Diversity system for receiving digital terrestrial and/or satellite radio signals for motor vehicles

摘要

The invention relates to a diversity reception system for motor vehicles for digitally modulated terrestrial and/or satellite radio signals in the frequency range above 1 GHz. The system includes an antenna arrangement of which the reception signal is supplied to a radio receiver. The antenna arrangement is designed as an antenna system having several individual antennas and several antenna components, and contains a controllable logic switching device. The individual antennas and the several antenna components are positioned on the vehicle so that for discrete switching positions of the controllable logic switch, reception signals that are different in terms of diversity are available at the antenna connection point. A reception level testing device is provided for the comparative determination of the reception level contained in the data flow in the HF-channel with an HF channel bandwidth B. The level testing device is designed so that when initiated by the symbol cycle generated in the receiver and during the simultaneously occurring symbol identification of the received flow of data, the reception level is determined in each case within the shortest possible level testing duration.