Analyse Of Axis-Errors And Compensating In Terminal Of Intersatellite Optical Communication

Compared with microwave communication, intersatellite optical communication has advantages such as larger communicative volume, smaller terminals and better secretive ability, and should be an important direction in the development of intersatellite communication. In recent years, the research of intersatellite optical communication technology has been taken into account and developed in many countries such as the United States, the European countries, Japan and Russia. The intersatellite optical communication technology has also been taken into account in our country, and some achievements have been gotten. During the process of the establishment and maintenance of the intersatellite laser link, the angle deflection detection is used to adjust the error of acquisition and tracking. The precision of the angle deflection detection system affects the ability of pointing, acquisition and tracking (PAT) a lot, and plays an important role in the establishment of the intersatellite laser link. Because of the narrow laser beam and the long distance between the satellites, the effect of the setting precision of the intersatellite optical communication terminal to the PAT ability is increased. So it is very important to analyze the effect of the terminal optical elements to the PAT precision.Aim for the effect of the setting error of axes of the intersatellite optical communication terminal and the project of angle detection and compensation, follow contents are studied.The international development of intersatellite optical communication technology is overviewed. The beam vector deflection caused by the setting error of each optical element in the communication terminal system is analyzed. And this paper classifies and defines these setting errors of rotational platform.Detailed theory analysis is given aim for the process of the beam transferring in the terminal. In the analysis, the matrix model that describes each optical element's setting condition in the terminal is given by using the matrix transferring theory of optical instruments. Then the vector form of the beam direction in the terminal is gotten. And this paper analyses the running character of rotational platform. According to the vector model of beam transferring, this paper analyses the infection of axis errors during terminal pointing and tracking, and numerical simulate these infections.According to the infection of axis error to vector model of beam transferring, more precise CCD angle detection algorithm and the fine pointing detector controlling algorithm that is used to compensate the setting error are designed. And legitimacy of these methods is testified by numerical simulation.The studies in this paper have provided preliminary theory model and detection project for the analysis of the effect of the setting error of the inter-satellite optical communication terminal. Based on these, further research and experiments should proceed.