LI Rongyan^1,2  MA Yuanliang²  YANG Kunde²

(1 School of Electronics and Information Engineering, Tongji University  Shanghai  200092)

(2 Institute of Acoustics Engineering, Northwestern Polytechnical University  Xi'an  710072)

Received Jun.24, 2006

Revised Nov.28, 2006 

Abstract  This paper proposed a method for blind estimation of underwater channels in shallow water environment by using received data at a single hydrophone or from single beam. First, the received signal is used for source signal reconstruction by means of signal-dependent TF (Time-Frequency) distribution, in association with instantaneous frequency estimation and TF inversion. Then the shallow-water channel estimation is achieved via WRELAX technique by use of the received signal and the estimated source signal. Finally, the results of numerical simulation and experimental test from real data taken in South China Sea trial have proved satisfactory. It is shown that the proposed method is useful for underwater channel estimation.

PACS number: 43.30, 43.60