In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3991-3991
Abstract:
The array invariant proposed for robust source-range estimation in shallow water is based on the dispersion characteristics in ideal waveguides, utilizing multiple arrivals separated in beam angle and travel time for broadband signals. Recently, the array invariant was extended to general waveguides by incorporating the waveguide invariant β, referred to as a generalized array invariant. In range-dependent environments with a sloping bottom, the waveguide invariant β is approximately proportional to the source range via the water depth. Assuming knowledge of the bottom slope, the array invariant can be applied iteratively starting with β = 1 in shallow water, which converges toward the correct source range in a zigzag fashion. The iterative array invariant approach is demonstrated in a sloping-bottom shallow-water waveguide using a short-aperture vertical array (2.8 m) from the Random Array of Drifting Acoustic Receivers 2007 experiment (RADAR07), where a high-frequency source (2-3.5 kHz) close to the surface (6-m) was towed between 0.5 to 5 km in range with the corresponding water depth being 80 and 50 m, respectively.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2017
detail.hit.zdb_id:
1461063-2
