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

A diversity reception system for receiving digitally modulated terrestrial and/or satellite signals in the HF frequency range above 1 GHz for motor vehicles, having an antenna arrangement whose reception signal (5) is supplied to a radio receiver (3), comprising;

• the antenna arrangement (20) having an antenna system (1) with a plurality of individual antennas (A1, A2, A3, etc.), and a plurality of antenna components (4a, 4b, 4c, etc.);
• a controllable logic switching device (2) having a plurality of discrete switching positions (S1, S2, S3, etc.), and coupled to said individual antennas (A1, A2, A3, etc.) and said antenna components (4a, 4b, 4c, etc.), wherein said individual antennas (A1, A2, A3, etc.) and said plurality of antenna components (4a, 4b, 4c, etc.) are designed and positioned on the vehicle so that at the output (21) of said controllable logic switching device (2) there are provided reception signals (5), that are different in terms of diversity for the discretely available switching positions (S1, S2, S3, etc.) of the controllable logic switching device (2);
• a reception level testing device (25) having its input coupled to the receiver (3), for comparatively determining the reception levels of the flow of data contained in the HF channel with the HF channel bandwidth B, wherein said testing device (25) is designed so that when its input is initiated by the symbol cycle (18) generated in the receiver (3) and during the simultaneously occurring symbol identification of the data flow received, the reception level is determined in each case within the shortest possible level testing duration Tp (11), wherein Tp≈1B;
• a level comparator (10) coupled to said testing device (25) wherein the received data flow is successively tested by multiple successive comparative level tests in said level comparator (10) with the help of correspondingly generated reversing signals (23) produced at the output of said testing device and successively supplied to said logic switching device (2), and wherein a favorable reception signal (5) is thereafter selected upon passing through a test cycle, and the test cycle is repeatedly initiated by the reception level testing device (25) with short test cycle time spacings Tz, so that within a traveled distance of approximately one half of a wavelength of the high-frequency carrier, the level of the reception signal (5) is adjusted and updated a plurality of times.