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A Sunlight Avoidance Attitude Planning Method for Optical Satellite Phased Array Data Transmission Mission

An optical satellite and phased array technology, applied in the aerospace field, can solve the problems of camera failure, focal plane detector coating damage stability, affecting the service life of the camera, etc., to achieve the effect of improving the service life of the on-orbit

Active Publication Date: 2022-02-11
CHANGGUANG SATELLITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the data transmission task of staring posture, the sunlight incident on the camera or the angle between the camera and the camera will be small, which will not only cause damage or decrease the stability of the coating on the surface of the focal plane detector or optical mirror, but also increase the The temperature rise of the inner wall of the camera lens barrel will cause the risk of material degradation and contamination of the camera lens. In severe cases, it will even affect the service life of the camera on orbit or cause the camera to fail

Method used

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  • A Sunlight Avoidance Attitude Planning Method for Optical Satellite Phased Array Data Transmission Mission
  • A Sunlight Avoidance Attitude Planning Method for Optical Satellite Phased Array Data Transmission Mission
  • A Sunlight Avoidance Attitude Planning Method for Optical Satellite Phased Array Data Transmission Mission

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Experimental program
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Effect test

Embodiment 2

[0095] The satellite simulation orbit parameters implemented by this patent are as follows:

[0096] Orbit type: Sun-synchronous orbit.

[0097] Orbit height: 535.35km.

[0098] Descending node local time: 11:30AM.

example 1

[0100] Data transmission start time: 641493087 (12:31:27 on April 30, 2020, Beijing time);

[0101] Data transmission time: 632 seconds.

[0102] Phased array maximum beam angle: 60°.

[0103] The location of the virtual data transmission station: longitude 110.189°, latitude 41.0451°, height 0m.

[0104] Satellite WGS84 position (m) at the start of data transmission: [-1606925.8, 2999967.7, 6017830.7].

[0105] Satellite WGS84 speed (m / s) at the start of data transmission: [-1004.589, 6688.393, -3602.505]. Comparing the traditional gaze attitude and the planned attitude during the phased array digital transmission, the quaternion of the expected coordinate system relative to the J2000 system under the two phased array digital transmission attitudes is as follows: image 3 .

[0106] The angle and difference between the optical axis of the camera and the sunlight under the two attitudes of phased array digital transmission are as follows Figure 4 .

[0107] The simulati...

example 2

[0109] Data transmission start time: 659985344 (Beijing time at 13:15:44 on November 30, 2020).

[0110] Data transmission time: 624 seconds.

[0111] Phased array maximum beam angle: 70°.

[0112] Virtual data transmission station location: longitude 95.1138°, latitude 53.4442°, height 0m.

[0113] Satellite WGS84 position (m) at the start of data transmission: [-991897.472, 1985971.071, 6547393.436].

[0114] Satellite WGS84 speed (m / s) at the start of data transmission: [-12.387464, 7330.337414, -2225.332154].

[0115] Comparing the traditional gaze attitude and the planned attitude during the phased array digital transmission, the quaternion of the expected coordinate system relative to the J2000 system under the two phased array digital transmission attitudes is as follows: Figure 5 .

[0116] The angle and difference between the camera optical axis and the sunlight under two phased array digital transmission attitudes are as follows: Figure 6 .

[0117] The simul...

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Abstract

The invention discloses a method for planning an attitude avoidance of sunlight for an optical satellite phased array data transmission task. Step 1: Calculate the vector pointing from the satellite to the sun and the vector from the satellite to the ground data transmission station in the WGS84 system during the data transmission; Step 2: Calculate the unit normal vector of the plane where the two vectors are located; Step 3: Use the phased array The ability of the antenna to perform data transmission within the maximum beam angle range. The unit normal vector is used as the rotation axis to make the vector of the satellite pointing to the ground data transmission station rotate within the maximum beam angle range. The rotated vector is the satellite in the WGS84 system. The expected vector under the following; Step 4: Calculate the expected attitude under the J2000 system during the satellite data transmission period through the position vector of the satellite in the WGS84 system, the expected vector and the conversion matrix from the WGS84 system to the J2000 system. The invention realizes the function that the satellite camera can avoid the incidence of sunlight at the largest angle during the phased array digital transmission process.

Description

technical field [0001] The invention belongs to the technical field of aerospace, in particular to a method for planning a sunlight avoidance attitude for an optical satellite phased array data transmission task. Background technique [0002] Optical satellites are satellites that perform imaging through optical systems, and their phased array data transmission tasks generally use the traditional staring data transmission attitude. During the data transmission task of staring posture, the sunlight incident on the camera or the angle between the camera and the camera will be small, which will not only cause damage or decrease the stability of the coating on the surface of the focal plane detector or optical mirror, but also increase the The temperature rise of the inner wall of the camera lens barrel will cause the risk of material degradation and contamination of the camera lens. In severe cases, it will even affect the service life of the camera in orbit or cause the camera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64G1/24
CPCB64G1/244B64G1/245
Inventor 童鑫戴路曲友阳沈莹刘洁冰
Owner CHANGGUANG SATELLITE TECH CO LTD
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