Device for transmitting data in a motor vehicle

The present invention relates to a device for data transmission in a motor vehicle and/or from a motor vehicle in its vicinity, including 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. 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.