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Proceedings Paper

A mathematical model for localization and tracking of telemetry capsules using RSSI signals
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Paper Abstract

In this paper we consider the problem of tracking the real-time positions of a diagnostic capsule in the gastrointestinal (GI) tract. Our solution is a fully developed estimation algorithm that utilizes radio frequency signals converted to voltage on the received signal strength indicator (RSSI) output of an array of transceivers. We employed a modified form of the traditional radio-map based deterministic model that requires an estimate of initial position vector. Data capture was implemented with commercial off-the-shelf transceivers featuring RSSI outputs. At the intermediate processing stages, trilateration was employed as a mathematical tool to determine the approximate 2-D coordinates of unknown capsule locations by linearizing the resulting equations. This approach facilitates a PC-based implementation of fully automated real-time position measurements by eliminating the need to measure angles. In the final algorithm based on non linear least squares approximations, the Newton's iteration of the resulting Jacobian matrices were used to generate a more accurate position coordinates. Test Results from laboratory experiments demonstrate the accuracy of the solution in the centimeter range. This results in a position tracking measurements with an average value error of less than 25%. This kind of results guarantees that our solution can be adapted into telemetry capsules for use in diagnosing intestinal malfunctions.

Paper Details

Date Published: 22 May 2007
PDF: 9 pages
Proc. SPIE 6592, Bioengineered and Bioinspired Systems III, 65920B (22 May 2007); doi: 10.1117/12.721299
Show Author Affiliations
Khalil Arshak, Univ. of Limerick (Ireland)
Francis Adepoju, Univ. of Limerick (Ireland)

Published in SPIE Proceedings Vol. 6592:
Bioengineered and Bioinspired Systems III
Paolo Arena; Ángel Rodríguez-Vázquez; Gustavo Liñán-Cembrano, Editor(s)

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