Optimization of spatial acquisition systems for low-light-level robustness in space optical communications

Area of Science:

• Space optical communications
• Optical engineering
• Satellite systems

Background:

• Space optical communication relies on Acquisition, Tracking, and Pointing (ATP) systems for beacon beam acquisition and tracking.
• Insufficient optical power can cause unstable acquisition or outright failure in ATP systems, limiting communication reliability.

Purpose of the Study:

• To investigate the mechanisms causing instability in ATP systems under low optical power conditions.
• To propose and validate a novel approach for constraining acquisition velocity to enhance system robustness.

Main Methods:

• Analyzing instability mechanisms in ATP systems.
• Developing a velocity prediction method using light spot centroids and angle measurement data.
• Implementing and testing the proposed approach through theoretical analysis and experiments.

Main Results:

• The proposed approach effectively constrains acquisition velocity.
• The acceptable minimum optical power for acquisition was reduced by 5.5 dB.
• Enhanced robustness of the acquisition system under low-light-level conditions was demonstrated.

Conclusions:

• The optimized ATP system significantly improves robustness in low-light conditions, crucial for space optical communications.
• This approach enhances the adaptability of satellite-ground optical links.
• The method holds practical value for deep-space optical communication systems.