DocumentCode :
952226
Title :
VLF source localization with a freely drifting acoustic sensor array
Author :
Chen, George C. ; Hodgkiss, William S.
Author_Institution :
US Naval Command Control, San Diego, CA, USA
Volume :
18
Issue :
3
fYear :
1993
fDate :
7/1/1993 12:00:00 AM
Firstpage :
209
Lastpage :
223
Abstract :
The source localization and tracking capability of the freely drifting Swallow float volumetric array is demonstrated with the matched-field processing (MFP) technique using the 14-Hz CW data collected during a 1989 float experiment conducted in the northeast Pacific. Initial MFP of the experimental data revealed difficulties in estimating the source depth and range while the source azimuth estimate was quite successful. The main cause of the MFP performance degradation was incomplete knowledge of the environment. An environment adaptation technique using a global optimization algorithm was developed to alleviate the environmental mismatch problem, allowing the ocean-acoustic environment to be adapted to the acoustic data in a matched-field sense. Using the adapted environment, the 14-Hz source was successfully localized and tracked in azimuth and range within a region of interest using the MFP technique at a later time interval. Two types of environmental parameters were considered, i.e., sound speed and modal wave number. While both approaches yield similar results, the modal wave number adaptation implementation is more computationally efficient
Keywords :
acoustic arrays; acoustic signal processing; digital simulation; oceanography; optimisation; parameter estimation; signal detection; tracking; underwater sound; 14 Hz; VLF source localization; azimuth estimate; controlled simulation; environment adaptation; environmental mismatch; float experiment; freely drifting Swallow float volumetric array; freely drifting acoustic sensor array; global optimization algorithm; matched-field processing; modal wave number; northeast Pacific; ocean-acoustic environment; range; sound speed; source depth; tracking; Acoustic arrays; Acoustic measurements; Acoustic propagation; Acoustic sensors; Acoustic signal detection; Acoustic waves; Adaptive arrays; Degradation; Sea measurements; Sensor arrays;
fLanguage :
English
Journal_Title :
Oceanic Engineering, IEEE Journal of
Publisher :
ieee
ISSN :
0364-9059
Type :
jour
DOI :
10.1109/JOE.1993.236359
Filename :
236359
Link To Document :
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