Joint calibration method for internal and external parameters of multi-probe star camera

By using a multi-probe satellite camera's internal and external parameter joint calibration method, the problems of insufficient parameter coupling and low gross error removal accuracy were solved, achieving high-precision attitude calculation and relative installation relationship calibration, thus improving the positioning accuracy of satellite imagery.

CN121962294AActive Publication Date: 2026-05-01SHANDONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610385463.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-27
Publication Date
2026-05-01
Estimated Expiration
2046-03-27

AI Technical Summary

Technical Problem

Existing multi-probe satellite camera calibration methods suffer from insufficient consideration of parameter coupling, low accuracy in gross error elimination, and difficulty in calibrating relative installation relationships. These issues lead to a decrease in satellite attitude calculation accuracy and fail to meet the high-precision positioning requirements of high-resolution optical remote sensing satellites.

Method used

A multi-probe satellite camera internal and external parameter joint calibration method is adopted. This method involves constructing an initial ray pointing model, solving initial attitude parameters, removing gross errors, determining relative installation relationships, constructing a single-probe internal parameter calibration model and a joint calibration model, and using a step-by-step strategy and iterative optimization technology to achieve coordinated optimization and accurate calibration of internal and external parameters.

Benefits of technology

It significantly improves the overall calibration accuracy and parameter consistency of multi-probe satellite cameras, enhances the reliability and robustness of calibration results, reduces dependence on external conditions, and ensures high-precision geometric positioning of high-resolution optical remote sensing satellite imagery.

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Abstract

The invention relates to the technical field of remote sensing satellite ground data processing, in particular to a multi-probe star camera internal and external parameter joint calibration method, which comprises the following steps: constructing an initial light pointing model, and resolving initial attitude parameters; calculating a theoretical image space coordinate of a fixed star control point based on the initial attitude parameter, calculating an attitude parameter again by using the star point data after gross error elimination, and determining a relative installation relation initial value among the multi-probe star cameras; based on the angular distance constraint between star points in a single-frame image, constructing a single-probe internal parameter calibration model and a combined calibration model with internal parameters and relative installation relations as unknown numbers; the observation equation is weighted according to the weighting model, the internal and external parameters are updated based on the resolving result, iterative optimization is carried out until the convergence condition is met, the accurate internal and external parameters of the star camera are obtained, the influence of observation errors on parameter resolving is effectively restrained, and the calibration precision and the reliability of parameter estimation are further improved.
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