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为了模拟轨道运动对激光通信终端PAT系统性能的影响,研制了高精度一维转台。分析了GEO-LEO、LEO-LEO卫星相对运动角速度,据此提出转台角速度范围的需求;以控制器数字控制技术为基础,采用复合控制和高阶输入串联校正的方式实现超低速的平稳控制;分析转台角位置定位精度检测过程中,调整、对准误差对检测精度的影响,实现高精度检测。结果表明,转台最大角速度为2(°)/s,调整、对准误差引起的角位置定位精度测量误差可以忽略,实测转台定位精度优于2.5″。转台满足高精度、低转速的空间激光通信终端轨道模拟要求。
In order to simulate the influence of orbital motion on the performance of laser communication terminal PAT system, a high-precision one-dimensional turntable was developed. The relative angular velocity of the GEO-LEO and LEO-LEO satellites is analyzed, and the demand of the angular velocity range of the turntable is proposed. Based on the digital control technology of the controller, the composite control and the high-order input series correction are used to realize the ultra-low speed smooth control. In the process of detecting the positioning accuracy of turntable angle position, the influence of adjustment and alignment error on the detection accuracy is analyzed to achieve high-precision detection. The results show that the maximum angular velocity of the turntable is 2 (°) / s, and the error of the positioning accuracy of the angular position caused by the adjustment and alignment errors can be ignored. The measured turntable positioning accuracy is better than 2.5 ". The turntable can meet the requirements of high precision and low speed space laser communication Terminal track simulation requirements.