Development of the Control System of High Speed Synchronous Rotating Mirror for Space Laser Ranging

With the development of space technology and aerospace industry, space distance measurement has become an important research content in space field. The traditional radar ranging is easily interfered by space high-energy particles and electromagnetic waves in space, and the measurement accuracy is low, which cannot meet the requirements of high-precision measurement. The air in the space is thin and the temperature changes violently, so it is impossible to carry out acoustic ranging with super measurement accuracy. Laser ranging technology is an automatic non-contact measurement method, which is not sensitive to electromagnetic interference, has strong anti-interference ability and high measurement accuracy. Compared with the general optical ranging technology, it has the advantages of convenient operation, simple system and allday working. Compared with radar ranging, laser ranging has strong anti-interference ability and high precision. In this paper, a high-speed synchronous rotating mirror system is developed to meet the requirements of the splitting of the transmitting and receiving optical paths in laser ranging. It is installed in the optical path of the large-scale laser ranging system, driving the mirror body to rotate stably and at high speed, realizing the splitting of the optical path and generating the pulse signal synchronous with the mirror body position to send to the laser, which is used for the timing of launching the synchronous laser machine. Finally, through the experimental test, when the speed reaches 3000 rpm, the peak speed error is less than 1rmp（PP）, the mirror shake amount is 15.56 ", and the equipment vibration is 8.9 μ m, which meets the needs of the scheme[10].