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1.
Introduction
The DDA is an automotive roof top antenna module with integrated Bluetooth transceiver for
special usage. The Bluetooth circuit and electronics is designed to tunnel a not public described
data stream via Bluetooth generic protocol. The device rejects any communication requests from
Bluetooth devices not supporting the nonpublic payload format. The device is fully integrated to
the electronics of the car. The device will be integrated in the car only by the car-manufacturer or
in case of replacement by a professional garage. The end-user does not have to do any
installations or adjustments. There will be no aftermarket modules available since the device
needs to have a full range of ECUs available to communicate with.
The DDA is connected with the CAN-Bus of the car to communicate with the rest of the ECUs.
Additionally it has an antenna with integrated LNA circuits for reception of GNSS (GPS, GALILEO,
GLONASS, BEIDOU) and SDARS as well as an antenna for cell phone communication (2G, 3G and
4G) with frequency diplexer for 868 MHz ISM-Band. The availability of the separate ISM path is
given for versions without SDARS only. The Bluetooth transmitter is the only system with digital IO.
The other functions are analog circuits like in well known roof top car antennas.
2.
Installation Options
Example for a principle setup in a car.
The DDA is designed for in-car use only. It is designed according the detailed specification of the
OEM (car-manufacturer). It MUST be well integrated into the automotive environment (T
ambient
max. 95 °C) and needs to be installed by the OEM or in case of replacement by a professional
garage.
