采用Vernier阵技术的SAS图像重建

在采用Vernier阵技术时，为了避免由于等效相位中心(DPC)近似而引起的合成孔径声纳(SAS)图像模糊，提出一种新的数据处理方法，该方法根据收发分置成像的几何特性，采用修正的距离一多普勒算法对单个接收元信号独立进行合成孔径处理，并将独立处理产生的所有图像相干叠加，得到SAS系统的高分辨图像。对DPC近似处理、单个接收元合成孔径处理以及相干叠加处理的计算机仿真结果进行了比较，结果验证了该处理方法的可行性和有效性，并且进一步验证了Vernier阵技术的高分辨特性。

Image Reconstruction for Synthetic Aperture Sonar (SAS) System with Vernier Array Technique

To overcome the blurring problem caused by displaced phase center (DPC) approximation, a modification of the standard range-Doppler (R-D) algorithm is proposed to process the Vernier array data based on the bistatic sonar model, and to reconstruct the target area from the data of the individual transmitter/receiver pair. If there are H receivers, H individual images are obtained. All the individual images are then coherently added to form the final high resolution SAS image. Simulation results by the DPC approximation processing, modified R-D algorithm and coherent addition are presented. They show that the image blurring caused by DPC approximation can be removed by using the modified R-D algorithm, both the range resolution and azimuth resolution can be obviously improved after coherent addition. The simulation results validate the feasibility and validity of the new method.