针对星载大型空间可展开天线与卫星平台之间的动力学耦合问题提出一种三自由度驱动与测量机构用于连接天线臂与卫星平台.该机构以驱动电机来控制天线臂转动,通过角度传感器对天线臂转角的测量来实现反馈控制,同时在卫星姿态控制系统中引入前馈控制进行反作用力矩补偿,实现卫星平台与天线之间的解耦控制、抑制天线的振动、提高卫星姿态控制系统的性能.通过姿态稳定状态下卫星-天线系统解耦动力学模型的建立、控制系统的设计、姿态控制的仿真分析,表明解耦机构能大幅增加天线振动的阻尼,有效提高卫星稳定性和天线指向精度.%A three degree of freedom driving and measurement mechanism for interfacing antenna arm and satellite is proposed to cope with the problem of dynamics coupling between large deployable space antenna and satellite platform. This mechanism employs driving motors to control the antenna arm and angle sensors to measure the rotating angle of antenna arm, thus constructing a rotating angle feedback control system, also the motor driving torque are fed forward into attitude control system for compensating reacting torque, thus implementing decoupling between satellite attitude control and antenna control, suppressing antenna vibration and improving satellite attitude control performance. By dynamics modeling of attitude stablization, control system design and simulation, increased vibration damping, improved pointing accuracy of antenna and higher satellite stability are demonstrated.
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