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A method for indoor calibration of azimuth elements in a star sensor

An internal orientation element, star sensor technology, applied in the field of aerospace measurement, can solve the problems affecting the accuracy of the star sensor parameters, and achieve the effect of reducing the installation and alignment process of the star sensor, reducing the requirements, and simplifying the calibration process.

Active Publication Date: 2022-07-19
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] (c) Even if installation errors and measurement system errors are used as model parameters in the calibration system modeling process, such calibration methods make the solution errors of external parameters in turn affect the accuracy of star sensor internal parameters

Method used

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  • A method for indoor calibration of azimuth elements in a star sensor
  • A method for indoor calibration of azimuth elements in a star sensor
  • A method for indoor calibration of azimuth elements in a star sensor

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Embodiment

[0121] In this section, the effectiveness of the method is verified by simulation and experimental data. For an example of a specific implementation process, see the section "Detailed Implementation" above. In order to verify the generalization ability of the method, the fitting usage data (for calculating the internal parameters) and the validation usage data (for calculating the inter-satellite angular spacing error) do not overlap.

[0122] In the first test case, the basic parameters of the simulated star sensor are:

[0123] Field of view: Φ20°

[0124] Pixel array: 1536×1536

[0125] Main point location: (758, 775)

[0126] Pixel size: 5.5um×5.5um

[0127] Focal length: 24.0955mm

[0128] Assuming that the centroid noise of the star point is Gaussian distribution noise with zero mean and standard deviation of 0.05 pixels, since the number of acquisitions at each data acquisition location is n=10, the noise level decreases after averaging, that is, 0.016 pixels. At ...

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Abstract

The invention discloses an indoor calibration method for azimuth elements in a star sensor. The method is based on a calibration system consisting of an air cushion platform, a one-dimensional single-axis turntable, a single star light simulator, a star sensor, a rotatable star sensor tooling bracket and a data processing computer. The steps include: modeling the calibration system, Data collection and data processing. The invention adopts an algorithm model that does not depend on external parameters, and avoids the introduction of external parameter solution errors into the estimation process of internal parameters, thereby affecting the accuracy of parameter calibration. The invention adopts a one-dimensional single-axis turntable, which reduces the requirement for calibration equipment, and at the same time avoids the installation error of the star sensor in the inner frame during the use of the two-dimensional axial turntable, and the inconsistency between the two shafts of the two-dimensional axial turntable. Problems such as system errors introduced vertically. This method reduces the complicated star sensor installation and alignment process in the calibration process, and makes the whole calibration process relatively simple.

Description

technical field [0001] The invention belongs to the technical field of aerospace measurement, in particular to an indoor calibration method for azimuth elements in a star sensor. Background technique [0002] The star sensor is a high-precision attitude-sensitive measuring instrument. It takes the star as the reference frame and the starry sky as the working object. It uses the starlight camera it carries to take a star map. It is sensitive to multiple stars and gives multiple reference vectors. The attitude of the carrier is calculated by steps such as image preprocessing, star image recognition, and attitude calculation. The calibration of the star sensor is an indispensable and important link to realize the accurate measurement of its attitude. Before the star sensor is used, the internal parameters such as the principal point, focal length and distortion of the star sensor must be accurately measured, which is called star sensor calibration. The star sensor calibration...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
Inventor 傅景能卢亮魏宏刚代冬军林玲张辉李强
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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