多接收子阵合成孔径声呐图像坐标校正

Image coordinate correction of multiple-receiver synthetic aperture sonar

为了解决合成孔径声呐(SAS)成像中图像域与信号域中的方位向参考原点不统一会导致图像方位坐标偏移,距离向参考原点不统一会导致图像距离向坐标偏移且方位向散焦的问题.首先根据不同的发射阵位置,建立了多接收子阵SAS通用的几何模型;然后根据SAS图像的方位向与距离向坐标偏移特性,分别提出了方位向与距离向坐标校正方法;最后通过仿真实验与实测数据验证了提出的图像坐标校正方法的有效性.

To solve the problem that the difference between the image domain and the signal domain in azimuth reference origin will cause the azimuth coordinate offset,and the difference in range reference origin will cause the range coordinate offset and azimuth defocus in the synthetic aperture sonar(SAS) imaging.First,a general geometry model of multiple-receiver SAS was established for different transmitter positions.Then,according to the characteristics of the coordinate offset of SAS images in azimuth and range direction,the azimuth and range coordinate correction methods were proposed,respectively.Finally,the effectiveness of the proposed coordinate correction methods was verified by simulation experiment and real data.