Precision analyzing method based on on-board data of double star sensors

Abstract

The invention provides a precision analyzing method based on on-board data of double star sensors. The precision analyzing method comprises the following steps of: firstly, calculating an optical axis flat turn angle and a rotary angle around an optical axis between the two star sensors at each moment; calculating an optical axis flat turn angle and a rotary angle around the optical axis between the two star sensors at each moment by a least square method; then, calculating white noises of the optical axis flat turn angle and white noises of the rotary angle around the optical axis; and finally, carrying out precision analysis on optical axis directions and non-optical axis directions of the two optical sensors. According to the precision analyzing method disclosed by the invention, the two star sensors are used for analyzing measurement precision of the star sensors by on-board measurement quaternion of the two star sensors, thereby overcoming the influences of various adverse factors when the precision of the star sensors is analyzed on the ground, guaranteeing a real application environment of the star sensors and removing influences on the analysis of the precision of the star sensors by factors of satellite control, posture determination and the like. The obtained measurement precision of the star sensors is highly credible.

Description

technical field [0001] The invention relates to an accuracy analysis method based on on-orbit data of Shuangxing Min. Background technique [0002] Star-sensing accuracy analysis is a very complex technology. Before the satellite enters orbit, there are roughly two ways to measure the star-sensing accuracy: [0003] 1. Through stargazing, that is, put the star sensor directly in an open place in the field, let the star sensor be directly sensitive to the stars in the sky, and perform image matching to calculate the corresponding inertial quaternion; the advantage of this test method is that the stars are natural Under certain conditions, it is more convincing, but the star drifts through the refraction of the atmosphere, which affects the accuracy of the star-sensitive attitude determination; [0004] 2. Through the ground starlight simulator, the starlight simulator stores the star point data of the entire sky, and displays the star map corresponding to the sky through a s...

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Problems solved by technology

[0003] 1. Through stargazing, that is, put the star sensor directly in an open place in the field, let the star sensor be directly sensitive to the stars in the sky, and perform image matching to calculate the corresponding inertial quaternion; the advantage of this test method is that the stars are natural Under certain conditions, it is more convincing, but the star drifts through the refraction of the atmosphere, which affects the accuracy of the star-sensitive attitude determination;

[0004] 2. Through the ground starlight simulator, the starlight simulator stores the star point data of the entire sky, and displays the star map corresponding to the sky through a small display with high resolution. The star sensitivity is sensitive to these artificial star points for image matching , to calculate the corresponding inertial quaternion; the advantage of this test method is that it can exclude the influence of atmospheric refraction; but because the stars are artificially simulated, the brightness and size of the star point will be affected by the hardware, which will bring a certain error;

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