Technique for cancelling antenna sidelobes
First Claim
1. An antenna sidelobe cancellation arrangement comprising:
- a first input for receiving a sum pattern signal from an antenna monopulse feed;
a second input for receiving a difference pattern signal from the antenna monopulse feed;
a third input for receiving a flat pattern signal from a standard gain omnidirectional antenna feed; and
a cancellation network comprising;
a first canceller section coupled to the second and third inputs for appropriately shifting the difference pattern signal from the second input by a predetermined amount with the flat pattern signal from the third input to generate an output signal wherein the lobes of the shifted difference pattern signal correspond to the lobes of the sum pattern signal at the first input; and
a second canceller section responsive to the output signal from the first canceller section and the sum signal at the first input for introducing appropriate portion of the shifted difference pattern signal into the sum pattern signal for substantially cancelling interference in the sum pattern signal at an output of the cancellation arrangement.
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Accused Products
Abstract
The present invention relates to an antenna sidelobe or interference cancellation arrangement including an antenna with a monopulse feed, for providing a sum and difference pattern signal, and an omnidirectional feed for providing a flat pattern signal. The flat pattern signal is used to appropriately shift the lobes of the received difference pattern signal in a first canceller section to substantially correspond to the location of the lobes of the received sum pattern signal. The shifted difference pattern signal is then used to cancel interference in the sum pattern signal in a second canceller section to generate an output signal at the cancellation arrangement which is relatively interference free over a wide band of frequencies.
22 Citations
5 Claims
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1. An antenna sidelobe cancellation arrangement comprising:
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a first input for receiving a sum pattern signal from an antenna monopulse feed; a second input for receiving a difference pattern signal from the antenna monopulse feed; a third input for receiving a flat pattern signal from a standard gain omnidirectional antenna feed; and a cancellation network comprising; a first canceller section coupled to the second and third inputs for appropriately shifting the difference pattern signal from the second input by a predetermined amount with the flat pattern signal from the third input to generate an output signal wherein the lobes of the shifted difference pattern signal correspond to the lobes of the sum pattern signal at the first input; and a second canceller section responsive to the output signal from the first canceller section and the sum signal at the first input for introducing appropriate portion of the shifted difference pattern signal into the sum pattern signal for substantially cancelling interference in the sum pattern signal at an output of the cancellation arrangement. - View Dependent Claims (2, 3, 4, 5)
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Specification