Comparison of Acoustic and Non-Acoustic Methods of Vertical Line Array Element Localization.
NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
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SWellEx-3 Shallow Water evaluation cell Experiment 3 was conducted in July 1994 west of Point Loma in 200-m water. During the experiment, a MPL 64-element, 120-m aperture vertical array was deployed on the ocean bottom from the RIP FLIP. Located 2 m above the shallowest array element was a self-recording package equipped with depth, tilt, and direction-of-tilt sensors, thereby permitting array element localization AEL to be performed nonacoustically. In addition, AEL was performed acoustically using two different approaches. The first approach made use of transponder pings in the vicinity of 12 kHz received by high-frequency hydrophones spaced every 7.5 m along the vertical array. The second approach was based on a self-cohering technique where matched-field processing was performed on a low-frequency, multitone 50-200 Hz sound source being towed at various ranges and azimuths from the array. The focus of this paper is on a comparison of the time-evolving array shape estimates generated by these three different methods. As shown, all three provide a consistent picture of array motion throughout the 6 hour period analyzed.
- Acoustic Detection and Detectors