Array element localization accuracy and survey design

Authors

  • Stan E. Dosso School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 3Y2, Canada
  • Gordon R. Ebbeson Defence Research and Development Canada-Atlantic, P.O. Box 1012, Dartmouth, NS B2Y 3Z71, Canada

Keywords:

Arrays, Optimal control systems, Signal receivers, Synchronization, Time measurement, Array element localization (AEL) methods, Optimal configurations, Survey design

Abstract

Accurate localization of the individual elements of an underwater acoustic receiver array is an important prerequisite to advanced array processing applications. Array element localization (AEL) methods are typically based on inverting acoustic arrival-time measurements from controlled sources at (approximately) known positions to the receivers to be localized. This paper presents and illustrates a general approach to AEL inversion and to AEL survey design based on quantifying the posterior receiverlocation uncertainty, taking into account uncertainties in the data, source locations, sound speed, and water depth. The inversion is based on a fast ray-tracing algorithm that employs Newton's method and the method of images to determine eigenrays for direct and reflected arrivals. The efficiency of this approach allows computationally intensive analysis such as Monte-Carlo appraisal and nonlinear optimization for designing optimal source configurations. These algorithms provide a rigorous approach that can be applied to examine all aspects of AEL accuracy and survey design, illustrated here by several examples. It is shown that synchronized AEL surveys (in which source transmission times are known) provide only a minor improvement over non-synchronized surveys (often much simpler logistically), and the difference can be made up by using more sources in an optimal configuration or by including additional arrivals. Including multiple-reflected arrivals improves receiver depth estimates (provided water depth is well known), but provides little improvement in horizontal localization.

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Published

2006-12-01

How to Cite

1.
Dosso SE, Ebbeson GR. Array element localization accuracy and survey design. Canadian Acoustics [Internet]. 2006 Dec. 1 [cited 2021 Jul. 25];34(4):3-13. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1851

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Section

Technical Articles

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