YAN Liming1　  LI Jianlong1　  PAN Xiang1　  ZHAO Hangfang1,2　  ZHU Hengnian2

(1 Department of Information Science and Electronic Engineering,

Zhejiang University  Hangzhou 310027)

(2 State Key Laboratory of Oceanic Acoustics, Hangzhou

Applied Acoustics Research Institute Hangzhou 310012)

Received Jun. 18, 2008

Revised Nov. 7, 2008

Abstract The hypothesis test of detecting presence and absence of a target in a highly reverberant environment using techniques of time-reversal focusing with interaction of transmission and reception was studied. Time-reversal (TR) focusing with interaction of transmission and reception is as follows: a PS (Probe Source) is located near the object to generate signal, the SRA (Source Receiver Array) receives the signal transmitted by the PS and focused the signal at the location of the object by physical TR focusing (i.e., inverse beamforming with multi-path compensated). TR transmission array and reception array interactively focus the echo scattering by the object with algorithmic TR focusing (i.e., beamforming with multi-path compensated). Meanwhile the conventional BS (broadside) transmission detection and TR detection are compared. The experiment was conducted in the Laboratory Waveguide to prove the theoretical analyses and results. It follows that the TR detection get more gain on echo-to-reverberation ratio than the conventional BS transmission detection.　 

PACS numbers: 43.30, 43.60