3D imaging performance analysis of multi-baseline Circular GBSAR

Traditional linear GBSAR can only image in the range-azimuth plane. It can't obtain elevation information of the target. Circular GBSAR is a new GBSAR model. Due to the advantage of resolution in the vertical direction, circular GBSAR can acquire the 3D image. However, the azimuth section of the single-baseline circular GBSAR image has high side lobes. In this paper, a multi-baseline circular GBSAR 3D imaging system using multiple antennas is proposed. Multiple antennas are fixed to the rotating arm, the rotating arm rotates in a vertical plane to form a circular synthetic aperture, and the antenna beam points directly in front. Multi-baseline circular GBSAR model can effectively reduce the side lobe of the azimuth section of the SAR image. In this paper we analyzed the effect of the multi-baseline circular GBSAR model on reducing the side lobes of the azimuth section and the special variation of point target imaging at different locations. By the simulation experiments, the 3D resolution ability of the multi-baseline circular GBSAR for different point targets is verified.