Application of the Fresnel zone and Free-space Path for image reconstruction in radio tomography

The article presents a measurement solution and image reconstruction algorithms using radio-frequency tomography. In this method, the action requires measuring the strength of the radio signal between the transmitter and the receiver. The under pressure of the measurement value of the signal strength changes as a result of the absorption, reflection or dissipation of electromagnetic waves. Radio tomography can determine the position of a man in closed rooms. It can be used for navigation and locating inside buildings. The solution works on the basis of Bluetooth 4.0 Low Energy signals and devices emitting radio signals.