Predictive filtering-based fast reacquisition approach for space-borne acquisition, tracking, and pointing systems
Optics Express
|November 18, 2014
Summary
This study introduces a new method for rapid target recapture in space-borne laser communication after signal loss. The approach uses past data for trajectory prediction, significantly reducing acquisition times compared to traditional methods.
Area of Science:
- Space-borne optical systems
- Laser communication technology
- Control systems engineering
Background:
- Space-borne Acquisition, Tracking, and Pointing (ATP) systems are crucial for free-space laser communication.
- Target loss in ATP systems necessitates rapid reacquisition to maintain communication links.
- Existing orbit prediction methods may not be optimal for dynamic target scenarios.
Purpose of the Study:
- To develop a novel approach for minimizing target reacquisition time after loss of signal in space-borne ATP systems.
- To enhance the predictive capabilities of ATP systems using past angular information.
- To improve the efficiency and speed of free-space laser communication link recovery.
Main Methods:
- Proposed a novel approach utilizing past angular information for target trajectory prediction.
- Designed an optimized finite memory filter as the core prediction algorithm.
- Implemented offline training to determine optimal filter parameters for different trajectory curve characteristics.
- Adjusted filter parameters in real-time based on observed curve features during predictive filtering.
Main Results:
- Achieved prediction accuracy exceeding 0.1 degrees within 5 seconds in simulations.
- Experimental validation using a dynamic target and a real ATP system confirmed the approach's effectiveness.
- Demonstrated significantly shorter acquisition times compared to classical orbit prediction methods.
Conclusions:
- The proposed optimized finite memory filter approach offers a significant improvement in target reacquisition speed for space-borne ATP systems.
- This method effectively addresses the challenge of rapid target recapture after signal loss in free-space laser communication.
- The findings have implications for enhancing the robustness and reliability of laser communication links in space.
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