Heavenly body sensor measuring reference transform method and apparatus thereof

Abstract

The invention discloses a measurement reference conversion method for a celestial body sensor. A light source simulator, a three-axis turntable and a photoelectric autocollimator are set up on an optical platform, and the astronomical body sensor is arranged on the inner frame of the three-axis turntable. A. Adjust the photoelectric autocollimator so that its optical axis is parallel to the rotation axis of the inner frame; B. Rotate the middle frame and outer frame of the turntable to different angles to obtain calibration point data, and calibrate the internal and external parameters of the celestial body sensor; determine the coordinate system of the turntable to the celestial body sensor C: measure the vector relationship between the normal direction of the two reflective surfaces of the mirror cube and the optical axis of the photoelectric autocollimator, and calculate the transformation matrix from the turntable coordinate system to the mirror cube coordinate system; D: calculate the astrosensor coordinate system to the mirror surface The transformation matrix of the cube coordinates; the product of the light vector measured by the astrosensor and the transformation matrix in D is the direction of the transformed vector. The invention also discloses a sub-device for realizing the above method. The invention has simple and high precision.

Description

technical field [0001] The invention relates to astronomical sensor measurement technology, in particular to a method and device for converting astronomical sensor measurement reference. Background technique [0002] The celestial sensor is sensitive to stellar radiation and obtains the orientation of the spacecraft relative to the star. Typical celestial sensors include sun sensors, star sensors and earth sensors, which are mainly used to measure the line of sight of stars and a certain body axis of the spacecraft. or the angle between the planes. The direction of the light vector directly measured by the astrosensor is defined in the measurement coordinate system of the astrosensor, or in other words, the measurement coordinate system of the astrosensor is used as the measurement reference. In order to convert the directly measured light vector direction to the motion carrier coordinate system in actual use, it is necessary to establish an observable measurement datum on ...

AI Technical Summary

Problems solved by technology

This method needs to install the mirror cube to a reference position that has a strict and accurate position relationship with the coordinate system of the celestial sensor, which not only depends on the accuracy of machining, but also depends on the accuracy of installation, which makes the processing difficult and the installation process complicated. , and since the measurement coordinate system of the astrosensor is invisible, it is difficult to direct high-precision positioning mechanically, resulting in low precision of datum conversion

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