Research On Satellite Micro-angular Vibration Measurement Technology Based On MHD Micro-angular Vibration Sensor

The micro-angular vibration of the satellite structure limits the pointing accuracy and attitude control stability of high-precision satellite.Therefore,it is necessary to do on-orbit measurement to obtain micro-angular vibration characteristics and do active compensation or other treatments.In order to accurately measure the satellite structure micro-angular vibration,after comparing several measurement methods used at home and abroad,this paper proposes a method for measuring satellite structure microangular vibration based on magnetohydrodynamic(MHD)micro-angular vibration sensor,and designs the micro-angular vibration measurement system based on this measurement method.According to the characteristics of the micro-angular vibration of the payload caused by the momentum wheel,do verification experiments by using existing resources of the laboratory.The specific work is as follows:First of all,this paper introduces the characteristics and effects of the micro-angle vibration of satellite structures,analyzes the development and methods of satellite micro-angular vibration measurement at home and abroad,and designs a method of measuring the micro-angular vibration of satellite structure using MHD micro-angular vibration sensor as the sensitive component.Then,the overall design scheme of the satellite structure micro-angular vibration measurement system based on MHD micro-angular vibration sensor and specific design on hardware and software are expounded.For the various unstable factors that the measurement system may encounter in the space environment,the installation and fixation of the MHD micro-angular vibration sensor,the signal transmission process,the targeted selection of the system components,the fault tolerance method and the signal processing algorithm are all innovatively designed.The signal processing algorithm is simulated after that.The above work ensures the accuracy and reliability of the system for micro-angular vibration measurement.Finally,according to the design above,the experimental system components are selected,the experimental platform is built,and the existing resources of the laboratory are used for ground experimental verification.The experimental content includes single frequency simulation experiment and mixed frequency simulation experiment.The result shows that the experimental system can obtain micro-angular vibration frequency information with relative error less than 0.2% and micro-angular vibration amplitude information with relative error less than 10%,so it is able to acquire micro-angular vibration characteristics of payload.The research of this paper can provide data reference for satellite payload microangular vibration compensation and satellite attitude control stability improvement.