Anti-theft protection system for a motor vehicle, and a method for operating an anti-theft protection system

US6809629B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Patric Heide · Vaterstetten, DE
• Johannes Ilg · Regensburg, DE
• Richard Roskosch · Ottobrunn, DE
• Klause Hofbeck · Dresden, DE
• Wolfgang Piesch · Regenstauf, DE
• Martin Vossiek · Ergolding, DE

Key dates

• Filing date: Nov 30, 2000
• Grant date: Oct 26, 2004
• Expiry date: Jan 7, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2209/63
• WIPO field: Control
• WIPO sector: Instruments

Abstract

Anti-theft protection system for a motor vehicle, and a method for operating an anti-theft protection system. The anti-theft protection system has a transmitting and receiving unit in the motor vehicle, which transmits radar signals and then waits for echo signals. A code transmitter, which receives a radar signal, modulates this signal and sends it back. An evaluation unit analyses all the received echo signals firstly for authorization of the code transmitter and secondly in order to determine the relative interior/exterior position of the code transmitter with respect to the motor vehicle.