Target Echo Strength Software Benchmarking – Tasks 1 and 2 Under Canada-Netherlands-Sweden Project Arrangement on Target Echo Strength

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Authors
  1. Gilroy, L.
  2. Karasalo, I.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
As part of the Canada-Netherlands-Sweden Project Arrangement on Target Echo Strength (TES), Canada and Sweden agreed to benchmark their software tools for predicting TES using relatively simple geometric models. This was the first of two steps, the second being the comparison of these software tools against experimental submarine data. In this study, Defence Research and Development Canada (DRDC) and Swedish Defence Research Agency (FOI, Totalförsvarets forskningsinstitut) used their boundary element, Kirchhoff approximation, and ray tracing codes to evaluate a rotationally symmetric ellipsoid, a cylinder with one hemispherical and one flat endcap, and an airfoil—all sized similar to their related submarine structures. In general, for each technique, results from the various implementations agreed fairly well. Both DRDC and FOI showed results from boundary element codes, Kirchhoff approximation codes, and ray tracers, while DRDC also added results from the analytically-based BASIS code. As expected due to their formulation, the DRDC Kirchhoff and ray tracing codes do not accurately predict forward scatter when performing bistatic predictions. Even excluding this forward scatter, the FOI Kirchhoff codes (two versions) generally performed slightly better than the DRDC version, although differences were small. Both boundary element codes agreed quite well, but were limited to about 3 kHz (for this size model) by computer memory limitations. Again, excluding forward scatter, t

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Keywords
target echo strength;cylinder;airfoil;ellipse;benchmark
Report Number
DRDC-RDDC-2017-R091 — Scientific Report
Date of publication
01 Aug 2017
Number of Pages
57
DSTKIM No
CA045206
CANDIS No
805599
Format(s):
Electronic Document(PDF)

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