Abstract
Matched field processing (MFP) typically exploits acoustic mode structure using both mode shapes and wave numbers to estimate source location. It is also possible to use mode shapes alone to estimate source depth [E. C. Shang, J. Acoust. Soc. Am. 77, 1413–1418 (1985); T. C. Yang, ibid. 82, 1736–1745 (1987)]. Measurements of multiple frequency towed source transmissions using a vertical line array spanning the lower duct of a summer sound-speed profile (SwellEx 96) were used to compare conventional MFP processing with several variants of mode-shapes-only depth estimation. Sensitivity of these processes to reduced aperture, array tilt, and signal-to-noise ratio was studied in simulated and measured data. Array tilt mismatch was successfully corrected to improve source localization results significantly.
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