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根据合成孔径雷达(SAR)卫星对地聚束成像模式下的任务特点,对其成像覆盖区域进行分析,推导出对地聚束成像的期望姿态跟踪规律。为了尽快跟踪地面目标,需要多轴同时进行大角度姿态机动控制;为了实现SAR天线对地聚束成像,跟踪上目标后还需要进行连续跟踪姿态机动。本文采用测速反馈的反作用飞轮控制技术,设计了基于时间最优bang-bang控制的PD控制器,实现了地面目标的快速跟踪指向;针对系统存在的扰动,在PD控制器中设计了系统的前馈输入补偿器,从而保证了姿态跟踪指向的精度。姿态控制系统数学仿真结果表明该控制技术有效。
According to the mission characteristics of Synthetic Aperture Radar (SAR) satellite to ground bunching imaging mode, the imaging coverage area is analyzed, and the expected attitude tracking to ground bunching imaging is deduced. In order to track the ground target as soon as possible, multi-axis simultaneous large-angle attitude maneuver control is required. In order to achieve ground-beam imaging of the SAR antenna, continuous tracking attitude maneuver needs to be performed after tracking the target. In this paper, the feedback flywheel control technology is used to design the PD controller based on bang-bang control with the best time, which can achieve the fast tracking of the ground target. In view of the system disturbance, the PD controller is used to design the front Fed into the compensator, thus ensuring the accuracy of attitude tracking. The attitude control system mathematical simulation results show that the control technique is effective.