Naval Institute of Underwater Acoustic Technology, Naval University of Engineering, Wuhan 430033, China.
Sensors (Basel). 2018 Jun 22;18(7):2000. doi: 10.3390/s18072000.
A correction approach for the inclined array of hydrophones is proposed to prevent decline of the image quality in SAS. In this approach, the 2-way exact acoustic propagation path of the inclined array is transformed into the sum of a single root term and an offset term, where the single root term is the 2-way ideal propagation path and the offset term contains all errors cause by the inclined array. The correction for the offset term is separated into two steps: phase correction and delay correction. The phase correction is performed on the echo signal of each receiving hydrophone in the 2-D time domain by a phase multiplication and the delay correction is performed on the echo signal of each receiving hydrophone in the range frequency domain by a phase multiplication with a linear function of range frequency at the reference range. Finally, the effectiveness of the proposed approach is examined by the simulation experiments.
提出了一种用于斜阵水听器的校正方法，以防止 SAS 中图像质量下降。在该方法中，将斜阵的 2 路精确声波传播路径转换为单个根项和偏移项的和，其中单个根项是 2 路理想传播路径，而偏移项包含由斜阵引起的所有误差。对偏移项的校正分为两步：相位校正和延迟校正。相位校正通过相位乘法在每个接收水听器的二维时域中的回波信号上进行，而延迟校正通过在参考距离处的距离频率的线性函数的相位乘法在距离频率域中的每个接收水听器的回波信号上进行。最后，通过仿真实验检验了所提出方法的有效性。
