Mobile device, base structure, system and method for recovery of 3D parameters of low frequency magnetic field vectors

US10325431B2 · kind B2 · utility

Assignee

• NXP B.V. · NL

Inventors

• Wolfgang Eber · Zeltweg, AT
• Bernhard Spiess · Gratwein-Straßengel, AT
• Marcin Tomasz Bawolski · Graz, AT
• Matja{hacek over (z)} Gu{hacek over (s)}tin · Graz, AT

Key dates

• Filing date: Sep 13, 2018
• Grant date: Jun 18, 2019
• Expiry date: Sep 13, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2009/00769
• WIPO field: Control
• WIPO sector: Instruments

Abstract

Disclosed are: a mobile device, in particular a mobile Passive Keyless Entry, PKE, key device, and an associated method for providing 3D field values of a magnetic field H; an evaluation device for use in a PKE system having a Mobile device and an associated method for determining the direction of a magnetic field vector H=(x, y, z), which is present locally at a position of a 3D antenna of the mobile device; and a PKE system having a PKE base structure, to which preferably the mobile device is associated and which has at least a first base structure antenna, which is operable to emit the, particularly low frequency, magnetic field, the mobile PKE device and the evaluation unit. The mobile device and the associated method are characterized by providing, in addition to providing a first, second and third value vx, vx, and vx indicative of the local X-component x, Y-component y, and Z-component x of the magnetic field vector H, a sum value vS indicative of the sum |S|=|x+y+z| of the local X-, Y-, and Z-components of the magnetic field vector H. The evaluation device and the associated method are characterized by providing the vector V yielded as a vector, which has the direction of t…