Radar system and method of operating such system
First Claim
1. A method of operating a monopulse receiver comprising the steps of:
- (a) forming an elevation difference signal, p, and an azimuth difference signal, y;
(b) forming, during a first interval of time, a first composite signal comprising the elevation difference signal phase multiplexed with the azimuth difference signal and providing said first composite signal to an output terminal;
(c) forming, during a second interval of time following the first interval of time, a second composite signal comprising the elevation difference signal phase multiplexed with the azimuth difference signal delayed in phase by one hundred and eighty degrees and providing said second composite signal to the output terminal; and
(d) repeating steps (a), (b) and (c) during successively occurring intervals to provide a composite difference signal.
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Accused Products
Abstract
A monopulse receiver includes a monopulse antenna and arithmetic unit for providing a monopulse sum signal, S, an azimuth difference signal, y, and an elevation difference signal, p, an imbalance correction circuit to provide a first composite signal defined as (y+jp) and a second composite signal defined as (y-jp), wherein j is an indicator of being in quadrature with the monopulse sum signal, and for interleaving the first and the second composite signal for providing a composite difference signal, D, and a combiner for providing a third composite signal defined as [S+D] and a fourth composite signal defined as [S-D]. The monopulse receiver further includes a switch matrix, for feeding the third composite signal to a first amplifier channel and for simutaneously feeding the fourth composite signal to a second amplifier channel during a first interval of time and, alternatively, for feeding the third composite signal to the second amplifier channel and for simutaneously feeding the fourth composite signal to the first amplifier channel during a second interval of time to provide an output signal from each of the first and second amplifier channels, and a second switch matrix fed by each output signal from the first and second amplifier channels, to provide successively amplified third composite signals [S+D] at a first output line and successively amplified fourth composite signals [S-D] at a second output line. With this arrangement, the effects of phase and amplitude imbalances in the monopulse antenna and arithmetic circuitry are reduced.
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Citations
14 Claims
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1. A method of operating a monopulse receiver comprising the steps of:
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(a) forming an elevation difference signal, p, and an azimuth difference signal, y; (b) forming, during a first interval of time, a first composite signal comprising the elevation difference signal phase multiplexed with the azimuth difference signal and providing said first composite signal to an output terminal; (c) forming, during a second interval of time following the first interval of time, a second composite signal comprising the elevation difference signal phase multiplexed with the azimuth difference signal delayed in phase by one hundred and eighty degrees and providing said second composite signal to the output terminal; and (d) repeating steps (a), (b) and (c) during successively occurring intervals to provide a composite difference signal. - View Dependent Claims (2)
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3. A method of operating a monopulse receiver comprising the steps of:
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(a) forming an elevation difference signal, p, and an azimuth difference signal, y; (b) forming, during a first interval of time, a first composite signal defined as (p+jy) wherein j is an indicator of being in quadrature with the elevation difference signal and providing said first composite signal to an output terminal; (c) forming, during a second interval of time following the first interval of time, a second composite signal defined as (p-jy) and providing said second composite signal to the output terminal; and (d) repeating steps (a), (b) and (c) during successively occurring intervals to provide a composite difference signal. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A monopulse receiver comprising:
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(a) means for providing an elevation difference signal, p, and an azimuth difference signal, y; (b) means, fed by the elevation difference signal and the azimuth difference signal, for providing a first composite signal defined as (p+jy), and for providing a second composite signal defined as (p-jy), wherein j is an indication of being in quadrature with the elevation difference signal, and for interleaving the first and the second composite signal for providing a composite difference signal. - View Dependent Claims (11, 12)
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13. A monopulse receiver comprising:
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(a) means for providing a monopulse sum signal, S, an azimuth signal, y, and an elevation signal, p; (b) means, fed by the azimuth difference signal and the elevation difference signal, for providing a first composite signal defined as (y+jp) and a second composite signal defined as (y-jp}, wherein j is an indicator of being in quadrature with the monopulse sum signal, and for interleaving the first and the second composite signal for providing a composite difference signal, D; (c) means, fed by the monopulse sum signal and the composite difference signal, for providing a third composite signal defined as [S+D] and a fourth composite signal defined as [S-D]; (d) means, responsive to a first control signal, for feeding the third composite signal to a first amplifier channel and for simultaneously feeding the fourth composite signal to a second amplifier channel during a first interval of time and, alternatively, for feeding the third composite signal to the second amplifier channel and for simultaneously feeding the fourth composite signal to the first amplifier channel during a second interval following the first interval of time, for providing an output signal from each of the first and second amplifier channels; and (e) means, responsive to a second control signal and fed by each output signal from the first and second amplifier channels, for providing successively amplified third composite signals [S+D] at a first output line and successively amplified fourth composite signals [S-D] at a second output line. - View Dependent Claims (14)
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Specification