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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ftuniaarhuspubl:oai:pure.atira.dk:publications/fefd909e-6877-4918-a940-d297a008d779 2023-05-15T17:59:45+02:00 Tracking European bat species with passive acoustic directional monitoring Wallis, David Elmeros, Morten 2021-07 https://pure.au.dk/portal/da/publications/tracking-european-bat-species-with-passive-acoustic-directional-monitoring(fefd909e-6877-4918-a940-d297a008d779).html https://doi.org/10.1080/09524622.2020.1801506 http://arxiv.org/pdf/2001.07121 eng eng info:eu-repo/semantics/restrictedAccess Wallis , D & Elmeros , M 2021 , ' Tracking European bat species with passive acoustic directional monitoring ' , Bioacoustics - the International Journal of Animal Sound and its Recording , vol. 30 , no. 4 , pp. 418-436 . https://doi.org/10.1080/09524622.2020.1801506 Acoustic interferometry bats localisation direction finding ALTIMETER ROADS article 2021 ftuniaarhuspubl https://doi.org/10.1080/09524622.2020.1801506 2022-08-31T22:52:35Z 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 an indication of 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 at a site in Denmark (Pipistrellus nathusii, Pipistrellus pygmaeus, Eptesicus serotinus, Myotis daubentoniiandNyctalus 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 sensor sensitivity, 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. Article in Journal/Newspaper Pipistrellus nathusii Aarhus University: Research Bioacoustics 30 4 418 436 |
institution |
Open Polar |
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Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Acoustic interferometry bats localisation direction finding ALTIMETER ROADS |
spellingShingle |
Acoustic interferometry bats localisation direction finding ALTIMETER ROADS Wallis, David Elmeros, Morten Tracking European bat species with passive acoustic directional monitoring |
topic_facet |
Acoustic interferometry bats localisation direction finding ALTIMETER ROADS |
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 an indication of 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 at a site in Denmark (Pipistrellus nathusii, Pipistrellus pygmaeus, Eptesicus serotinus, Myotis daubentoniiandNyctalus 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 sensor sensitivity, 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. |
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 |
publishDate |
2021 |
url |
https://pure.au.dk/portal/da/publications/tracking-european-bat-species-with-passive-acoustic-directional-monitoring(fefd909e-6877-4918-a940-d297a008d779).html https://doi.org/10.1080/09524622.2020.1801506 http://arxiv.org/pdf/2001.07121 |
genre |
Pipistrellus nathusii |
genre_facet |
Pipistrellus nathusii |
op_source |
Wallis , D & Elmeros , M 2021 , ' Tracking European bat species with passive acoustic directional monitoring ' , Bioacoustics - the International Journal of Animal Sound and its Recording , vol. 30 , no. 4 , pp. 418-436 . https://doi.org/10.1080/09524622.2020.1801506 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1080/09524622.2020.1801506 |
container_title |
Bioacoustics |
container_volume |
30 |
container_issue |
4 |
container_start_page |
418 |
op_container_end_page |
436 |
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1766168631624859648 |