Device for transmitting data in a motor vehicle

• US 6,693,581 B2
• Filed: 12/13/2002
• Issued: 02/17/2004
• Est. Priority Date: 02/09/2000
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Giehler, Elmar, Crowhurst, Peter, Tihovsky, Slava, Gaier, Stefan, Gottwald, Frank, Voigtlaender, Klaus
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US10/203,528
• Publication Number:
  US 20030142004A1
• Time in Patent Office: 431 Days
• Field of Search: 342/42-51, 342/59, 342/60, 342/61, 342/70, 342/71, 342/72, 342/89-103, 342/175, 342/195, 342/27, 342/28, 342/118-146
• US Class Current: 342/70
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: G01S 13/767 Responders; Transponders teaching or practice apparatus for gun-aiming or gun-laying using reflecting targets or active targets F41G3/26
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 2013/9329 cooperating with reflectors or transponders
• CPC Class Codes: G01S 7/006 using shared front-end circuitry, e.g. antennas G01S13/765, G01S13/825 take precedence
• CPC Class Codes: G01S 7/024 using polarisation effects in waveguides H01P1/165; for aerials H01Q, e.g. H01Q15/22, H01Q15/24, H01Q19/195
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 2209/61 Signal comprising different frequencies, e.g. frequency hopping
• CPC Class Codes: G07C 2209/63 Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks
• CPC Class Codes: H01Q 1/3208 characterised by the application wherein the antenna is used

Abstract

A device for data transmission in a motor vehicle and/or from a motor vehicle in its vicinity includes a first transceiver unit in or on the motor vehicle and a second transceiver unit. which is provided in at least one transponder unit whose spatial position relative to the vehicle may be variable or any desired position. In the first transceiver unit is a radar unit equipped for distance measurement, expanded by adding a two-channel data transmission system. The second transceiver unit is also a two-channel data transmission unit, and the microwave frequencies for two-channel communication of the data transmission system are selected so that their difference yields an intermediate frequency which is processable using conventional components in a heterodyne receiver in the reception part of each of the first and second transceiver units.

Claims

1. A device for data transmission for at least one of in a first motor vehicle and from a second motor vehicle, comprising:

a first transceiver unit located with the first motor vehicle, and being radar unit equipped for distance measurement that is expanded by adding a two-channel data transmission system;

at least one transponder unit; and

a second transceiver unit in the at least one transponder unit and being spatially positioned relative to the first motor vehicle one of arbitrarily and variably, the second transceiver unit being a two-channel data transmission unit;

wherein microwave frequencies for two-channel communication are selected so that their difference yields an intermediate frequency that is processable in a heterodyne receiver in a reception part of each of the first transceiver unit and the second transceiver unit.

2. The data transmission device of claim 1, further comprising:

at least one antenna for at least one of transmitting and receiving, being circularly polarized on a side of one of the first transceiver unit and the second transceiver unit, and being linearly polarized on a side of another one of the first transceiver unit and second transceiver unit.

3. The data transmission device of claim 2, wherein the at least one antenna is circularly polarized on a transponder side.

4. The data transmission device of claim 2, wherein the at least one antenna includes a spherical directional characteristic on a transponder side.

5. The data transmission device of claim 1, wherein the transponder unit is part of a vehicle key.

6. The data transmission device of claim 5, wherein the vehicle key is configured for keyless access to the first motor vehicle based on an identification signal transmitted by data transmission between the first motor vehicle and the at least one transponder unit.

7. The data transmission of claim 1, further comprising:

a second transponder unit for one of telematic applications, acquiring fees, and remote control applications.

8. The data transmission device of claim 1, wherein the first transceiver unit and the second transceiver unit each include a transmitter and a receiver configured so that their transmission frequency is simultaneously used as a local oscillator frequency for a mixer that downmixes a receiving frequency in a reception case.

9. The data transmission device of claim 1, wherein a transmission frequency and a receiving frequency of both the first transceiver unit and the second transceiver unit are selected so that their frequency shift conforms to band limits of a used frequency band.

10. The data transmission device of claim 1, wherein the first transceiver unit and the second transceiver unit each include a microwave oscillator that includes a dielectric resonant oscillator.

11. The data transmission device of claim 1, wherein the first transceiver unit and the second transceiver unit each include a microwave oscillator that includes a voltage-controlled oscillator.

12. The data transmission device of claim 1, wherein a frequency drift is correctable by an AFC circuit in only one of the first transceiver unit and the second transceiver unit to maintain a constant intermediate frequency.

13. The data transmission device of claim 12, wherein the AFC circuit is provided only in the second transceiver unit.

14. The data transmission device of claim 1, wherein a fluctuation in an intermediate frequency caused by a frequency drift is compensated in only one of the first transceiver unit and the second transceiver unit, and the intermediate frequency is downmixed with a variable local oscillator signal to a lower constant intermediate frequency.

15. The data transmission device of claim 14, wherein a circuit for generating the variable local oscillator signal is provided only in the second transceiver unit.

16. The data transmission device of claim 1, wherein at least one of the first transceiver unit and the second transceiver unit includes a transmitting antenna and a separate receiving antenna.

17. The data transmission device of claim 1, wherein at least one of the first transceiver unit and the second transceiver unit includes a common antenna and a directional coupler for a transmitting/receiving branch.

18. The data transmission device of claim 1, wherein each of the first transceiver unit and the second transceiver unit include a frequency shift keying modulator.

19. The data transmission device of claim 1, wherein each of the first transceiver unit and the second transceiver unit include an amplitude shift keying modulator.

20. The data transmission device of claim 1, wherein each of the first transceiver unit and the second transceiver unit include a phase shift keying modulator.