Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-09-18
1981-07-14
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
455278, H04B 700
Patent
active
042789788
ABSTRACT:
A method and apparatus for combining baseband signals from a large aperture antenna array in which none of the individual baseband signals has a sufficiently high signal-to-noise ratio to be used as a correlation or reference signal for phase adjusting the remaining baseband signals. More specifically, the invention provides a means whereby the baseband output signals of all but one of the receivers associated with each of the antennas are summed and used as a correlation reference for the baseband signal not contained in the summed signal, thereby providing a plurality of correlation or alignment loops, each having an output signal related to the phase difference between its input baseband signal and the summed signal. The invention further provides a means for subtracting an output or error signal generated in one of the correlation loops whose baseband signal has a predetermined phase delay from all the other alignment loops, thereby avoiding interaction and reflection effects in the signal combiner. A variable phase delay means for each of the other baseband signals is controlled by its corresponding correlation loop. The invention discloses how a plurality of loops operating in the above manner provides a means for adjusting the phase of each baseband signal so that they will all be in phase with each other and can thus be added to provide a composite signal output having a higher signal-to-noise ratio than any of the individual baseband signals.
REFERENCES:
patent: 4005426 (1977-01-01), Wite
Easterling Mahlon E.
Frosch Robert A. Administrator of the National Aeronautics and Space
Winkelstein Robin A.
Blum Theodore M.
Manning John R.
McCaul Paul F.
Mott Monte F.
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