雷达天线稳定平台的模糊PID控制设计

Design of Fuzzy PID Control for Stable Platform of Radar Antenna

针对合成孔径雷达(SAR)清晰成像的特点,为保证雷达天线波束指向稳定,设计了某型机载雷达天线稳定平台;为了消除雷达天线稳定平台控制中存在的非线性及不确定性因素的影响,提出了一种应用于雷达天线稳定平台控制系统的模糊PID控制策略;稳定平台是依据陀螺仪所采集载机的角速度,运用反向运动补偿的原理进行工作;控制策略中,在传统PID控制的基础上引入模糊控制算法,根据跟踪误差信号动态改变PID控制器参数,改善稳定平台的控制效果,完成稳定平台控制器的优化设计;仿真结果表明,优化后的模糊PID控制算法与传统PID控制算法比较,在稳定平台转速控制方面受到的外部干扰影响更小,响应速度更快;因此,基于模糊PID控制算法的雷达天线稳定平台具有更高的稳定性能。

Considering the characteristic of the imaging of SAR, the stable platform of radar antenna is designed to guarantee the stabili- ty of radar antenna beam pointing. In order to eliminate the influence of the nonlinear and uncertain factors in the stable platform of radar antenna, a fuzzy PID control strategy is proposed for the stable platform control system. Stable platform works by using the principle of re- verse motion compensation according to the angular velocity of the aircraft collected by gyroscope. To improve the control effect of stable platform, the optimal design of stable platform controller has been designed by introduced fuzzy control algorithm based on conventional PID control and it dynamically changes PID parameters by tracking error signal. Compared with the conventional PID control algorithm, the simulation result shows that the fuzzy PID control algorithm affected by external interference is smaller and response faster in the application of stable platform revolution control. Therefore, the stable platform of radar antenna based on the fuzzy PID control algorithm has more stable performance.