Localization of an RF source inside the Human body for Wireless Capsule Endoscopy

Summary, in English

This paper presents a method based on the phase dierence

of arrival and the non-linear least square estimation to lo-

calize a radio-frequency (RF) source, e.g a wireless capsule

endoscope, inside the human body. The phase dierence 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 po-

sition is found to be within 1 cm for the simulated cases

showing the possibility to use the proposed method for lo-

calization of an RF source inside the human body, as long

as the signal to noise ratio is high enough.

• Author: Rohit Chandra; Anders J Johansson; Fredrik Tufvesson
• Department/s: Department of Electrical and Information Technology; ELLIIT: the Linköping-Lund initiative on IT and mobile communication
• Publishing year: 2013
• Language: English
• Pages: 48-54
• Full text: - 343 kB; Download statistics
• Links: http://dx.doi.org/10.4108/icst.bodynets.2013.253713
• Document type: Conference paper
• Topic: Electrical Engineering, Electronic Engineering, Information Engineering
• Conference name: 8th International Conference on Body Area Networks, BodyNets 2013
• Conference date: 2013-09-30 - 2013-10-02
• Status: Published
• Project: EIT_UPD Wireless Communication for Ultra Portable Devices
• Research group: Radio Systems