Research And Design Of Drive Control For Space Pointing Mechanisms

In recent years,with the development of aerospace technology and the deepening of space exploration research,the application of space pointing mechanisms has become an important development direction in the field of aerospace.Among them,the electric propulsion vector adjustment device is one of the spatial pointing mechanisms.When a satellite performs a low-Earth orbit or deep space exploration mission,it is necessary to cooperate with the thruster and its pointing mechanism to change the mode of satellite orbital parameters or satellite attitude maintenance.In addition,high-performance pointing mechanisms can improve the efficiency of satellite missions and reduce on-star energy consumption.Therefore,the study of the propeller pointing mechanism is indispensable.In early studies,the satellite thruster pointing mechanism has a small angle rotation or a single degree of freedom adjustment mode,which requires the satellite’s orbit change or attitude retention function by installing multiple devices,which leads to an increase in the total weight of the satellite and does not meet the space mechanism design standards of modern spacecraft.At the same time,the drive control mode with open-loop segmentation is not suitable for long-term work.The stability and reliability of the pointing mechanism are affected,which is easy to reduce the pointing accuracy of the mechanism.In order to reduce the total weight of the satellite and increase the pointing adjustment range,the driving control of the two-degree-offreedom pointing mechanism is studied and designed,and the pointing accuracy of the system is optimized by using closed-loop control.The research content of this paper mainly includes the following aspects:Design of high-precision position-driven control system for spatial pointing mechanism.According to the design index requirements of the high-precision space pointing mechanism,the overall design scheme and the working mode of the thruster vector adjustment device are proposed,and the simulation model of the high-precision control system of the uniaxial pointing mechanism is built using matlab/simulink to verify the rationality and accuracy of the parameter performance of the driving control system.Hardware circuit design of spatial pointing mechanism drive system.Determine the selection of relevant components,and take the FPGA chip A3PE15000 as the main controller,and design the motor drive circuit,current monitoring circuit and position sensor circuit according to the requirements of the system.Spatial pointing mechanism-driven system software design.The closed-loop driver control software system for the mechanism is implemented by FPGA.According to the system design indicators,the overall architecture of the FPGA software system is formulated,making full use of the advantages of FPGA parallel computing,optimize the system and reduce the consumption of FPGA resources.Experimental results and analysis.Test and analyze the designed space pointing mechanism-driven control system.Verify the reliability and feasibility of the designed driver control system according to the actual indicators of the system.