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Data transmission attitude planning method for adaptively avoiding sun

A self-adaptive, attitude technology, applied in the aerospace field, can solve the problems of affecting the imaging quality of the camera on-orbit service life, the temperature rise of the inner wall of the camera lens barrel, and avoiding the incidence of sunlight.

Active Publication Date: 2021-09-14
CHANGGUANG SATELLITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the satellite structure in which both the camera and the phased array antenna coincide with the Z-axis of the satellite system, due to the characteristics of the gaze data transmission posture, the angle between the sun and the camera will be small during the execution of the data transmission task, causing the inner wall of the camera lens barrel to The temperature rise will affect the imaging quality and the service life of the camera in severe cases
Under the satellite structure where the camera and phased array antenna are installed offset, it is also impossible to avoid the incidence of sunlight in the full latitude range

Method used

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  • Data transmission attitude planning method for adaptively avoiding sun
  • Data transmission attitude planning method for adaptively avoiding sun
  • Data transmission attitude planning method for adaptively avoiding sun

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0063] according to Figure 1 to Figure 11 As shown, the present invention provides a method for adaptively avoiding the sun's digital transmission attitude planning, comprising the following steps:

[0064] Step 1: Determine the solar vector under the WGS84 system according to the solar vector under the J2000 system and the conversion matrix between the J2000 system and the WGS84 system;

[0065] The step 1 is specifically:

[0066] Step 1.1: Calculate the Julian day JD and the Julian century T using UTC:

[0067]

[0068]

[0069] Among them, year, month, and day represent Greenwich mean year, month, and day; hour, minute, and second represent UTC hours, minutes, and seconds; int() represents rounding;

[0070] Step 1.2: When the earth moves around the sun, determine the sun vector R in the J2000 coordinate system SJ , the ecliptic angle i and the solar longitude l are expressed by the following formula:

[0071] i=23°26′21.448″-46.8150″T-0.00059″T 2 (0.019993°-0....

specific Embodiment 2

[0107] Orbit type: sun-synchronous orbit; orbit altitude: 535km; descending node local time: 11:20am.

example 1

[0109] Arctic station: longitude 15.438°, latitude 78.227°, height 0m;

[0110] Simulation start time: 635918400 (16:00:00, February 25, 2020, Beijing time);

[0111] Satellite WGS84 position (km): [-83.999705 2694.171159 6365.991616];

[0112] Satellite WGS84 speed (km / s): [2.955540 -6.495626 2.788032];

[0113] Simulation duration: 600 seconds;

[0114] Phased array maximum beam angle: 60°;

[0115] The angular velocity, attitude angle, and the angle between the Z axis and the sun under the staring attitude and the adaptive avoiding the sun attitude are compared respectively. The angular velocity under the inertial system under the two digital transmission attitudes is as follows: image 3 As shown, the attitude angle of the orbit system is as follows Figure 4 As shown, the satellite attitude rotation angle is as follows Figure 5 As shown, the angle between the Z-axis of the satellite body system and the sunlight is as follows Image 6 shown.

[0116] From the simul...

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Abstract

The invention relates to a data transmission attitude planning method for adaptively avoiding the sun. The invention relates to the technical field of aerospace. The method comprises the steps: determining a sun vector under a WGS84 system according to a sun vector under a J2000 system and a conversion matrix between the J2000 system and the WGS84 system in a staring data transmission process of an optical remote sensing satellite to a ground station; determining an included angle between the sun vector and the flight direction of the optical remote sensing satellite according to the sun vector under the WGS84 system; and according to the angle of the incident sunlight, adaptively adjusting the staring data transmission attitude, and planning the data transmission attitude. According to the incident direction and the incident angle of the sunlight, the data transmission attitude of the satellite is adjusted in real time by using the electric scanning function of a phased-array antenna, so that the included angle between the camera and the sunlight during data transmission is kept more than 60 degrees, the stability of the camera is maintained, and meanwhile, the central beam of the phased-array antenna is used as far as possible to ensure the data transmission quality.

Description

technical field [0001] The invention relates to the field of aerospace technology, and relates to a data transmission attitude planning method for self-adaptive avoidance of the sun. Background technique [0002] The staring attitude towards the ground makes use of the maneuverability of the satellite to make the Z-axis of the satellite system always point to the ground station, and the central beam of the phased array antenna can be used for data transmission, which has the characteristics of long and stable data transmission time. Therefore, the optical remote sensing satellite Stations mostly adopt gaze posture when performing data transmission tasks. Under the satellite structure where both the camera and the phased array antenna coincide with the Z-axis of the satellite system, due to the characteristics of the gaze data transmission posture, the angle between the sun and the camera will be small during the execution of the data transmission task, causing the inner wall...

Claims

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Application Information

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IPC IPC(8): B64G1/24
CPCB64G1/244B64G1/245
Inventor 沈莹童鑫龚泽宇范林东戴路钟兴
Owner CHANGGUANG SATELLITE TECH CO LTD
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