物理学报2017，Vol.66Issue(19)：150-158,9.DOI:10.7498/aps.66.194304
利用海浪噪声自相关实现散射体无源探测
Passive detection of scatterer using autocorrelation ofsurf noise
摘要
Abstract
When a scatterer is located in a diffuse noise field, time domain Green's function between two different receivers can be extracted from cross-correlation of ambient noise which is recorded by the two receivers so that target detection can be implemented. However, the method based on cross-correlation strongly depends on timing synchronization of each receiver, otherwise there will be a time drift in the cross-correlation result, which can bring error in the positioning detection. Besides, two receivers that are far from each other must communicate with each other to implement cross-correlation in real-time data processing, but big data transmission is difficult in the ocean. Compared with cross-correlation, autocorrelation means that each receiver works independently and only the final autocorrelation result is to be transmitted. Actually, the scattered wave of target is always so weak that it is submerged in the autocorrelation result of the ambient noise. In this paper, we propose a method of processing the autocorrelation of the ambient noise. When the averaging noise autocorrelation of all receivers is subtracted from the autocorrelation result of the noise recorded by each receiver, the signalnoise ratio of the scattered wave will be significantly enhanced. With the help of Kirchhoff migration algorithm, detection of a scatterer can be implemented. We have conducted a scatterer passive detection experiment in Shilaoren beach, Qingdao, and accurately detected the position of a polyviny chloride pipe (about 8 m away from the nearest receiver) using only 12 min surf noise data. The experimental result shows that the processing of autocorrelation could replace cross-correlation in passive target detection when the ambient noise is time steady and the statistical characteristics of the background noise at different receivers are the same. Unlike Green's function extracted from cross-correlation of ambient noise, each receiver can work independently without considering the problems of massive data transmission and timing synchronization, which may be suitable for target detection using multi-receivers and mobile platform.关键词
噪声自相关/散射体被动探测/安静目标Key words
autocorrelation of ambient noise/passive detection of scatters/silent target引用本文复制引用
迟静,李小雷,高大治,王好忠,王宁..利用海浪噪声自相关实现散射体无源探测[J].物理学报,2017,66(19):150-158,9.基金项目
国家自然科学基金(批准号:11674294, 11374270, 11374271)和青岛海洋科学与技术国家实验室基金(批准号: QNLM2016ORP0106)资助的课题.Project supported by the National Natural Science Foundation of China (Grant Nos. 11674294, 11374270, 11374271) and the Foundation of Qingdao National Laboratory for Marine Science and Technology, China (Grant No. QNLM2016ORP0106). （批准号:11674294, 11374270, 11374271）
