Estimating and removing colorations from the deconvolved impulse response of an underwater acoustic channel.
The impulse response (IR) of an acoustic channel can be obtained by cross-correlating the received signal with the broadband excitation signal in unfavorable noise conditions. However, the deconvolved IR is colored by the IRs of the combined electrical equipment. This letter presents a time domain approach using pre-computed filters to whiten the unknown coloration in order to obtain the channel's time domain waveform. The method is validated with an image-source model and the IR of the channel is recovered with spectral root mean square error of -27 dB. Data results obtained from a pool experiment with non-calibrated equipment yield a whitened IR with standard deviation of 0.9 dB (30-68 kHz band).
Marine Physical Laboratory of the Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0238, USA gemba@ucsd.edu.
Kay L
KL
Gemba
Department of Ocean and Resources Engineering, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa, Honolulu, Hawaii 96822, USA nosal@hawaii.edu.
Eva-Marie
EM
Nosal
Department of Electrical Engineering, University of Hawai'i at Mānoa, Honolulu, Hawaii 96822, USA trreed@hawaii.edu.
Todd R
TR
Reed