Patent US3810177A successfully refreshed from Google Patents.
US3810177A
Expired / Lapsed
US
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Monopulse radar receiver
Assignee: Thales SA
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Filing: 1972-09-29
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Granted: 1974-05-07
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Expires: 1992-09-29
Abstract
Abstract The present invention relates to the receivers used in multibeam, recurrent pulse ranging systems. In accordance with the invention, in a receiver comprising two variable-gain amplifiers, one of which is for the sum signal Sigma and the other for the difference signal Delta , it is arranged that with one recurrence among a plurality thereof, the sum signal is supplied to the difference amplifier and the gain control device AGC is then supplied with the sum signal from the output of that amplifier. The synchronous demodulator D supplies the signal K . Delta / Sigma independent of the respective gains of the sum and difference amplifiers K being the reference AGC value.
Inventors
- 👤 R Tabourier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:44
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4436
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
215 words
In a monopulse system having receiving antenna means, input means for supplying sum and difference signals from recurrent pulses of predetermined carrier frequency reflected by extraneous objects and an output terminal for providing an output signal representing an indication of the position of such object, the combination therewith of, a first variable-gain-amplifier known as ''''sum amplifier'''' for amplifying said sum signal, a second variable-gain-amplifier known as ''''difference amplifier'''' for amplifying said difference signal, gain control means for supplying both amplifiers with one and the same gain control signal, a synchronous demodulator having a first and a second inputs connected to said sum and difference amplifiers respectively for providing said output signal, first switch means having two inputs and one output inserted between said input means and said difference amplifier for alternately providing sum and difference signals to said difference amplifier, said sum signal being provided to said difference amplifier during one recurrence among a plurality thereof, said sum signal being provided to said sum amplifier during at least a substantial portion of recurrences except said one and said difference signal being simultaneously provided to said difference amplifier, and second switch Means synchronised with said first switch means inserted between said difference amplifier and said output terminal for supplying said gain-control means with said sum signal.
Claim 2
Dependent Claim
215 words
In a monopulse system having receiving antenna means, input means for supplying sum and difference signals from recurrent pulses of predetermined carrier frequency reflected by extraneous objects and an output terminal for providing an output signal representing an indication of the position of such object, the combination therewith of, a first variable-gain-amplifier known as ''''sum amplifier'''' for amplifying said sum signal, a second variable-gain-amplifier known as ''''difference amplifier'''' for amplifying said difference signal, gain control means for supplying both amplifiers with one and the same gain control signal, a synchronous demodulator having a first and a second inputs connected to said sum and difference amplifiers respectively for providing said output signal, first switch means having two inputs and one output inserted between said input means and said difference amplifier for alternately providing sum and difference signals to said difference amplifier, said sum signal being provided to said difference amplifier during one recurrence among a plurality thereof, said sum signal being provided to said sum amplifier during at least a substantial portion of recurrences except said one and said difference signal being simultaneously provided to said difference amplifier, and second switch Means synchronised with said first switch means inserted between said difference amplifier and said output terminal for supplying said gain-control means with said sum signal.
Claim 3
Dependent Claim
66 words
The combination defined in claim 1 wherein said second switch means is inserted between said difference amplifier and said synchronous demodulator and has one input and two outputs, said input being connected to the output of said difference amplifier, the first output being connected to the input of said gain control means, and the second output being connected to said second input of said synchronous demodulator.
Claim 4
Dependent Claim
62 words
The combination defined in claim 1 wherein said second switch means is inserted between said synchronous demodulator and said output terminal and has one input and two outputs, said input being connected to the output of said synchronous demodulator, the first output being connected to the input of said gain control means and the second output being connected to said output terminal.
Claim 5
Dependent Claim
46 words
The combination defined in claim 2 wherein said gain-control means comprises in series an amplitude detector, a comparator for comparing the amplitude of the output signal of said amplitude detector with that of a fixed reference signal, and a gain-control circuit for supplying said gain-control signal.
Claim 6
Dependent Claim
44 words
The combination defined in claim 3 wherein said gain-control means comprises in series a comparator for comparing the amplitude of the output signal of said synchronous demodulator with that of a fixed reference signal, and a gain-control circuit for supplying said gain control signal.
Claim 7
Dependent Claim
93 words
The combination defined in claim 3 wherein said gain-control means comprises on one hand in series a peak detector for detecting peaks of the output signal of said sum amplifier and a high-pass filter, on the other hand in series a comparator for comparing the amplitude of the output signal of said synchrones demodulator with that of a fixed reference signal and a low-pass filter, an adder for adding the output signals of said high-pass filter and said low-pass filter, and a gain-control circuit for supplying said gain-control signal, connected to said adder.
Claim 8
Dependent Claim
94 words
The combination defined in claim 3 wherein said first switch means has a third input for coupling the input of said difference amplifier to a zero potential during another recurrence among said plurality thereof, wherein said second switch means has a third output, wherein a first and a second store circuit for preserving the output signal of said synchronous demodulator are connected to said second and third output of said second switch means, and a substractor for comparing the output signals of said first and second store circuits is connected to said output terminal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |