多接收阵合成孔径声纳数据滤波重构算法

Data reconstruction for Multi-receiver SAS

在合成孔径声纳(Synthetic Aperture Sonar,SAS)成像中,多接收阵模式通常采用等效相位中心(Displaced Phase Center,DPC)近似处理方法,它实质上是将多接收阵回波数据与单接收阵回波数据的区别看成系统误差,在成像处理前或成像处理过程中补偿掉该系统误差,但是该系统误差具有空变特性,只能针对波束中心和场景中心近似补偿,做不到精确补偿。舍弃了DPC近似处理思想,采用多通道滤波器组重构方法,将多接收阵数据转化为单接收阵的形式,并针对该方法在宽带和宽测绘带两方面之间的矛盾提出了一种改进的处理方法,仿真结果验证了该方法的有效性。

In Synthetic Aperture Sonar（SAS） imaging,the displaced phase center（DPC） is often adopted approximately to deal with the multi-receiver data,which essentially takes the data difference between single-receiver and mul-ti-receiver as system error.The system error can be compensated before or during imaging,but it varies with space,and only the center of the beam or scene can be compensated accuracy.In order to solve this problem,the DPC ap-proximate processing is given up and the multi-channel filter-bank is used to transform multi-receiver data into sin-gle-receiver data in this paper,and for clearing up the conflict between wide-band and wide-scene,an improved algo-rithmic is proposed.Simulation results show the validity of this algorithm.