机载下视3D-SAR切航天线的机电耦合优化设计

Electromechanical Coupling Optimization Design on Cross-Track Antennas of Airborne Downward-Looking 3D-SAR

针对机载3D-SAR切航天线受机械振动影响,引起天线阵元位移,使其相位中心偏移,导致成像质量变差的问题.在分析线阵3D-SAR下视成像基本原理的基础上,建立了机械振动引起天线相位中心偏移、回波电信号变化的关系式.论述了切航天线的集成设计方法,并建立了其机电耦合优化模型.以Quickeye-4无人机载3D-SAR切航天线安装用支架的设计为例,说明了机电耦合综合优化模型建立、基于遗传算法求解的具体方法和步骤,其结果验证了设计方法的有效性.

Aiming at the effect of mechanical vibration on airborne 3D-SAR antenna which causes thedisplacement of the antenna element and the shift of the phase center,and then leads to the result in poor imaging quality,the expression of the shift of the phase center of the antenna and corresponding expression of the change of the electrical echo signal through demodulated and compressed which are caused by mechanical vibration are established,after analyzing the basic principle of visual imaging under linear array 3D-SAR.The integrated design method of the cross-track antenna is discussed,and its electromechanical coupling optimization model is set up.The design on the holder of 3D-SAR cross-track antenna mounted on a Quickeye-4 unmanned aerial vehicle is taken as an example to illustrate the detailed approach and procedure of modeling and solvingby Genetic Algorithm.Its result confirms the effectiveness of the proposed method in this paper.