Pointing-error correction of optical communication terminals on motion platforms using a parameter model and kernel...

Area of Science:

• Optical Engineering
• Space Communication Systems
• Precision Pointing Technology

Background:

• Global communication networks rely on optical communication terminals (OCTs) for high-speed data transfer.
• Pointing accuracy of OCTs on motion platforms is crucial but degraded by linear and nonlinear errors.
• Existing methods struggle to fully address complex error sources in dynamic OCT systems.

Purpose of the Study:

• To develop and validate a novel method for correcting pointing errors in OCTs on motion platforms.
• To enhance the pointing accuracy of OCTs for reliable global communication.
• To address both linear and nonlinear error components affecting OCT performance.

Main Methods:

• A physically meaningful parameter model was established to correct linear pointing errors.
• Kernel Weight Function Estimation (KWFE) was employed to correct residual nonlinear pointing errors.
• Star tracking experiments were conducted to quantify the effectiveness of the proposed correction methods.

Main Results:

• The parameter model reduced initial calibration pointing errors from 1311.5 µrad to 87.0 µrad.
• Subsequent KWFE further reduced these errors to 70.5 µrad.
• The combined method reduced actual open-loop pointing errors from 93.7 µrad to 73.3 µrad.

Conclusions:

• Sequential application of a parameter model and KWFE significantly improves OCT pointing accuracy on motion platforms.
• The proposed method offers a robust solution for enhancing OCT performance in dynamic environments.
• This advancement is critical for the successful deployment of a global optical communication network.