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A voyage to Africa by Mr Swift

Wahlström, Niklas ; Gustafsson, Fredrik LU and Åkesson, Susanne LU orcid (2012) 15th International Conference on Information Fusion, FUSION 2012 In 15th International Conference on Information Fusion, FUSION 2012 p.808-815
Abstract

A male common swift Apus apus was equipped with a light logger on August 5, 2010, and again captured in his nest 298 days later. The data stored in the light logger enables analysis of the fascinating travel it made in this time period. The state of the art algorithm for geolocation based on light loggers consists in computing first sunrise and sunset from the logged data, which are then converted to midday (gives longitude) and day length (gives latitude). This approach has singularities at the spring and fall equinoxes, and gives a bias for fast day transitions in the east-west direction. We derive a flexible particle filter solution, where sunset and sunrise are processed in separately measurement updates, and where the motion model... (More)

A male common swift Apus apus was equipped with a light logger on August 5, 2010, and again captured in his nest 298 days later. The data stored in the light logger enables analysis of the fascinating travel it made in this time period. The state of the art algorithm for geolocation based on light loggers consists in computing first sunrise and sunset from the logged data, which are then converted to midday (gives longitude) and day length (gives latitude). This approach has singularities at the spring and fall equinoxes, and gives a bias for fast day transitions in the east-west direction. We derive a flexible particle filter solution, where sunset and sunrise are processed in separately measurement updates, and where the motion model has two modes, one for migration and one for stationary long time visits, which are designed to fit the flying pattern of the swift. This approach circumvents the aforementioned problems with singularity and bias, and provides realistic confidence bounds on the geolocation as well as an estimate of the migration mode.

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Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
geolocation, light levels, nonlinear filtering, particle filter
host publication
15th International Conference on Information Fusion, FUSION 2012
series title
15th International Conference on Information Fusion, FUSION 2012
article number
6289885
pages
8 pages
conference name
15th International Conference on Information Fusion, FUSION 2012
conference location
Singapore, Singapore
conference dates
2012-09-07 - 2012-09-12
external identifiers
  • scopus:84867634961
ISBN
9780982443859
language
English
LU publication?
yes
id
39ddc4da-82fd-4624-a81a-af2ca1650e87
date added to LUP
2025-04-14 13:08:23
date last changed
2025-04-24 15:14:06
@inproceedings{39ddc4da-82fd-4624-a81a-af2ca1650e87,
  abstract     = {{<p>A male common swift Apus apus was equipped with a light logger on August 5, 2010, and again captured in his nest 298 days later. The data stored in the light logger enables analysis of the fascinating travel it made in this time period. The state of the art algorithm for geolocation based on light loggers consists in computing first sunrise and sunset from the logged data, which are then converted to midday (gives longitude) and day length (gives latitude). This approach has singularities at the spring and fall equinoxes, and gives a bias for fast day transitions in the east-west direction. We derive a flexible particle filter solution, where sunset and sunrise are processed in separately measurement updates, and where the motion model has two modes, one for migration and one for stationary long time visits, which are designed to fit the flying pattern of the swift. This approach circumvents the aforementioned problems with singularity and bias, and provides realistic confidence bounds on the geolocation as well as an estimate of the migration mode.</p>}},
  author       = {{Wahlström, Niklas and Gustafsson, Fredrik and Åkesson, Susanne}},
  booktitle    = {{15th International Conference on Information Fusion, FUSION 2012}},
  isbn         = {{9780982443859}},
  keywords     = {{geolocation; light levels; nonlinear filtering; particle filter}},
  language     = {{eng}},
  pages        = {{808--815}},
  series       = {{15th International Conference on Information Fusion, FUSION 2012}},
  title        = {{A voyage to Africa by Mr Swift}},
  year         = {{2012}},
}