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Vol. 118, Issue 7, July 2010, pp.136-143




Towards Improving the Geolocation Estimates Using Light Tags


Prajas JOHN, Adrine Antony CORREYA, Jaison PETER, Supriya M. H. and P. R. Saseendran PILLAI

Department of Electronics, Cochin University of Science and Technology,

Cochin-22, India

Tel.: +919495080856, fax: +914842575800,

E-mail: prajas@gmail.com



Received: 2 March 2010   /Accepted: 24 July 2010   /Published: 31 July 2010


Abstract: Gathering the positional information of highly migratory marine species like tuna, shark and certain classes of whales in the open ocean using light intensity measurements is a promising technique. Light intensity measurements are carried out using an archival light tag, comprising of a digital high resolution light sensor and a microcontroller. The accurate estimation of the times of sunrise and sunset events are very important for the precise estimation of the geolocation. The proposed tag can measure the light intensity more accurately up to 0.015 lux. The day light intensity variation furnished by the light tag in conjunction with astronomical equations can provide positional information of the species. The accuracy of the geolocation estimates is improved by judiciously selecting the appropriate thresholds for the dawn and dusk, depending on the overall percentage of light intensity variations.


Keywords: Light tag, Astronomical algorithms, Threshold level, Geolocation


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