Research On Cubesats Attitude Control Strategy And Control Algorithm

Cubesats are new creation.As Cubesats can quickly realize the standardization and modularization,they have a very good development prospect.However,with the increasing complexity of application of Cubesats,attitude,as the important basis of the normal operation,is also faced with more and more stringent requirements.Miniaturization,is the huge advantage of Cubesats,but also a huge limitation.The accuracy of attitude determination sensor is low,the solar cell chip can not get enough power,at the same time,it is difficult to achieve hardware backup.Under this background,this paper studies the attitude control strategy and control algorithm of Cubesats:Firstly,the thesis studies the attitude determination algorithm and control algorithm.According to different principle,the attitude determination methods can be divided into two kinds: attitude determinacy method and filtering algorithm.In this paper,the research and simulation of these two algorithms are carried out.The results show that it can obtain higher accuracy by using the method of filtering algorithm.Moreover,in view of the shortcomings of the traditional PID controller,an adaptive PID control law is designed and simulated.The simulation results show that the adaptive PID control law can quickly and stably converge to the target pose.Secondly,the thesis takes the “smart” Phonesat as the carrier,according to the mission requirements of Phonesat,the attitude control strategy is studied and designed,and the fault diagnosis method of the attitude control system is studied.For different working modes,the simulation and analysis of on orbit data of Phonesat are carried out respectively.At the end of this paper,the attitude sensor calibration algorithm is studied.The thesis models gyroscope and magnetometer and proposes an assembled algorithm for gyro calibration.According to the experimental data,the algorithm was verified.Two kinds of on orbit calibration algorithm is presented according to whether need attitude information.And on orbit calibration algorithm simulation and analysis of magnetometer is carried out.This paper takes the "smart" mobile satellite as the research object,studies the satellite attitude determination and control algorithm,designs the attitude control strategy,and the calibration algorithm of attitude sensor is simulated and verified by experiments.The complete scheme of attitude control system for the Cubesats is formed and has carried on orbit experiment verification.The paper has important reference value for the design of Cubesats.