Star field geometric calibration method considering space-time decoupling and unsteady-state imaging

By adopting a star field geometric calibration method that takes into account space-time decoupling and non-steady state imaging in cluster satellites, the problem that traditional methods are difficult to meet the complex environment needs of cluster satellites is solved, and high-precision geometric positioning and attitude correction are achieved.

CN119672131AActive Publication Date: 2025-03-21BEIJING INST OF REMOTE SENSING INFORMATION +1
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Patent Information

Application Number
CN202411754178.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-03-21
Estimated Expiration
2044-12-02

AI Technical Summary

Technical Problem

Traditional geometric calibration methods are difficult to meet the needs of complex operating environments and diverse application scenarios of star cluster satellites, especially in high-frequency satellite calibration of high-resolution linear array cameras.

Method used

A stellar field geometric calibration method is proposed to take into account space-time decoupling and non-steady state imaging. Through the GAIA star table and optical remote sensing satellite attitude performance cataloging, a star point extraction operator with stellar motion compensation function is constructed, astronomical correction and adaptive empowerment are carried out, and the adaptive distortion model of azimuth elements in the camera is constructed, and geometric calibration parameters are solved based on the random sampling consistency method and partial least squares method.

Benefits of technology

High-precision extraction of star points under decoupling of space-time factors is achieved, coordinate adaptive empowerment of equilibrium magnitude, and smooth attitude correction under non-stable imaging conditions, significantly improving the geometric positioning accuracy of optical remote sensing satellites.

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Abstract

The invention provides a fixed star field geometric calibration method considering space-time decoupling and unsteady-state imaging, and the method comprises the steps: cataloguing a fixed star field adaptive to a satellite according to a GAIA (Gauge Assisted Independent Architecture) satellite catalogue and the attitude performance of an optical remote sensing satellite, and constructing a fixed star point extraction operator with a fixed star motion compensation function, the method comprises the following steps: performing star point identification on star map features in a satellite image field generated based on a fixed star field to obtain fixed star control points, performing astronomical correction on motion, parallax and aberration in fixed star coordinates, and obtaining observable limit stars and fixed star imaging window values according to a point spread function (PSF) of an image optical system. Carrying out adaptive weighting on the reliability of a fixed star observation coordinate, constructing a camera interior orientation element adaptive distortion model, and constructing a fixed star field geometric calibration model according to fixed star control points on attitude stationary correction under a non-stationary imaging condition of a satellite; and solving the fixed star field geometric calibration model based on a random sampling consistency method and a partial least square method to obtain geometric calibration parameters.
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