Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-07-19
1985-12-03
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
H01Q 2106, H01Q 2124, H04B 710
Patent
active
045568880
ABSTRACT:
A system for processing two coherent RF signals respectively provided from two differently oriented receivers of RF radiation, to measure the polarization of the received radiation. A switch combines the two received signals in a repetitive time-shared sequence over a single channel. During each cycle one of the received signals is switched onto the channel for a first predetermined period and the other received signal subsequently is switched onto the channel for a longer second predetermined period that is an integer multiple of the first period. In order to determine the relative amplitude of the two received signals, the combined signal is delayed by one first predetermined period; and the delayed and undelayed combined signals are compared to thereby provide relative amplitude indication signals. In order to determine the relative phase of the two received signals, the combined signal is divided into two parts, and one part of the divided signals is delayed by one first predetermined period; the delayed and undelayed divided signals are processed by a polar discriminator to provide a combination of signals having amplitudes that are a function of the relative phase of the two received signals; and the combination of signals are encoded by a phase angle encoder to thereby provide a relative phase indication signal. The relative amplitude indication signals and the relative phase indication signal are processed by sampling the indication signals during intervals occurring at a rate of once per delay period and comparing the samples to provide an indication of the polarization of the received radiation.
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Blum Theodore M.
Cubic Corporation
Sotomayor John B.
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