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On the relationship between SAS image resolution and target-detection performance

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Abstract
The relationship between synthetic aperture sonar (SAS) image resolution and target-detection performance is quantified. It is first demonstrated how a lower-resolution SAS system can be simulated in a principled manner by band-limiting the image wavenumber spectrum of a full-resolution SAS image. This insight enables a direct comparison of target-detection performance in imagery of different resolutions while all other variables (such as data-collection conditions) remain fixed. The comparison is achieved by degrading a given SAS image to a series of different along-track resolutions and range resolutions, and then applying the same detection algorithm to the resulting set of images. This is repeated on a large scale for a set of real SAS data collected at sea at eight different geographical locations in various environmental conditions; the data considered comprise over 1500 images collectively spanning over 8 square-kilometres of seabed and containing over 2000 mine-like targets. The results quantify the dependence of target-detection performance and false alarm rate on along-track resolution and range resolution. This information can be used to determine the minimum processing requirements needed on board an autonomous underwater vehicle for effective through-the-sensor survey adaptation, and also to inform SAS system design and procurement decisions.

URI
http://hdl.handle.net/20.500.12489/871

Report Number
CMRE-PR-2019-131

Source
In: Proceedings of the OCEANS 2015 MTS/IEEE Conference, 18-21 May 2015, Genoa, Italy, doi: 10.1109/OCEANS-Genova.2015.7271377

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Date
2019/06

Author(s)
Williams, David P.
; 
Hunter, Alan Joseph

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CMRE-PR-2019-131.pdf (3.825Mb)

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