Patent ID: 6667612
Filing Date: 2003-12-23
Classification: G01B,G01D,H04B

Abstract:
Positioning system for a mobile object with respect to a fixed reference system, characterized by the fact that:the mobile object is equipped with a probe (1) comprising at least one resonant circuit (L1C1) enabling reception of a magnetic field with frequency fg and transmission of a magnetic field at frequency fe; and, the reference system (2) is provided with: means of transmission/reception (3; 5) of a magnetic field comprising a voltage generator (G) generating a signal with frequency fg powering at least one electromagnetic coil (L3; L5) and at least one capacitor (C3; C5) forming a series resonant circuit, with the said coil; anti-dazzle means by which the transmission/reception means can distinguish the magnetic field with frequency fe from the magnetic field with frequency fg; and detection and comparison (4) means to detect the amplitude of the voltage induced at the terminals of the resonant transmission/reception means and to deduce the displacement of the probe with respect to the reference system.