High-Precision Calibration Technology and Experimental Verification for Dual-Axis Laser Communication Systems

Area of Science:

• Optical Engineering
• Satellite Communications
• Precision Measurement

Background:

• Advancements in remote sensing satellite resolution drive the need for robust laser communication technology.
• Precise pointing accuracy of ground-based terminals is essential for stable satellite-ground laser transmission links.

Purpose of the Study:

• To propose and validate a high-precision calibration methodology using an error correction mathematical model for ground-based laser communication terminals.
• To enhance the pointing accuracy beyond traditional calibration methods.

Main Methods:

• Analysis of pointing errors in an alt-azimuth dual-axis laser communication terminal system.
• Development and implementation of an error correction mathematical model.
• Calibration experiments using stellar observations to fit error model parameters.

Main Results:

• The mean open-loop pointing error was controlled to approximately 5 arcseconds or less.
• Accuracy improvement exceeded 85% compared to traditional calibration methods.
• Demonstrated significant and highly accurate error correction effects.

Conclusions:

• The proposed error correction mathematical model effectively enhances the pointing accuracy of ground-based laser communication terminals.
• The methodology offers a significant improvement over existing techniques for stabilizing satellite-ground laser transmission.
• Validation through experiments confirms the method's practical applicability and high performance.