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Related Experiment Video

Updated: Aug 16, 2025

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

Multivariable Decoupling and Nonlinear Correction Method for Image-Based Closed-Loop Tracking of the Risley Prisms

Huayang Xia^1,2,3, Jinying Li^1,2, Yunxia Xia^1,2

¹Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu 610209, China.

|December 23, 2022

Summary

This summary is machine-generated.

This study introduces a novel method to improve image-based closed-loop tracking (IBCLT) using Risley prisms. The technique enhances dynamic response and target tracking accuracy by decoupling system errors and reducing nonlinear effects.

Keywords:

Risley prisms image-based closed-loop multivariable decoupling nonlinear correction variable gain

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Last Updated: Aug 16, 2025

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Area of Science:

Optics and Photonics
Control Systems Engineering

Background:

Image-based closed-loop tracking (IBCLT) is crucial for target tracking systems.
Risley prism systems offer compact and lightweight advantages but face challenges in IBCLT due to their complex, nonlinear, and coupled nature.
These challenges degrade dynamic response and tracking consistency.

Purpose of the Study:

To develop a method for multivariable decoupling and nonlinear effect reduction in Risley prism-based IBCLT.
To enhance the dynamic response and improve the consistency of target tracking capabilities.

Main Methods:

Implemented a rotation matrix error-decoupling (RMED) method to decouple boresight errors into azimuth and elevation directions.
Designed independent gain variables for azimuth and elevation based on target elevation angle functions to address nonlinearity.

Main Results:

Achieved IBCLT error deviation within 0.025 arcsec for static targets, a 70% improvement over fixed-gain methods.
Controlled steady-state error deviation for moving targets within 2.5 arcsec.
Demonstrated significant reduction in error deviation and improved tracking consistency.

Conclusions:

The proposed method effectively implements multivariable decoupling and reduces nonlinear effects in Risley prism IBCLT.
The approach significantly enhances tracking accuracy and stability for both static and moving targets.
Validated feasibility and effectiveness through experimental results, showing superior performance compared to traditional methods.