Antitheft protection system, method for operating an antitheft protection system and components of an antifheft protection system

• US 20030095031A1
• Filed: 10/16/2002
• Published: 05/22/2003
• Est. Priority Date: 10/16/2001
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Stielow, Arnd, Hofbeck, Klaus, Rosel, Birgit, Haselsteiner, Mario
• Granted Patent: US 7,061,397 B2
• Time in Patent Office: Days
• US Class Current: 340/5.61
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user

Abstract

An antitheft protection system for a vehicle (10) comprises at least one transmitting and receiving unit (12) connected to the vehicle (10), at least one code transmitter (18), which can communicate with the at least one transmitting and receiving unit (12), and at least one base unit (14), which can communicate with the at least one transmitting and receiving unit (12).

It is provided that the communication between the at least one transmitting and receiving unit (12) and the at least one base unit (14) is effected in a wireless manner, and that, on the basis of the signals communicated during the communication between the at least one transmitting and receiving unit (12) and the at least one base unit (14), in the at least one base unit (14), it is possible to determine a quantity as a measure of the distance between the at least one transmitting and receiving unit (12) and the at least one base unit (14), in the at least one base unit (14).

Claims

1. An antitheft protection system for a vehicle comprising:

at least one transmitting and receiving unit connected to the vehicle,

at least one code transmitter, which can communicate with the at least one transmitting and receiving unit, and

at least one base unit, which can communicate with the at least one transmitting and receiving unit, wherein

the communication between the at least one transmitting and receiving unit and the at least one base unit is effected in a wireless manner, and wherein

on the basis of the signals communicated during the communication between the at least one transmitting and receiving unit and the at least one base unit, in the at least one base unit, it is possible to determine a quantity as a measure of the distance between the at least one transmitting and receiving unit and the at least one base unit, in the at least one base unit.

2. The antitheft protection system as claimed in claim 1, wherein the at least one transmitting and receiving unit can forward signals with a defined or with no phase offset.

3. The antitheft protection system as claimed in claim 1, wherein a plurality of transmitting and receiving units are provided, which communicate with the same base unit.

4. The antitheft protection system as claimed in claim 1, wherein the communication between the at least one transmitting and receiving unit and the at least one base unit is effected with the participation of at least one directional antenna.

5. The antitheft protection system as claimed in claim 1, wherein the at least one transmitting and receiving unit operates as a bidirectional amplifier.

6. The antitheft protection system as claimed in claim 1, wherein

means for evaluating received signals are provided in the base unit, and

the evaluation means determine a quantity which is a measure of the distance between vehicle and code transmitter.

7. The antitheft protection system as claimed in claim 1, wherein the base unit is connected to a data bus.

8. The antitheft protection system as claimed in claim 1, wherein the system operates in the GHz range.

9. A method for operating an antitheft protection system for a vehicle, wherein:

at least one transmitting and receiving unit connected to the vehicle communicates with at least one code transmitter, and

at least one base unit communicates with the at least one transmitting and receiving unit, characterized

the communication between the at least one transmitting and receiving unit and the at least one base unit is effected in a wireless manner, and

on the basis of the signals communicated during the communication between the at least one transmitting and receiving unit and the at least one base unit, in the at least one base unit, a quantity is determined as a measure of the distance between the at least one transmitting and receiving unit and the at least one base unit, in the at least one base unit.

10. The method as claimed in claim 9, wherein the at least one transmitting and receiving unit forwards signals with a defined or with no phase offset.

11. The method as claimed in claim 9, wherein a plurality of transmitting and receiving units are provided, which communicate with the same base unit.

12. The method as claimed in claim 9, wherein the communication between the at least one transmitting and receiving unit and the at least one base unit is effected with the participation of at least one directional antenna.

13. The method as claimed in claim 9, wherein the at least one transmitting and receiving unit operates as a bidirectional amplifier.

14. The method as claimed in claim 9, wherein

signals received in the base unit are evaluated, and

a quantity is determined which is a measure of the distance between vehicle and code transmitter.

15. The method as claimed in claim 9, wherein the base unit is connected to a data bus.

16. The method as claimed in claim 9, wherein the system operates in the GHz range.