A complex image rotation fast solving method and system for an optoelectronic tracking and sighting system

CN122260641APending Publication Date: 2026-06-23CHINA PRECISION ENG INST FOR AIRCRAFT IND AVIC

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: CHINA PRECISION ENG INST FOR AIRCRAFT IND AVIC
Filing Date: 2026-05-20
Publication Date: 2026-06-23

AI Technical Summary

Technical Problem

Existing photoelectric tracking systems employ complex and parameter-intensive image rotation calculation methods under complex optical path conditions, making it difficult to meet the high-precision requirements of engineering applications. This is especially true when fast-reflecting mirrors are involved, where traditional methods are not applicable, further increasing the difficulty of image rotation calculation and correction.

Method used

By simplifying the optical path structure in an equivalent geometric sense, the complex optical path is mapped into a single optical axis model. A mirror structure is introduced to make the azimuth axis and elevation axis equivalently coaxial in the imaging coordinate system. The small-angle deflection of the fast-reflecting mirror is used to obtain the imaging miss response relationship, establish the mapping curve, and use the decoupling state as a criterion to calibrate and compensate the initial phase angle, finally obtaining a high-precision image rotation angle.

Benefits of technology

It enables the rapid acquisition of high-precision image rotation angles without the need for precise optical path parameter modeling, simplifies the calculation process, and improves engineering implementation efficiency and reliability. It is suitable for photoelectric tracking and aiming systems that include fast-reflecting mirrors and dual-axis servo turntables.

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Abstract

This invention relates to a method and system for rapid image rotation calculation in an optoelectronic tracking system. Addressing the problems of existing image rotation calculation methods relying on complex modeling, numerous error terms, and difficult engineering design, this method introduces a 45° mirror structure in an equivalent geometric sense, mapping the complex optical path to a single optical axis model. This ensures that the azimuth and elevation axes are equivalently coaxial in the imaging coordinate system, thereby constructing a simplified initial image rotation calculation model. The image rotation angle can be expressed as the initial phase angle, which is the algebraic sum of the azimuth and elevation angles superimposed on each other. Furthermore, by applying a small-angle deflection to the fast-reflecting mirror, the response relationship of the imaging miss distance in the image coordinate system is obtained. Mapping curves between each axis of the fast-reflecting mirror and each component of the miss distance are established. The initial phase angle is calibrated and compensated using the decoupling state as a criterion, ultimately obtaining a high-precision image rotation angle. This method does not require precise optical path parameter modeling, and the calculation process is simple and converges quickly.

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