Development and validation of low-orbit satellite-ground laser communication tracking mount

For the development of the tracking frame in the field of low-orbit satellite-terrestrial laser communication, the motion performance requirements of the tracking frame for low-orbit communication was firstly analyzed, and then the overall design of lightweight and miniaturization was carried out. For the commonly used double-row ball rotary table bearing, the rigidity calculation model and method of this kind of bearing were proposed based on Hertz theory, and the maximum deformation of the ball was 2.92 μm. The friction torque-temperature relationship of the bearing was studied, and the friction torque of the bearing was reduced to 8.9 Nm at −30 ℃ by the optimum selection of clearance and grease. The simulation results of the tracking frame show that the maximum deformation of the tracking frame under the load of 180 kg does not exceed 0.02 mm, and the fundamental frequency is more than 20 Hz, which has good static and dynamic characteristics. The development of the prototype was finally completed. The accuracy test results show that the PV values of the azimuth and pitch axis system wobble error are ±2.8″ and ±4.1″, respectively. The satellite-to-ground digital transmission experiments clearly illustrate the feasibility of the proposed tracking frame, which has a certain reference value for the development of similar tracking frames.