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利用三轴气浮台对遥感卫星进行载荷平台一体化全系统闭环物理仿真,可模拟卫星在轨运行时的动力学特性,验证整星在轨状态下的姿控特性和相机成像特性等。高精度辨识气浮台转动惯量和综合干扰力矩为三轴气浮台质量特性调整及量化评估整星级试验性能提供重要参数。文章提出一种新的大型三轴气浮台转动惯量和干扰力矩联合辨识技术,通过台上飞轮对三轴施加激励作用,利用激光陀螺等姿态测量数据实现对台体惯量矩阵和干扰力矩的高精度联合辨识。与传统辨识方法不同,该技术仅利用本体角速度信息,不需要角加速度信息,避免了角速度微分引起的噪声放大,将转动惯量辨识相对误差控制在3.5%以内,气浮系统综合干扰力矩优于0.003 N·m,满足了高精度参数辨识需求。
The three-axis airborne platform is used to simulate the dynamic characteristics of the satellites in-orbit, and to verify the attitude-controlling characteristics of the whole-orbit on-orbit and the imaging characteristics of the camera. Accurately identifying the moment of inertia and the total disturbance torque of the flotation platform provide important parameters for the adjustment of the quality characteristics of the three-axis flotation platform and the quantitative evaluation of the whole-star test performance. In this paper, a new joint identification technology of moment of inertia and disturbance torque is proposed for a large three-axis air-floating platform. The three-axis flywheel is excited by on-board flywheel, and the attitude inertia and interfering torque are high Precision joint identification. Different from the traditional method, this technique uses only the angular velocity information of the body and does not need the angular acceleration information to avoid the noise amplification caused by the differential angular velocity. The relative error of rotor inertia identification is controlled within 3.5%, and the comprehensive interference torque of the air floating system is better than 0.003 N · m, to meet the needs of high-precision parameter identification.