Design of High-precision Airborne SAR Stabilization Platform Based on Active Disturbance Rejection Technology

Abstract

An antenna stabilization platform based on active disturbance rejection (ADRC) technology is designed to compensate for the motion disturbance caused by the movement of the antenna beam pointing at the carrier aircraft in synthetic aperture radar (SAR) imaging. In this paper, the unavoidable friction disturbance torque in the stable platform and servo mechanism is analyzed, and the extended state observer is used to compensate for the disturbance torque so as to improve the pointing accuracy. The effectiveness of the algorithm is verified by digital simulation and semi-physical tests. The test results show that the airborne SAR stabilization platform designed with active disturbance rejection technology can effectively improve the pointing accuracy of the SAR antenna, and the performance is improved by more than 30%.