Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1985-02-13
1987-09-29
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
342384, 342358, G01S 316, H04R 7185
Patent
active
046971882
ABSTRACT:
Undesired signals from interfering satellites are separated from desired signals from a target satellite by using a sum beam and a difference beam as in a monopulse radar. Both desired and undesired signals are received by an antenna and separated by different mode couplers from a waveguide. The fundamental mode of the waveguide provides the desired signals along with components from the interfering signals. Both desired and undesired signals are picked up from the waveguide through a fundamental mode coupler. The higher order modes of the waveguide provide the interfering signals alone, representing the difference beam which will be aligned along the boresight. In a circular waveguide, the TM.sub.01.sup.o will yield a difference pattern for vertical polarization in any plane, and a TE.sub.21.sup.o or TE.sub.01.sup.o mode will result in a difference pattern for horizontal polarization. A square or a rectangular waveguide could be used instead of a circular waveguide to achieve the same result. The higher order mode signals are processed through a delay line and weighting circuit, also known as the least mean square loop, and then summed with the fundamental mode signals to derive the desired signals substantially free from undesired, interfering signals.
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American Telephone and Telegraph Company AT&T Bell Laboratories
Blum Theodore M.
Cain D.
Nimtz Robert O.
Roberts Patrick E.
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