星载SAR天线阵面形变分析与补偿方法

研究了星载SAR天线阵面形变对波束输出的影响及形变补偿方法.针对未来星载SAR将采用的柔性阵面,提出了一种用于星载SAR天线的空间形变实时测量与控制的闭环系统,建立了阵面形变下阵列流形误差模型,得出小幅度形变主要影响波束的旁瓣输出,通过求解补偿形变权值的最小二乘解,使阵列形变补偿后波束输出与期望波束输出最佳逼近,并给出用于阵列误差补偿的阵列形变测量精度要求.仿真结果验证了本文方法结论的正确性与有效性.

Analysis and compensation of spaceborne SAR antenna array deformation

The beam output of deformed Spaceborne SAR antenna array and the deformation error compensation are studied.Considering the flexible antenna array which may be adopted in the future Spaceborne SAR,a closed loop system for measuring and controlling of Spaceborne SAR antenna array’s deformation is proposed,and the steering vector model of deformed antenna array is presented.It was found that the mild deformation affect the beam’s sidelobe output more than the beam’s main-lobe.Then,the compensated weights were solved by the least square method,which can approximate the deformed antenna array outputs to the original antenna array outputs at most.Next,the deformed antenna array measuring precise demand was worked out.The validity of this method is verified by simulation.