Design of 3D Positioning Algorithm Based on RFID Receiver Array for In Vivo Micro-Robot
DASC '09 Proceedings of the 2009 Eighth IEEE International Conference on Dependable, Autonomic and Secure Computing
Design and Implementation of a High Resolution Localization System for In-Vivo Capsule Endoscopy
DASC '09 Proceedings of the 2009 Eighth IEEE International Conference on Dependable, Autonomic and Secure Computing
A novel radio propagation radiation model for location of the capsule in GI tract
ROBIO'09 Proceedings of the 2009 international conference on Robotics and biomimetics
BSN '10 Proceedings of the 2010 International Conference on Body Sensor Networks
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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.