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Indoor calibration method for star sensor interior orientation elements

A technology of inner orientation element and star sensor, which is applied in the field of aerospace measurement and can solve problems such as affecting the accuracy of star sensor parameters.

Active Publication Date: 2019-05-24
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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  • Indoor calibration method for star sensor interior orientation elements
  • Indoor calibration method for star sensor interior orientation elements
  • Indoor calibration method for star sensor interior orientation elements

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Embodiment

[0121] In this section, the effectiveness of the method is verified through simulation and measured data. For an example of a specific implementation process, refer to the section "Specific Implementation Mode" above. In order to verify the generalization ability of the method, the data used for fitting (used to calculate internal parameters) and the data used for verification (used to calculate the angular spacing error between stars) 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] Principal point position: (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 a mean value of zero and a standard deviation of 0.05 pixels, since the number of acquisitions at each data collection location is n=10, the noise level decreases after aver...

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Abstract

The invention discloses an indoor calibration method for star sensor interior orientation elements. The method is based on a calibration system which comprises an air cushion platform, a one-dimensional single-shaft rotary table, a single star light simulator, a star sensor, a rotatable star sensor tool support and a data processing computer. The method includes: calibration system modeling, datacollecting and data processing. The method has the advantages that an algorithm model independent of external parameters is adopted, and parameter calibration precision is prevented from being affected by the fact that external parameter solving errors are introduced into the estimation process of internal parameters; the one-dimensional single-shaft rotary table is used, requirements on calibration equipment is lowered, and the problems of star sensor mounting errors in an inner frame, system errors caused by the non-vertical introduction of two shaft systems of a two-dimensional axial rotarytable and the like during the use of the two-dimensional axial rotary table are avoided; the complex star sensor mounting and alignment process during calibration is omitted, and the whole calibration process is relatively simple.

Description

technical field [0001] The invention belongs to the technical field of aerospace measurement, and in particular relates 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 uses the star as the reference system 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 provides 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, 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. Star sensor cali...

Claims

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Application Information

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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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