Vehicle influence on the earth's magnetic field changes

Abstract

Anisotropic magneto-resistive sensors (hereinafter - AMR) react to the Earth's and vehicles' magnetic field, whereas variation disturbances of magnetic field allow detecting the vehicles in the parking space. Having known exactly how the magnetic field varies in the parking space and having measured it with sensor LSM303DLH AMR, an assumption can be made about the presence or absence of a vehicle in the parking space. The article covers analysis of a vehicle's influence on the Earth's magnetic field and possibilities to detect the vehicle. The car constructional model has been mathematically described. The experiment has been performed and compared with the theoretical considerations. Three static detection criteria of the vehicle have been formulated.