Research Article
Localization of an RF source inside the Human body for Wireless Capsule Endoscopy
@INPROCEEDINGS{10.4108/icst.bodynets.2013.253713, author={Rohit Chandra and Anders J Johansson and Fredrik Tufvesson}, title={Localization of an RF source inside the Human body for Wireless Capsule Endoscopy}, proceedings={8th International Conference on Body Area Networks}, publisher={ICST}, proceedings_a={BODYNETS}, year={2013}, month={10}, keywords={wireless capsule endoscopy rf localization phase difference least squares}, doi={10.4108/icst.bodynets.2013.253713} }- Rohit Chandra
Anders J Johansson
Fredrik Tufvesson
Year: 2013
Localization of an RF source inside the Human body for Wireless Capsule Endoscopy
BODYNETS
ACM
DOI: 10.4108/icst.bodynets.2013.253713
Abstract
This paper presents a method based on the phase difference of arrival and the non-linear least square estimation to localize a radio-frequency (RF) source, e.g a wireless capsule endoscope, inside the human body. The phase difference of arrival at multiple frequencies of a signal is used to estimate the distance of the source to a receiver. The linear least square estimation is used to estimate the initial position of the source followed by a non-linear least square method to improve the localization accuracy. The method is applied on noise free simulated data obtained from FDTD simulations in the 403.5 MHz MedRadio band of a simple homogeneous phantom and a more realistic heterogeneous phantom. The distance between the true position and the estimated position is found to be within 1 cm for the simulated cases showing the possibility to use the proposed method for localization of an RF source inside the human body, as long as the signal to noise ratio is high enough.
