Robust direction-of-arrival by matched-lags, applied to gunshots
This work investigates the direction-of-arrival problem. A time-delay-estimate (TDE) obtained from a peak of a correlation function is subject to two types of error: type I, approximation errors, and type II, errors due to spurious signals. The iterative least-squares algorithm tentatively selects s...
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| Published in: | The Journal of the Acoustical Society of America Vol. 135; no. 6; p. EL246 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
United States
01.06.2014
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| ISSN: | 1520-8524, 1520-8524 |
| Online Access: | Get more information |
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| Summary: | This work investigates the direction-of-arrival problem. A time-delay-estimate (TDE) obtained from a peak of a correlation function is subject to two types of error: type I, approximation errors, and type II, errors due to spurious signals. The iterative least-squares algorithm tentatively selects spatially coherent subsets of TDEs containing no type II errors and minor contributions of type I errors ("matched-lags"). Simulations use a seven-microphone array and a gunshot signal. The evaluation methodology is rigorous, comparing empirical distribution functions of estimation error of algorithms through two-sample, one-sided Kolmogorov-Smirnov tests, and quantifying differences with Cohen's D. The direction-of-arrival estimate is improved, specifically at low signal-to-noise ratios. |
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| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1520-8524 1520-8524 |
| DOI: | 10.1121/1.4874223 |