A method for stabilizing control of a fast steering mirror against stray light interference

By constructing a variational Bayesian robust filter based on an extended state-space model and an adaptive hierarchical Student's t model, the problem of stray light interference on fast reflectors in complex optical environments is solved, achieving high-precision line-of-sight stabilization control and anti-interference capability.

CN122450192APending Publication Date: 2026-07-24SHANDONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG UNIV OF SCI & TECH
Filing Date
2026-04-28
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In complex optical environments, fast reflectors are susceptible to stray light interference, which can lead to distortion of state estimates and instability of the line of sight. Existing technologies are unable to adapt to the intermittent and intensity variation characteristics of stray light interference and cannot effectively improve the stability and robustness of the line of sight.

Method used

An extended state-space model containing total disturbance is constructed. A variational Bayesian robust filter, combining a model-assisted extended state observer and an adaptive hierarchical Student's t model, is used to drive an exponential decay model through a sliding window Mahalanobis distance mean. The distribution degrees of freedom of measurement noise are calculated and adjusted in real time to generate line-of-sight stabilization control commands.

Benefits of technology

It significantly improves the line-of-sight stability and anti-interference capability of the fast reflector, achieves high-precision line-of-sight stabilization control, effectively isolates abnormal measurements, and improves the robustness and pointing accuracy of the system.

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Abstract

The application discloses a kind of anti stray light interference fast mirror stable control method, it is related to photoelectric tracking control technical field, for generating visual axis stable control instruction, including constructing extended state space model containing total disturbance, obtaining deflection angle measurement value, executing the time update of model auxiliary extended state observer, calculate prior state estimation value and prior covariance matrix, utilize deflection angle measurement value, prior state estimation value and prior covariance matrix calculate predicted innovation and its Markov distance, Markov distance mean value is used as input, utilize the exponential decay model with dead zone to calculate the adaptive degree of freedom of student's distribution, measurement noise is modeled as student's distribution controlled by adaptive degree of freedom, construct hierarchical measurement noise model, execute variation bayes iteration, output optimal extended state estimation value and introduce control loop, generate visual axis stable control instruction and drive actuator.The application can improve the high-precision visual axis stability and robustness of fast mirror.
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