Title :
High-resolution interferometry for multibeam echosounders
Author :
Pujol, Gerard Llort ; Sintes, C. ; Lurton, Xavier
Author_Institution :
GET-ENST Bretagne, CNRS UMR, Brest, France
Abstract :
Two main approaches are met today in swath bathymetry sonar systems. Interferometric sidescan sonars use the phase difference between two (or more) close receivers to estimate the arrival angle of instant signal. Multibeam echosounders (MBES) use beamforming methods (prior to amplitude or phase detection) in order to obtain an intrinsic spatial resolution and to improve the received signal to noise ratio (SNR). Here we present a comparison between the interferometry method and high-resolution techniques. Experimental results obtained from data recorded with a Simrad EM300 30-kHz multibeam echosounder are presented, showing that both methods provide a similar DOA estimation.
Keywords :
acoustic wave interferometry; bathymetry; oceanographic techniques; sonar signal processing; 30 kHz; DOA estimation; MBES; SNR; Simrad EM300; beamforming methods; direction of arrival; high-resolution techniques; interferometric sidescan sonars; intrinsic spatial resolution; multibeam echosounders; signal to noise ratio; swath bathymetry sonar systems; Covariance matrix; Interferometry; Multiple signal classification; Phase measurement; Phased arrays; Sensor arrays; Signal to noise ratio; Sonar; Spatial resolution; Time measurement;
Conference_Titel :
Oceans 2005 - Europe
Conference_Location :
Brest, France
Print_ISBN :
0-7803-9103-9
DOI :
10.1109/OCEANSE.2005.1511738
