浅海低频远程混响时空相干特性研究

In active sonar applications, the dominant background is often sound reverberation. With the development of acoustic technology,the work frequency of sonar is lower. Water reverberation includes two tranmitting processes and one scatting process.In shallow water，long-range reverberation is mainly from bottom scattering. And the bottome charictristic is stable for a relaticvity time. In this item,the influence of time-space interference of reverberation is studied with the relationship of signal frequency,the position of transducor and receiver,distance between receivers and time-dalay between twice tranmiting. Especially the time stability of reverberation is emphasized .On the basis of the time-space correlation of reverberation and characteristics of target echo, we hope to put forward a new mathod to inhibit reverberation.

混响是主动式声纳的主要背景干扰之一，是海洋声学的一个重要课题。为了更有效的对目标进行探测，国内外声纳系统逐渐向低频发展。在浅海，较远距离的混响主要是由海底散射引起的，包括两次传播过程和一次散射过程。本项目拟通过理论法分析和海上实验，系统研究浅海低频远程混响声场的时空相干特性随频率、收发位置、接收器间距以及海洋环境变化规律。在此基础上，根据混响信号的时空变化规律、混响时间稳定性、混响空间方向性与目标回波空间特性的特点，提出抑制目标混响干扰的新方法和多基地主动声纳目标探测的新方法，为提高我国岸基主动声纳的探测性能提供理论基础和新的技术手段。