机载SAR天线高精度指向稳定平台设计

Design of High-precision Stabilization Platformfor Airbone SAR

摘要:

针对无人机载合成孔径雷达(SAR)成像对天线波束指向的高稳定性要求,设计了一种基于组合导航的天线稳定平台控制系统。稳定平台采用滚转外框架和俯仰内框架式的万向支架结构形式,控制系统实时采集角位置传感器和组合导航数据信号,综合利用死区增益控制和自适应积分补偿控制方法,实现系统的高精度稳定指向控制。机载挂飞试验结果表明:控制系统可快速隔离机体姿态变化对波束指向的影响,且角位置误差小于0.1°。

Abstract:

Aiming at the requirement of high stability of antenna beam pointing forunmanned aerial vehicle (UAV) synthetic aperture radar ( SAR) imaging, an antennastabilization platform control system based on integrated navigation is designed, The stabilizationplatform adopts the gimbal structure of rolling outer frame and pitching inner frame. The controsystem collects the data signals of angular position sensor and integrated navigation in real time. Busing dead time gain control and adaptive integral compensation control method, the high precisionand stable pointing control of the system is realized, The results of airborne hang up test show thatthe control system can quickly isolate the influence of body attitude change on beam pointing, anothe angular position accuracy error is less than 0. 1.