基于图像和回波数据的多接收元SAS运动补偿方法

多接收元合成孔径声纳(SAS)可以提高声纳的测绘率,侧摆和偏航是影响多接收元SAS成像质量的关键因素.在深入研究收发合置SAS的基于回波数据估计运动误差算法的基础上,提出了一种估计多接收元SAS运动误差的方法.该算法允许声纳以满足空间采样理论的最大速度运行,利用每个脉冲回波数据的成像估计偏航,然后利用相邻脉冲回波数据的相关性估计侧摆.提出了一种既减少计算量又精确估计时延的方法.仿真结果表明新算法有效地估计出了侧摆和偏航,提高了成像质量.

Motion Compensation Method Based on Image and Receiving-data for Multi-hydrophone SAS

The multi-hydrophone synthetic aperture sonar (SAS) may increase mapping rate, and sway and yaw are the key factors which results in image blurring. Based on the receiving-data-based motion compensation method for a collocated SAS, a new motion compensation method for a multi-hydrophone SAS was proposed which allowed the multi-hydrophone SAS to travel at the maximum allowable speed as determined by the spatial sampling theorem. With this method, the yaw was estimated by the image from each ping echo firstly, and then the sway was estimated by cross-correlating two adjacent ping echoes. A method for estimating time delay accurately with minor computing load was given. Simulation results using the proposed algorithm show that the proposed algorithm estimates the sway and yaw effectively and the image quality is improved.