水下小尺度目标宽带亮点回波建模及实验验证

Modeling and Verification of Highlight Broadband Echo for Underwater Small Scale Target

准确、有效的目标回波模型是声纳目标,特别是小尺度目标探测与识别的基础。基于声纳目标亮点回波3参数模型以及时域特征分析在声纳目标探测与识别中的有效性,将反映目标回波时域特征的参量作为声纳目标回波模型的建模参数,优化了目标亮点回波模型。针对单频水声探测在小尺度目标识别中无法兼顾距离与精度的局限性,提出了基于频带划分算法的宽带回波模型建模方法,为水下小尺度目标的宽带探测与识别提供了理论基础。通过设计验证试验,将所建模型仿真数据与实物模型消声水池试验回波数据进行对比分析,结果表明,模型仿真回波与试验回波数据具有一致性,验证了所建回波模型的准确性与有效性。

An accurate and effective sonar target echo ：model is a basis of detecting and recognizing sonar target, especially small scale target. In this paper, based on three parameter models of highlight echoes of sonar targets and the characteristic analysis in time domain for sonar target detecting and recognizing, the target echo model is optimized by using the parameter of echo time domain characteristic. Furthermore, a method of modeling broadband echo is proposed based on the algorithm of dividing frequency band in order to overcome the limitation that the single frequent detection method is unable to simultaneously consider both distahoe and precision in small target recognition,. The comparison of the echoes from simulation and anechoic tank test verifies the accuracy and validity of the echo models.