Accurate beacon positioning method for satellite-to-ground optical communication.

Area of Science:

• Optical Engineering
• Satellite Communications
• Signal Processing

Background:

• Accurate beacon positioning is critical for stable laser communication links in satellite systems.
• Background noise and atmospheric turbulence significantly impact beacon acquisition in satellite-to-ground optical communication.

Purpose of the Study:

• To address challenges in satellite-to-ground optical communication, this study introduces a novel beacon locating algorithm.
• The algorithm aims to improve positioning accuracy under adverse conditions like noise and turbulence.

Main Methods:

• A new locating algorithm was developed, utilizing the correlation coefficient from curve-fitted image data as a weighting factor.
• The algorithm's performance was validated through extensive simulations and a 11.16 km long-distance laser communication experiment.

Main Results:

• The proposed algorithm accurately determines the beacon's centroid position, outperforming conventional methods.
• Experimental and simulation results confirm the algorithm's effectiveness in real-world conditions.
• The new algorithm demonstrated a 50% improvement in locating accuracy over the standard gray centroid algorithm when dealing with atmospheric turbulence distortions.

Conclusions:

• The developed algorithm offers a significant advancement for satellite-to-ground optical communication systems.
• It provides enhanced accuracy in beacon positioning, crucial for reliable laser link establishment.
• This method is expected to contribute positively to the future design and implementation of optical communication systems between satellites and ground stations.