US3761923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar side lobe canceller input equalizer
Assignee: United States Department of the Army
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Filing: 1972-09-01
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Granted: 1973-09-25
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Expires: 1992-09-01
Abstract
Abstract The radar side lobe canceller input equalizer provides interfaces at both inputs and outputs of the main and auxiliary receiver headends. These interfaces are time-division multiplexed so that each channel is alternately used to consecutively transmit simultaneous time increments of the two signals. The signals are restored to their original channel prior to coupling into the side lobe canceller. The amplitude versus frequency characteristics of these output signal portions are no longer dependent on the individual characteristic of each head-end, but on a matched combination of both.
Inventors
- 👤 J Downie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:45
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/2813
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
In combination with a radar receiving system having primary and auxiliary receiving antennas coupled to a radar side lobe canceller, the improvement which comprises a radar side lobe canceller input equalizer coupled between respective antennas and said side lobe canceller for reducing the effects of undesireable energy incident to antenna side lobes; said equalizer having primary and auxiliary signal channels connected to respective system antennas, and gating means in common with said channels for time-division multiplexing auxiliary channel signals with said primary channel signals.
Claim 2
Dependent Claim
84 words
In combination with a radar receiving system having primary and auxiliary receiving antennas coupled to a radar side lobe canceller, the improvement which comprises a radar side lobe canceller input equalizer coupled between respective antennas and said side lobe canceller for reducing the effects of undesireable energy incident to antenna side lobes; said equalizer having primary and auxiliary signal channels connected to respective system antennas, and gating means in common with said channels for time-division multiplexing auxiliary channel signals with said primary channel signals.
Claim 3
Dependent Claim
96 words
The radar side lobe canceller input equalizer as set forth in claim 1 wherein each of said channels comprises: an antenna input, a first gate for time-multiplexing signals applied thereto, said gate being coupled to said antenna input; a parametric amplifier having an input connected to an output of said first gate, a second gate for time-multiplexing signals coupled thereto, a delay line connected between said parametric amplifier and said second gate for coupling signals to said gate, and an output connected to said second gate for coupling said gate to the radar side lobe canceller.
Claim 4
Dependent Claim
52 words
The side lobe canceller input equalizer as set forth in claim 2 and further comprising first delay means connected between said primary channel input and the first gate of said auxiliary channel, and second delay means connected between the input of said auxiliary channel and the first gate of said primary channel.
Claim 5
Dependent Claim
60 words
The side lobe canceller as set forth in claim 3 wherein said first and second delay means are waveguide for delaying microwave frequencies, and said channel delay lines are coaxial cable for delaying intermediate frequencies; and further comprising direct coupling from the outputs of said primary and auxiliary parametric amplifiers to respective second gates of said auxiliary and primary channels.
References Cited (Backward Citations)
US3202990A
Cited
US3177489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |