Parallel-filter observer control with CCD measurements for space optical communication equipment on a moving platform

Qingqing Miao , Qihui Bian , Bo Qi

Optics Express +

|

August 13, 2025

View abstract on PubMed

Summary

This study introduces a parallel-filter observer to stabilize line-of-sight (LOS) for space optical communication, overcoming bandwidth limits for trajectory tracking with charge-coupled device (CCD) measurements.

Area Of Science

Aerospace Engineering
Optical Communication Systems
Control Systems Theory

Background

Space optical communication missions require precise line-of-sight (LOS) stabilization for effective trajectory tracking.
Existing methods face bandwidth limitations with charge-coupled device (CCD) measurements on moving platforms.
Degradation in stability can occur with single high-bandwidth filters in tracking systems.

Purpose Of The Study

To develop a novel parallel-filter observer methodology for stabilizing LOS in space optical communication.
To overcome the bandwidth limitations inherent in current trajectory tracking systems.
To enhance the stability and tracking performance of gimbals in dynamic space environments.

Main Methods

Implementation of a parallel-filter observer to stabilize LOS.
Introduction of an equivalent high-order parallel-filter compensator to reduce controller output.
Utilization of tracking errors directly for LOS stabilization, avoiding complex target dynamics modeling.

Main Results

The parallel-filter observer effectively mitigates stability degradation compared to single high-bandwidth filters.
A stabilized high-bandwidth observer is achieved, enhancing tracking accuracy.
Simulation and experimental results confirm improved LOS stabilization under carrier disturbance and target motion.

Conclusions

The proposed parallel-filter observer methodology offers a simple and applicable solution for LOS stabilization in space optical communication.
It provides excellent tracking performance for engineering applications with limited measurement bandwidth.
The approach enhances gimbal stability in inertial space and is robust to disturbances.