Direct measurement and matched-field inversion approaches to array shape estimation

Accurate knowledge of array shape is essential for carrying out full wavefield (matched-field) processing. Direct approaches to array element localization (AEL) include both nonacoustic (tilt-heading sensors) and acoustic (high-frequency, transponder-based navigation) methods. The low-frequency sign...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 1996-10, Vol.21 (4), p.393-401
Main Authors: Hodgkiss, W.S., Ensberg, D.E., Murray, J.J., D'Spain, G.L., Booth, N.O., Schey, P.W.
Format: Article
Language:English
Subjects:
Acoustic arrays
Acoustic emission
Acoustic measurements
Acoustic sensors
Apertures
Marine
Navigation
Packaging
Sensor arrays
Shape
Transponders
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Summary:Accurate knowledge of array shape is essential for carrying out full wavefield (matched-field) processing. Direct approaches to array element localization (AEL) include both nonacoustic (tilt-heading sensors) and acoustic (high-frequency, transponder-based navigation) methods. The low-frequency signature emitted from a distant source also can be used in an inversion approach to determine array shape. The focus of this paper is on a comparison of the array shape results from these three different methods using data from a 120-m aperture vertical array deployed during SWellEx-3 (Shallow Water evaluation cell Experiment 3). Located 2 m above the shallowest array element was a self-recording package equipped with depth, tilt, and direction-of-tilt sensors, thereby permitting AEL to be performed non-acoustically. Direct AEL also was performed acoustically by making use of transponder pings (in the vicinity of 12 kHz) received by high-frequency hydrophones spaced every 7.5 m along the vertical array. In addition to these direct approaches, AEL was carried out using an inversion technique where matched-field processing was performed on a multitone (50-200 Hz), acoustic source at various ranges and azimuths from the array. As shown, the time-evolving array shape estimates generated by all three AEL methods provide a consistent picture of array motion throughout the 6-h period analyzed.
ISSN:0364-9059
1558-1691
DOI:10.1109/48.544050