METHOD AND DEVICE FOR DETERMINING THE POSITION OF AT LEAST ONE SECOND TRANSMITTING AND RECEIVING DEVICE IN RESPECT OF A FIRST TRANSMITTING AND RECEIVING DEVICE IN A PASSIVE ACCESS CONTROL SYSTEM OPERATING IN THE GHZ RANGE

US6909396B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Mario Haselsteiner · Bad Kötzting, DE
• Klaus Hofbeck · Dresden, DE
• Thomas Klement · Regensburg, DE
• Birgit Rosel · Regensburg, DE
• Arnd Stielow · Regensburg, DE

Key dates

• Filing date: Oct 21, 2003
• Grant date: Jun 21, 2005
• Expiry date: Oct 21, 2023

Classification

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

Abstract

A method for determining the position of at least one second transmitting and receiving device (3) in respect of a first transmitting and receiving device in a passive access control system operating in the GHz range, comprising the steps of using a radar method, wherein signals (f1, f2) are received in the first transmitting and receiving device on the left-hand side and right-hand side of a modulation frequency (fmod), determining the distance of two signals (f1, f2) closest to the left-hand side and right-hand side modulation frequency (fmod) wherein the distance is proportional to the distance between the first transmitting and receiving device and at least one second transmitting and receiving device (3), so that multipath propagations are not taken into consideration.