With a redundant GPS antenna splitter two GPS antennas are connected
through an amplifier to a passive antenna splitter in parallel feeding
mode, whereby the direct current supply of the antennas is provided by a
DC driver stage, whose inputs (DC1 to DC8) are coupled with outputs of
the antenna splitter of the connected transmitters in order to control
the power supply with current measuring stages depending on the operating
condition of the GPS antennas and to deliver a supply voltage both to the
GPS antenna and HF-amplifier, if the antenna is active.