Combined monopulse comparator and adaptive noise canceller for antennas
First Claim
1. A monopulse comparator system comprising,antenna means comprising feed means for providing two input signals which are each representative of a signal pattern relative to a receiving axis of said antenna means which is symmetrically offset with respect to the signal pattern associated with the other of said input signals,first and second signal channels connected in parallel, each coupled to receive one of said input signalsfirst comparator means coupled to both of said first and second signal channels to produce a difference signal which is a function of the difference between said input signals,first and second adaptive noise canceller means connected to receive said difference signal,first and second signal modifier means connected to said first and second adaptive noise canceller means, respectively, to selectively alter the status of the respective adaptive noise canceller,said first and second signal modifier means being coupled to supply modified signals which are modified by the respective adaptive noise canceller means, andsecond comparator means connected to receive signals from both of said first and second signal modifier means and to produce both a sum and a second difference signal which is a function of the sum and the difference between said modified signals.
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Abstract
This invention is directed to a modified monopulse comparator which includes two sum and difference hybrid junctions. The first hybrid junction produces a signal-free sample of any interference which is received by the datalink receiving antenna. The second hybrid junction is a standard monopulse comparator driven by amplified and filtered signals from the A and B antenna feeds after subtraction of the properly scaled and phased interference sample.
13 Citations
14 Claims
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1. A monopulse comparator system comprising,
antenna means comprising feed means for providing two input signals which are each representative of a signal pattern relative to a receiving axis of said antenna means which is symmetrically offset with respect to the signal pattern associated with the other of said input signals, first and second signal channels connected in parallel, each coupled to receive one of said input signals first comparator means coupled to both of said first and second signal channels to produce a difference signal which is a function of the difference between said input signals, first and second adaptive noise canceller means connected to receive said difference signal, first and second signal modifier means connected to said first and second adaptive noise canceller means, respectively, to selectively alter the status of the respective adaptive noise canceller, said first and second signal modifier means being coupled to supply modified signals which are modified by the respective adaptive noise canceller means, and second comparator means connected to receive signals from both of said first and second signal modifier means and to produce both a sum and a second difference signal which is a function of the sum and the difference between said modified signals.
Specification