Ms. yan zheng Xue Profile

yan zheng Xue

at Institute of Optics and Electronics CAS

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Proceedings Article | 21 August 2013 Paper

Vibration-induced jitter control in satellite optical communication

Zheng-yan Xue, Bo Qi, Ge Ren

Proceedings Volume 8906, 89061X (2013) https://doi.org/10.1117/12.2034575

KEYWORDS: Feedback control, Satellites, Satellite communications, Mirrors, Digital filtering, Optical communications, Adaptive control, Data modeling, Control systems, Sensors

Read Abstract +

Laser satellite communication has become especially attractive in recent years. However, because the laser beam is very narrow and there is a long distance between satellites, the laser communication channel is very sensitive to vibrations of the optical platform. These vibrations cause optical jitter, leading to the reduction of received signals and bit-error rate degradation. Consequently, optical jitter control with PAT (pointing acquisition and tracking) subsystems is a critical problem in laser satellite communication. To compensate for the platform vibration effectively in realtime, in this paper, an adaptive feedback control technique based on Youla-parameterization is presented, which can adapt to the current disturbance acting on the laser beam by adjusting its parameters in realtime to maintain optimal performance. The main idea is to use the well-known Youla parameterization formula to construct a feedback control scheme with the guaranteed closed loop stability, and the feedback controller is a function of plant coprime factors and a free parameter Q. For adaptive disturbance estimation, the free parameter Q is set to an adaptive finite impulse response (FIR) filter, the coefficients of which are updated by a recursive least-squares (RLS) algorithm in realtime. It is shown in experiment that the adaptive feedback control technique based on Youla-parameterization can reject the optical jitter caused by satellite platform vibration effectively and improve the performance of the system.

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