance method
  • Geostationary orbit satellite with chamfered hood camera real-time sunlight avoidance method
  • Geostationary orbit satellite with chamfered hood camera real-time sunlight avoidance method

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Experimental program
Comparison scheme
Effect test

Embodiment

[0079] For a satellite in geostationary orbit:

[0080] Orbit Epoch 23 Dec 2015 02:50:00

[0081] Semi-permanent axis (km): 42164.238885703373

[0082] Eccentricity: 0.003534077386388930

[0083] Orbit inclination (degrees): 0.0026285532110204346

[0084] Ascending node right ascension (degrees): 154.3

[0085] Argument of perigee (degrees): 100.07

[0086] Mean anomaly (degrees): 0.005

[0087] alpha fs_d : 0.0 degrees

[0088] Calculate according to the steps given above, the calculation steps are as follows:

[0089] (1) In the upright flight state, the solar orbital coordinate So=[Sox, Soy, Soz]=[-0.000251113, 0.397644, -0.917540]; calculate α independently according to the formula fs

[0090]

[0091] At this time α fs >α fs_d =0.0°; so avoid sunlight at noon;

[0092] (2) set the current offset four-element q_tc=[0001], thus the maneuvering four-element qtcon=[0010] for sunlight avoidance can be calculated;

[0093] (3) In the state of inverted flight, fr...

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Abstract

The invention relates to a geostationary orbit satellite with chamfered hood camera real-time sunlight avoidance method. An on-orbit satellite can autonomously perform noon and midnight sunlight avoidance, and the time and the beginning point of the noon sun avoidance can be controlled on the ground; the method can ensure that before and after the sunlight avoidance, a ground target pointed by a camera does not change; the shortest avoidance trajectory can be designed reasonably and effectively according to the direction of the sun in the four seasons to minimize the use of a momentum wheel; for the midnight sunlight evasion, different fitting curves are designed to effectively avoid and control the singular problems which may exist; cooperating with an autonomous time forecasting functionhelps ground monitoring and control personnel analyze the current time whether it is suitable for imaging tasks or position protection and the like, and it is ensured that there is no timing conflicts between different tasks. The entire method is widely practical and has certain application prospects.

Description

technical field [0001] The invention belongs to the field of spacecraft attitude and orbit control, and relates to a method for avoiding sunlight in real time with a camera in a spherical geostationary orbit equipped with an oblique hood camera. Background technique [0002] The main payload of the remote sensing satellite in geostationary orbit is the camera, which needs to avoid the sun at midnight when it is in orbit to avoid the sun's exposure to the lens. For the use of a flat-mouth sunshade, the sun can be avoided by rotating the satellite body around the rolling axis. No matter how the flat lens hood avoids sunlight, it cannot be avoided that the sunlight hits the inner wall of the lens hood at a certain angle, resulting in a high thermal design cost of the camera and an increase in the weight of the load. [0003] But for satellites in geostationary orbit, the sun's altitude angle relative to the orbit changes throughout the year, and the orientation of the sun rela...

Claims

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Application Information

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Patent Type & Authority Applications(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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