一种新型圆迹阵列三维SAR系统的点扩散函数分析与地面实验结果

PSF Analysis and Ground Test Results of a Novel Circular Array 3-D SAR System

阵列合成孔径雷达(ASAR)具备3维成像能力,是3维SAR成像领域的研究热点之一。该文针对线阵SAR在高分辨率成像方面和圆周SAR在旁瓣抑制方面的问题,提出一种新型圆迹阵列合成孔径雷达(CASAR)系统用于3维高分辨率雷达成像。首先推导基于CASAR系统的点扩散函数模型,从理论上分析圆迹阵列这一新型构型在3维成像中的优势。在此基础上构建原型CASAR实验系统,通过点扩散函数仿真实验和室外实测3维CASAR成像实验验证了3维CASAR成像的有效性,与线阵SAR和圆周SAR实验结果相比,证明CASAR系统可获得3维高分辨率SAR图像以及有效的旁瓣抑制能力。

Array Synthetic Aperture Radar(ASAR)system radar imaging field has gained attention because of its three-dimensional(3-D)imaging ability.A novel Circular Array SAR(CASAR)system is employed for 3-D high-resolution radar imaging to overcome the drawbacks exhibited by linear array SAR in high-resolution imaging and by circular SAR in side-lobe suppression.Point Spread Function(PSF)model based on the CASAR system is derived,and the advantages of the new configuration of the circular array in 3-D imaging are theoretically analyzed.Prototype CASAR experimental system is built on the basis of the abovementioned analysis.PSF simulation experiments and outdoor 3-D CASAR imaging experiments under outdoor conditions are performed to verify performance of the CASAR system in 3-D SAR imaging.Compared imaging results acquired using linear array SAR,circular SAR,and CASAR system proves that the CASAR system has highresolution 3-D SAR images and demonstrates effective side-lobe suppression capability.