Localizing scatterers from surf noise cross correlations.
The backscattered travel-time structure is obtained by cross-correlating air-acoustic ocean surf noise recorded on microphone pairs (separation ∼2 m) on the beach. The scatterer is a 20 cm radius Polyvinyl chloride pipe 2.5 m landside of the microphone array. Arrivals corresponding to the time-difference (travel-time difference between two scatterer-receiver paths) and scattered (travel time for receiver-scatterer-receiver path) waves emerge in the cross-correlation functions in a backscattering configuration. Theoretically, only a microphone pair is needed to locate the scatterer using the time-difference and scattered travel times. Localization of the scatterer is demonstrated with the microphone array on the beach.
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China.
Jie
J
Li
Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093-0238, USA jil004@ucsd.edu, gerstoft@ucsd.edu, dzgao@ouc.edu.cn, zhenglimuyun@sina.com, wangyu@public.qd.sd.cn.
Peter
P
Gerstoft
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China.
Dazhi
D
Gao
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China.
Guofu
G
Li
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China.
Ning
N
Wang