Research On Control Technology Of 07MD Radar Antenna Stabilized Platform

Synthetic Aperture Radar(SAR)is a kind of high-resolution imaging radar that can obtain high-resolution images similar to optical photography in extremely low visibility or other severe meteorological conditions.It is widely used in many fields such as military investigation and civil monitoring.The premise for SAR to obtain a clear and stable image is that the radar antenna moves in a straight line with respect to the target.In practice,SAR is always subject to many disturbances including the carrier,resulting in radar imaging ambiguity.The radar antenna stabilization platform is a key equipment that can isolate external disturbances and ensure the stable operation of the radar antenna.Its superior performance directly affects the imaging accuracy of the radar antenna.The main task of the radar antenna stabilization platform is to suppress the interference of various disturbances to the stable operation of the radar antenna.Under certain conditions of the mechanical structure and processing and assembly technology of the radar antenna stabilization platform,the quality of the control algorithm determines the stability accuracy of the radar antenna stabilization platform.This paper takes the 07 MD radar antenna stabilization platform as the research object,and proposes an improved radar stabilization platform active disturbance rejection control algorithm for the shortcomings of the existing algorithm,which effectively improves the antijamming performance of the stabilized platform.This article analyzes the mechanical structure of the 07 MD radar antenna stabilization platform,mathematically modeling the 07 MD radar antenna stabilization platform,and analyzes various disturbance factors that the stabilized platform suffers.By establishing the coordinate system of each axis,the principle of stable platform angular velocity stabilization and the coupling between the axes are analyzed to obtain the angular velocity that each axis should compensate.The components of active disturbance rejection control(ADRC)are analyzed and studied.The shortcomings of the traditional ADRC are analyzed by simulation experiments,and according to the essence of the extended state observer(ESO),an improved active disturbance rejection controller is proposed by changing its input error signal.Stability analysis and comparison between simulation and traditional active disturbance rejection control verify its effectiveness and superiority.The model of the 07 MD radar antenna stabilization platform is simplified,and the specific transfer function is obtained according to the selected motor parameters.Based on the simplified model,the improved 07 MD radar antenna stabilization platform auto-disturbance controller algorithm is adjusted,and the parameters of each component are adjusted.The comparison of MATLAB simulation experiment with PID and traditional ADRC verifies the superior anti-interference performance of the improved 07 MD radar antenna stabilization platform.