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对非刚性水下目标和事件的检测是水下安全警戒的重要内容之一。论文以港口疏浚导致的短时海区内高浓度沙泥侵入为例,探索基于声传感器收发分置的非刚性水下目标检测方法。基于沙泥沉降和声线传播模型,研究非刚性目标在沉降过程中形状、位置变迁对声传播能量及结构的影响规律。计算机仿真与海上实验均表明,局部高浓度泥团在沉降过程中,其形状、密度等指标参数会随时间发生变迁,并对经过其沉降区域的声线能量及结构造成明显影响。通过检测接收声信号能量、结构随沙泥沉降变迁的关系,可实现对水下侵入目标存在性的检测,并为开展进一步的反演、跟踪提供支持,具有一定的研究意义和参考价值。
The detection of non-rigid underwater targets and events is one of the important contents of underwater safety alert. In this paper, a case study of non-rigid submarine target detection based on the acoustic sensor transmitting and receiving disintegration caused by the dredging of high concentrations of sand in the short-term sea area is taken as an example. Based on the model of sand sediment settlement and sound ray propagation, the influence of shape and position changes of non-rigid target on acoustic propagation energy and structure during settlement is studied. Both computer simulation and offshore experiments show that the parameters such as shape and density of local high-concentration mud mass will change with time and significantly affect the sound energy and structure of the settlement through the subsidence area. By detecting the energy of the received acoustic signal and the relationship between the structure and the sediment change, the detection of the existence of underwater invaded targets can be realized, and it provides support for further inversion and tracking, which has certain research significance and reference value.