Tracking European bat species with passive acoustic directional monitoring
We have developed a method of animal localisation that detects the angle from a sensor towards the direction of an animal call. The method is as simple to use as deploying a conventional static sound recorder, but provides tracking information as well as sound recordings. The principal of operation...
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ftdatacite:10.48550/arxiv.2001.07121 2023-05-15T17:48:37+02:00 Tracking European bat species with passive acoustic directional monitoring Wallis, David Elmeros, Morten 2020 https://dx.doi.org/10.48550/arxiv.2001.07121 https://arxiv.org/abs/2001.07121 unknown arXiv arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Populations and Evolution q-bio.PE FOS Biological sciences Article CreativeWork article Preprint 2020 ftdatacite https://doi.org/10.48550/arxiv.2001.07121 2022-03-10T16:15:46Z We have developed a method of animal localisation that detects the angle from a sensor towards the direction of an animal call. The method is as simple to use as deploying a conventional static sound recorder, but provides tracking information as well as sound recordings. The principal of operation is to detect the phase difference between microphones positioned closely together. The phase is detected by converting the signals to their analytic form with a Hilbert transform. The angle is then calculated from the phase difference, frequency and microphone separation. Angular measurements provide flight paths above the sensor, and can give details of activity and behaviour that are not possible with a single channel static recorder. We recorded flight paths for 5 bat species on a single night at a site in Denmark (Pipistrellus nathusii, Pipistrellus pygmaeus, Eptesicus serotinus, Myotis daubentonii and Nyctalus noctula). The median error in angular measurement for the species was between 3 and 7 degrees. Calls at high angles from normal, corresponding with a poor signal-to-noise ratio, had larger errors compared to calls recorded in the centre of the field of view. Locations in space could be estimated by combining angular measurements from two or more sensors. : Submitted to Bioacoustics (Taylor and Francis) 15 Nov. 2019 Article in Journal/Newspaper Nyctalus noctula Pipistrellus nathusii DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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unknown |
topic |
Populations and Evolution q-bio.PE FOS Biological sciences |
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Populations and Evolution q-bio.PE FOS Biological sciences Wallis, David Elmeros, Morten Tracking European bat species with passive acoustic directional monitoring |
topic_facet |
Populations and Evolution q-bio.PE FOS Biological sciences |
description |
We have developed a method of animal localisation that detects the angle from a sensor towards the direction of an animal call. The method is as simple to use as deploying a conventional static sound recorder, but provides tracking information as well as sound recordings. The principal of operation is to detect the phase difference between microphones positioned closely together. The phase is detected by converting the signals to their analytic form with a Hilbert transform. The angle is then calculated from the phase difference, frequency and microphone separation. Angular measurements provide flight paths above the sensor, and can give details of activity and behaviour that are not possible with a single channel static recorder. We recorded flight paths for 5 bat species on a single night at a site in Denmark (Pipistrellus nathusii, Pipistrellus pygmaeus, Eptesicus serotinus, Myotis daubentonii and Nyctalus noctula). The median error in angular measurement for the species was between 3 and 7 degrees. Calls at high angles from normal, corresponding with a poor signal-to-noise ratio, had larger errors compared to calls recorded in the centre of the field of view. Locations in space could be estimated by combining angular measurements from two or more sensors. : Submitted to Bioacoustics (Taylor and Francis) 15 Nov. 2019 |
format |
Article in Journal/Newspaper |
author |
Wallis, David Elmeros, Morten |
author_facet |
Wallis, David Elmeros, Morten |
author_sort |
Wallis, David |
title |
Tracking European bat species with passive acoustic directional monitoring |
title_short |
Tracking European bat species with passive acoustic directional monitoring |
title_full |
Tracking European bat species with passive acoustic directional monitoring |
title_fullStr |
Tracking European bat species with passive acoustic directional monitoring |
title_full_unstemmed |
Tracking European bat species with passive acoustic directional monitoring |
title_sort |
tracking european bat species with passive acoustic directional monitoring |
publisher |
arXiv |
publishDate |
2020 |
url |
https://dx.doi.org/10.48550/arxiv.2001.07121 https://arxiv.org/abs/2001.07121 |
genre |
Nyctalus noctula Pipistrellus nathusii |
genre_facet |
Nyctalus noctula Pipistrellus nathusii |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.2001.07121 |
_version_ |
1766154757046534144 |