Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-12-21
1981-10-13
Buczinski, S. C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
455 60, 455137, 455139, H04B 700
Patent
active
042951402
ABSTRACT:
A method and apparatus for measuring Faraday rotation of a received rf signal. The disclosure describes a specific implementation of a simultaneous orthogonal polarization receiver which compensates for a 3 db loss due to splitting of a received signal into left circular and right circular polarization channels. The compensation is achieved by rf and modulation arraying utilizing a specific receiver array which also detects and measures Faraday rotation in the presence or absence of spin stabilization effects on a linear polarization vector. Either up-link or down-link measurement of Faraday rotation is possible utilizing the method and apparatus disclosed herein. Specifically, the Faraday measurement apparatus utilized in conjunction with the specific receiver array provides a means for comparing the phase of a reference signal in the receiver array to the phase of a tracking loop signal related to the incoming signal, and comparing the phase of the reference signal to the phase of the tracking signal shifted in phase by 90 degrees. One of the comparison signals is averaged so that its output represents an average phase change of the received signal, whereas the other comparison signal is not averaged, this signal thus being related to the instantaneous phase change which includes a component due to spin stabilization of the spacecraft and a component due to Faraday rotation as the transmitted signal passes through a medium prior to arriving at the receiver. These two signals, i.e., the averaged and unaveraged signals, are compared, the phase changes between the two signals being related to Faraday rotation.
REFERENCES:
patent: 3646448 (1972-02-01), Harmon, Jr. et al.
patent: 4112370 (1978-09-01), Monsen
patent: 4186347 (1980-01-01), Frosch et al.
patent: 4220923 (1980-09-01), Pelchat et al.
Brockman Milton H.
Frosch Robert A. Administrator of the National Aeronautics and Space
Buczinski S. C.
Manning John R.
McCaul Paul F.
Mott Monte F.
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