Simulation analysis method for drift angle of agile earth observation satellite

Abstract

The invention relates to a simulation analysis method for a drift angle of an agile earth observation satellite. The simulation analysis method comprises the following steps: firstly, generating a position vector, a velocity vector and osculating orbit element of the satellite at corresponding moments by using STK software; secondly, calculating a unit vector of a camera optical axis in an equatorial inertial coordinate system based on a target rolling angle and a target pitch angle of the satellite as well as the position vector and the velocity vector obtained in the first step; thirdly, calculating a vector between the earth center and a photographing point in the equatorial inertial coordinate system based on the position vector in the first step and the unit vector of the camera optical axis obtained in the second step; fourthly, calculating the drift angle based on the results of the first step, the second step and the third step. The method disclosed by the invention can be used for analyzing and verifying the calculation accuracy of the agile earth observation satellite in a ground test.

Description

technical field [0001] The invention belongs to the field of overall design of optical remote sensing satellites, and relates to a drift angle simulation analysis method suitable for agile earth observation satellites. Background technique [0002] When the space camera on the optical remote sensing satellite takes pictures of the ground target, due to the rotation of the earth itself, there will be relative motion between the target point and the camera, that is, camera image motion. Image motion will cause image blur and affect image quality, so image motion must be compensated, and the bias angle is an important factor that needs to be considered in the process of image motion compensation. [0003] The bias angle is the angle between the moving direction of the image motion compensation system and the direction of the image motion velocity. For the currently widely used TDICCD optical remote sensing satellites, the drift angle is the angle between the direction of the T...

AI Technical Summary

Problems solved by technology

The existing calculation methods for the deflection angle of agile satellites generally assume that the earth is an ideal sphere, and do not consider the influence of the earth's ellipticity on the calculation results (Jing Quan. Research on the calculation model of the deflection angle of agile satellites. Spacecraft Engineering, 2012, 21(4) :16-20; Huang Min, Ge Yujun, Yang Fang, etc. Influence of Agile Satellite Attitude on Image Movement Velocity and Drift Angle. Spacecraft Engineering, 2015,24(3):34-39)

When the satellite is imaged at a large angle attitude, there may be a large deviation between the drift angle calculated by these methods and the actual value

In addition, the accuracy of drift angle calculation is also affected by factors such as satellite orbital position accuracy and attitude control accuracy.

In the process of agile satellite ground whole star test, there is still a lack of an effective method to analyze and verify the calculation accuracy of the drift angle on the satellite

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