Research On Error Feedback Vibration Compensation Algorithm Of Intersatellite Optical Communication

The merits of Intersatellite Optical Communication is large communication volume,small terminal, good security and so on, contrast to the microwave communication, so it is attended. the narrowly beam of the laser,the long communication distance also bring huge difficulty to the PAT system, which answer for the constitution of the link of laser communication .In order to ensure communicating, the accuracy of tracing and pointing need to reach the magnitude of micro-radian.,the vibration amplitude of satellite flatform can arrive 100urad, that reduct the quality of optical communication,so it is meaning to control and compensate the vibration of intersatellite flatform.Now the vibration controlling mainly include passive isolation and active compensation. The passive isolation is that people set up the vibration isolation system, which is effective to the vibration of high frequency, but the effect isn't good to low frequency vibration.people usually adopt active compensation method to control low frequency vibration, the active compensation is that cancel the vibration influence by the FSM in the fine-tracking subsystem, so the key of active compensation is that obtain the vibration compensation quantity of the FSM in fine-tracking subsystem.This paper introduce a new low frequency vibration compensation algorithm,adopt adaptive filter, which based the LMS algorithm, to gain the vibration compensation quantity of FSM. The accelerometer provide The reference signal of adaptive filter, the weight of w is adjusted by error signal from CCD, that make the vibration compensation of FSM optimum, so that the vibration can be effectively compensated .This method hold strong self adapting adjustment ability, it can automatically adjust self parameter to adopt exterior change.This paper systematically analyse the principle of error feedback vibration compensation algorithm of the satellite optical communication ,and crate the system function simulation model ,and emulate the algorithm function by the MATLAB. The contents of emulation mainly include four aspects. the effect of vibration amplitude of the satellite on algorithm function; the effect of terminal vibration frequency on algorithm function; the effect of detector's sampling frequency on algorithm function; the effect of system time delay on algorithm function and so on. In order to reduce the effect of system time delay, this paper employ the vibration forecasting to improve algorithm function. Through the analyzing of emulation result, we can see that the error feedback vibration compensation of satellite optical communication own superiority function ,it is a good vibration compensation algorithm.The research of this paper extend the field of vision of vibration compensation algorithm of the satellite optical communication, it provide credibility principle and emulation basis for employing error feedback compensation algorithm to specific hardware system.