The Research Of Frequency Domain Forecasting Compensative Method For The Vibration In Satellite Optical Communication

As the development of the modern communication system, Satellite optical communication technology is becoming increasingly important to technologically powerful countries in the world. In the satellite optical communication system, the vibration of satellite platform will induce the error of pointing and tracking, which may cause the intensity of signal even break the communication link off So the further research on the compensation of the satellite platform vibration is in necessary in order to reduce the effect of the vibration in satellite optical communication.This paper introduced the vibration modes and sources of satellite platform firstly. Then the research status of vibration compensation is summarized and analyzed. On this basis, several problems are studied as follows1. Forecasting compensative method is put forward based on Fourier transform analysis, and a theoretical simulation is provided in detail.This paper conducted an analysis of the effect caused by the vibration of satellites. After analysing the presented compensative methods, forecasting compensative method is put forward,and the application and feasibility of the forecasting Fourier transform method is also simulated. The conclusion of theoretical analysis and simulation shows that the forecasting method has a positive effect on compensation of the satellite platform vibration and this compensative method is a feasible method for the compensation of satellite platform vibration.2. The compensation system for satellite vibration is established, and the compensative method is investigated experimentally.Adopting time domain and frequency domain compensative methods, this paper compensated kinds of vibration types in order to verify their feasibility and effectiveness. At the same time, make a comparison among the compensation effect brought by different compensation methods. Also the effect of different vibrational parameter on the compensative property is showed.The experimental results show that the time domain compensative method is effective when the frequency of vibration is lower than 50Hz, however, the Fourier transform domain method is still effective even when the frequency is higher than 80Hz. It can be concluded that the Fourier transform domain method is superior to the time domain compensative method under the experimental situation.In this paper frequency domain forecasting compensative method is put forward and the effectiveness and feasibility of the method are proved by the experiment results. It can be concluded that the compensative method is a effective technique to improve the stability of satellite communication system.