| 摘要 |
The present invention discloses methods and an apparatus for characterizing an antenna system. The apparatus comprises a processor, a coupler, and a converter. The processor selectively injects a test signal into amplifiers in the antenna system while other amplifiers are amplifying the broadcast signal, and the amplified signals are then fed to a hybrid matrix. The coupler samples the combined amplified test and broadcast signals, and the converter converts the combined test and broadcast signals to a different frequency band to separate the test signal from the broadcast signal. The processor determines a phase response and an amplitude of the first amplifier and a phase effect of the hybrid matrix by measuring the separated test signal and modifies a phase of the broadcast signal using the determined phase response of the first amplifier and the hybrid matrix when the broadcast signal is subsequently provided to the first amplifier. The method comprises the steps of preventing a first amplifier from receiving a broadcast signal, injecting a test signal into the first amplifier, amplifying the broadcast signal by at least a second amplifier, combining the amplified test signal with the amplified broadcast signal, monitoring the combined amplified test signal, separating the combined amplified test signal to retrieve the amplified test signal, measuring the separated amplified test signal to determine a phase response of the first amplifier and a phase effect of the combining step, and modifying a phase of the broadcast signal using the determined phase response and the phase effect when the broadcast signal is subsequently provided to the first amplifier.
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