US4739186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-selectable pulsed-sinusoid generation system
Assignee: Raytheon Co
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Filing: 1986-08-18
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Granted: 1988-04-19
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Expires: 2006-08-18
Abstract
Abstract A system for generating a sequence of pulses of carrier having individually selectable frequencies employs a pulsed oscillator for providing a single pulse of a carrier signal having a predetermined frequency. The single pulse is applied to a dispersive filter imparting a delay to signals dependent of their spectral content. The relatively broad spectrum of the single pulse is converted by the dispersive filter into a swept frequency pulse of much longer duration than the input pulse to the filter. The expanded signal is mixed with a set of mixing frequencies to provide a set of expanded signals, each of which is then gated to attain spectral portions having desired average values of frequency. The expanded signals are then summed together and applied to a compressive filter which operates in the mirror-image format to the dispersive filter. The compressive filter compresses each of the pulses of the expanded signals to a narrow pulse signal, the compressive filter outputting a succession of compressed pulses having carrier frequencies corresponding to those selected during the gating of the expanded signals.
Inventors
- 👤 Rex J. Crookshanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:53
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/7136; G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/284; G01S13/286; H04B2001/71362
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
92 words
A frequency-selectable pulse generation system comprising: means for simultaneously generating from a single input pulse a set of simultaneous swept-frequency signals offset in frequency from each other; means for selecting a portion of each of said swept-frequency signals in response to control signals from a control signal source; and means coupled to said selecting means for compressing the selected portion of each of said signals to provide a succession of output pulses, said compressing means delaying each of said output pulses in accordance with a frequency content of the corresponding selected portion.
Claim 2
Dependent Claim
92 words
A frequency-selectable pulse generation system comprising: means for simultaneously generating from a single input pulse a set of simultaneous swept-frequency signals offset in frequency from each other; means for selecting a portion of each of said swept-frequency signals in response to control signals from a control signal source; and means coupled to said selecting means for compressing the selected portion of each of said signals to provide a succession of output pulses, said compressing means delaying each of said output pulses in accordance with a frequency content of the corresponding selected portion.
Claim 3
Dependent Claim
24 words
A system according to claim 1 wherein said selecting means selects each of said portions in accordance with a desired range of frequency sweep.
Claim 4
Dependent Claim
25 words
A system according to claim 1 wherein said selecting means selects each of said portions in accordance with a time of occurrence of said portion.
Claim 5
Dependent Claim
22 words
A system according to claim 1 wherein said selecting means includes means for shaping an envelope of each of said selected portions.
Claim 6
Dependent Claim
37 words
A system according to claim 4 wherein each of said swept-frequency signals has a carrier, and said selecting means includes means for adjusting the phase of the carrier in the selected portion of each of said signals.
Claim 7
Dependent Claim
38 words
A system according to claim 5 wherein a frequency of said carrier varies with time, and the selected portion of each of said signals occurs in a selected interval of time corresponding to a selected range of frequencies.
Claim 8
Dependent Claim
14 words
A system according to claim 6 wherein said carrier frequency varies linearly with time.
Claim 9
Dependent Claim
78 words
A system according to claim 1 wherein said generating means comprises: pulsed-oscillator means for providing as the single input pulse a portion of a carrier signal from a carrier signal source; and a dispersive filter having a time delay versus frequency characteristic extending over a spectral region of said pulse of carrier signal, said dispersive filter converting said pulse of carrier signal into an expanded swept-frequency signal used in the generation of the set of simultaneous swept-frequency signals.
Claim 10
Dependent Claim
38 words
A system according to claim 8 wherein said generating means further comprises mixing means coupled to said dispersive filter for mixing said expanded swept-frequency signal with a set of reference signals to produce said set of swept-frequency signals.
Claim 11
Dependent Claim
24 words
A system according to claim 9 wherein said selecting means selects each of said portions in accordance with a desired range of frequency sweep.
Claim 12
Dependent Claim
25 words
A system according to claim 9 wherein said selecting means selects each of said portions in accordance with a time of occurrence of said portion.
Claim 13
Dependent Claim
22 words
A system according to claim 9 wherein said selecting means includes means for shaping an envelope of each of said selected portions.
Claim 14
Dependent Claim
37 words
A system according to claim 12 wherein each of said swept-frequency signals has a carrier, and said selecting means includes means for adjusting the phase of the carrier in the selected portion of each of said signals.
Claim 15
Dependent Claim
38 words
A system according to claim 13 wherein a frequency of said carrier varies with time, and the selected portion of each of said signals occurs in a selected interval of time corresponding to a selected range of frequencies.
Claim 16
Dependent Claim
14 words
A system according to claim 14 wherein said carrier frequency varies linearly with time.
Claim 17
Dependent Claim
135 words
A pulse frequency generation system comprising: means for generating a pulse of carrier signal having a predetermined duration; means for expanding said signal to be a first expanded signal extending over an interval of time longer than the duration of said pulse; means for duplicating the format of said first expanded signal to provide simultaneously a set of second expanded signals having the same format but being offset from each other in frequency; means coupled to said duplicating means for modulating each of said second expanded signals to have selected amplitude and frequency characteristics in response to control signals from a control signal source; and means coupled to said modulating means for compressing each of said second expanded signals to provide a sequence of compressed signals which correspond to respective ones of said expanded signals.
Claim 18
Dependent Claim
135 words
A pulse frequency generation system comprising: means for generating a pulse of carrier signal having a predetermined duration; means for expanding said signal to be a first expanded signal extending over an interval of time longer than the duration of said pulse; means for duplicating the format of said first expanded signal to provide simultaneously a set of second expanded signals having the same format but being offset from each other in frequency; means coupled to said duplicating means for modulating each of said second expanded signals to have selected amplitude and frequency characteristics in response to control signals from a control signal source; and means coupled to said modulating means for compressing each of said second expanded signals to provide a sequence of compressed signals which correspond to respective ones of said expanded signals.
Claim 19
Dependent Claim
51 words
A system according to claim 16 wherein said expanding means comprises a dispersive filter having a time delay versus frequency characteristic extending over a spectral region of said pulse of carrier signal, said dispersive filter converting said pulse of carrier signal into a swept-frequency signal which constitutes said first expanded signal.
Claim 20
Dependent Claim
37 words
A system according to claim 17 wherein said duplicating means comprises mixing means coupled to said dispersive filter for mixing said swept-frequency signal with a set of reference signals to produce said set of second expanded signals.
Claim 21
Dependent Claim
17 words
A system according to claim 18 wherein each of said second expanded signals is a swept-frequency signal.
Claim 22
Dependent Claim
23 words
A system according to claim 19 wherein said modulating means includes means for gating a portion of each of said second expanded signals.
Claim 23
Dependent Claim
35 words
A system according to claim 20 wherein said compressing means includes means coupled to said modulating means for summing together each of said second expanded signals prior to a compression of said second expanded signals.
Claim 24
Dependent Claim
29 words
A system according to claim 21 wherein said compressing means further comprises a filter having a delay dependent on the instantaneous frequency of each of said second expanded signals.
Claim 25
Dependent Claim
23 words
A system according to claim 16 wherein said modulating means includes means for gating a portion of each of said second expanded signals.
Claim 26
Dependent Claim
35 words
A system according to claim 23 wherein said compressing means includes means coupled to said modulating means for summing together each of said second expanded signals prior to a compression of said second expanded signals.
Claim 27
Dependent Claim
29 words
A system according to claim 24 wherein said compressing means further comprises a filter having a delay dependent on the instantaneous frequency of each of said second expanded signals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |