NDLI: Maximum Likelihood Approach to Bottom Detection in Deep Water MultiBeam Echo Sounders

Content Provider	IEEE Xplore Digital Library
Author	Yufit, G. Maillard, E. Pedersen, L.D.
Copyright Year	2007
Description	Author affiliation: RESON Inc., Slangerup (Yufit, G.; Maillard, E.; Pedersen, L.D.)
Abstract	The maximum likelihood method (MLM) of bottom detection allows substantial reduction in the minimum acceptable SNR in outer beams and, as a result, widening of the survey swath in deep water multi-beam echo sounder (MBES) applications. In this discussion, the arrays are installed in a Mills Cross configuration, with the transmit array oriented along-track and the receive array oriented across-track. The statistics consist of amplitude time samples and samples of phase differences between the two halves of the receive array. Transition to Cartesian coordinates allows for obtaining the inverse of the correlation matrix and, consequently, expression of the normal statistical distribution for the output of the two sub-arrays. Maximizing this distribution by depth (or by depth and surface slope) leads to finding the optimal position of bottom response in range or in time. The location of the signal peak determines the optimal estimate of range and gives bottom depth. Implementation of MLM gives the gain in SNR equal to ~3 -4 dB and up to a 15% increase in swath. The MLM approach is illustrated by data recorded in deep water in South China Sea during a trial of SeaBat 8150 MBES.
Starting Page	162
Ending Page	165
File Size	3051501
Page Count	4
File Format	PDF
ISBN	1424412072
DOI	10.1109/UT.2007.370846
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-04-17
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Maximum likelihood detection Polynomials Phased arrays Gravity Phase estimation Maximum likelihood estimation Statistical distributions Acoustic scattering Phase detection Phase frequency detector
Content Type	Text
Resource Type	Article

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