Mathematical modelling of single-bit passive RFID marker localization methods

This paper deals with two localization methods (i. e. presence detection) of single-bit inductively coupled RFID transponders (called markers) which are being used for point marking of underground facilities such as cables, pipelines etc. Two localization methods are analysed. The first method is based on detection of the damped oscillations periodically excited in resonant circuit of marker. The second method is based on the principle of grid dip oscillator (GDO) when the vicinity of marker resonant circuit influences on the current in the resonant circuit of localization device antenna. Both methods are mathematically analysed and they are compared in term of localization sensitivity which especially depends on distance between the coils of the marker and the localization device.