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AssigneeRobert Bosch GmbH
InventorsFrank Gottwald, Klaus Voigtlaender, Slava Tihovsky, Stefan Gaier, Elmar Giehler, Peter Crowhurst
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A device for data transmission in a motor vehicle and/or from a motor vehicle in its vicinity has a first transceiver unit (1) in or on the motor vehicle and a second transceiver unit (2) which is provided in at least one transponder unit whose spatial position relative to the vehicle may be variable or any desired position; it is characterized in that the first transceiver unit (1) is a radar unit equipped for distance measurement, expanded by adding a two-channel data transmission system; the second transceiver unit (2) is also a two-channel data transmission unit, and the microwave frequencies (f1, f2) for two-channel communication of the data transmission system are selected so that their difference |f1-f2| yields an intermediate frequency (fIF) which is processable using conventional components in a heterodyne receiver in the reception part of each of the first and second transceiver units (1, 2).
A device for data transmission in a motor vehicle and/or from a motor vehicle in its vicinity, comprising a first transceiver unit (1) in or on the motor vehicle and a second transceiver unit (2) which is provided in at least one transponder unit whose spatial position relative to the vehicle may be arbitrary or variable,
The data transmission device according to one of the preceding claims, wherein the transponder unit is part of a vehicle key.
The data transmission device according to one of the preceding claims, wherein at least one transponder unit is also provided in an installation for acquisition of fees or for telematic applications or for remote control applications.
The data transmission device according to one of the preceding claims, wherein the transmitter and receiver of both transceiver units (1, 2) are set up so that their transmission frequency (f1, f2) is simultaneously used as the local oscillator frequency for a mixer (12, 22) which downmixes the receiving frequency in the reception case.
The data transmission device according to one of the preceding claims, wherein the transmission and receiving frequencies (f1, f2) of both transceiver units (1, 2) are selected so that their frequency shift conforms to the band limits of the frequency band used.
The data transmission device according to one of the preceding claims, wherein each microwave oscillator (10, 20) of both transceiver units (1, 2) has a dielectric resonant oscillator (DRO).
The data transmission device according to one of the preceding claims, wherein a frequency drift is corrected by an AFC circuit (27) in only one of the transceiver units, and thus the intermediate frequency (fIF) is kept constant.
The data transmission device according to one of the preceding claims, wherein a fluctuation in the intermediate frequency (fIF) caused by a frequency drift is compensated in only one of the transceiver units (1, 2);
The data transmission device according to one of the preceding claims, wherein a frequency shift keying modulator (FSK-M) is provided in the first and second transceiver units (1, 2).
Dependencies are inferred from the claim text.