US5473694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronization of nonautonomous chaotic systems
Assignee: United States, NAVY CHIEF OF NAVAL RESEARCH OFFICE OF COUNSEL, Secretary of
•
Filing: 1994-06-29
•
Granted: 1995-12-05
•
Expires: 2014-06-29
Abstract
Abstract A cascaded synchronized system includes a nonlinear transmitter, a nonlinear cascaded receiver, a phase-detector/controller coupled to the receiver, and a signal generator also coupled to the receiver. The transmitter is responsive to an externally generated transmitter forcing signal for producing and transmitting a chaotic communications signal containing phase information. The cascaded receiver is responsive to a receiver forcing signal and to the chaotic communications signal for producing a chaotic receiver output signal containing phase information. The phase-detector/controller is responsive to the chaotic communications signal and to the receiver output signal for producing a correction signal. The signal generator is responsive to the correction signal for producing the receiver forcing signal in phase with and having the same frequency as the transmitter forcing signal.
Inventors
- 👤 Thomas L. Carroll
- 👤 Louis M. Pecora
- 👤 James F. Heagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:51
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/001
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
101 words
A cascaded synchronized system comprising: (a) a nonlinear transmitter responsive to a transmitter forcing signal for producing and transmitting a chaotic communications signal containing phase information; (b) a nonlinear cascaded receiver responsive to a receiver forcing signal and the communications signal for producing a receiver output signal; (c) a phase-detector/controller coupled to said receiver (b) being responsive to the communications signal for producing a correction signal; and (d) a signal generator coupled to said receiver (b) being responsive to the correction signal for producing the receiver forcing signal in phase with and having the same frequency as the transmitter forcing signal.
Claim 2
Dependent Claim
101 words
A cascaded synchronized system comprising: (a) a nonlinear transmitter responsive to a transmitter forcing signal for producing and transmitting a chaotic communications signal containing phase information; (b) a nonlinear cascaded receiver responsive to a receiver forcing signal and the communications signal for producing a receiver output signal; (c) a phase-detector/controller coupled to said receiver (b) being responsive to the communications signal for producing a correction signal; and (d) a signal generator coupled to said receiver (b) being responsive to the correction signal for producing the receiver forcing signal in phase with and having the same frequency as the transmitter forcing signal.
Claim 3
Dependent Claim
20 words
The system of claim 1 wherein said receiver (b) produces the receiver output signal in synchronization with the communications signal.
Claim 4
Dependent Claim
110 words
The system of claim 1 wherein: said transmitter (a) comprises stable first and second subparts, said first subpart being responsive to the communications signal for producing a first transmitter signal, said second subpart being responsive to the transmitter forcing signal and the first transmitter signal for producing the chaotic communications signal; and said receiver (b) comprises first and second stages which are duplicates of said first and second subparts of said transmitter (a), respectively, said first stage being responsive to the communications signal for producing a first receiver signal, said second stage being responsive to the first receiver signal and the receiver forcing signal for producing the receiver output signal.
Claim 5
Dependent Claim
110 words
The system of claim 2 wherein: said transmitter (a) comprises stable first and second subparts, said first subpart being responsive to the transmitter forcing signal and the communications signal for producing a first transmitter signal, said second subpart being responsive to the first transmitter signal for producing the chaotic communications signal; and said receiver (b) comprises first and second stages which are duplicates of said first and second subparts of said transmitter (a), respectively, said first stage being responsive to the receiver forcing signal and the communications signal for producing a first receiver signal, said second stage being responsive to the first receiver signal for producing the receiver output signal.
Claim 6
Dependent Claim
47 words
The system of claim 3 wherein: said first subpart of said transmitter (a) is responsive to the transmitter forcing signal for producing the first transmitter signal; and said first stage of said receiver (b) is responsive to the receiver forcing signal for producing the first receiver signal.
Claim 7
Dependent Claim
52 words
The system of claim 1 wherein: said receiver (b) comprises means for producing the receiver output signal having phase information; and said phase-detector/controller (c) comprises means responsive to the receiver output signal for producing the correction signal indicative of the phase difference between the transmitter forcing signal and the receiver forcing signal.
Claim 8
Dependent Claim
15 words
The system of claim 6 wherein said phase-detector/controller (c) comprises a sample and hold circuit.
Claim 9
Dependent Claim
13 words
The system of claim 7 wherein said phase-detector/controller (c) comprises a bandpass filter.
Claim 10
Dependent Claim
50 words
The system of claim 1 wherein: said receiver (b) comprises means for producing a receiver signal having phase information; and said phase-detector/controller (c) comprises means responsive to the receiver signal for producing the correction signal indicative of the phase difference between the transmitter forcing signal and the receiver forcing signal.
Claim 11
Dependent Claim
53 words
The system of claim 1 further comprising: (e) means for producing a periodic reference signal; and (f) a phase comparator coupled to said receiver (b) being responsive to the periodic reference signal and the receiver forcing signal for producing a comparison signal; wherein said signal generator (d) is responsive to the comparison signal.
Claim 12
Dependent Claim
128 words
A cascaded information transfer system comprising: (a) a nonlinear transmitter responsive to an information signal and a transmitter forcing signal for producing and transmitting a transmitted signal; (b) a nonlinear cascaded receiver responsive to a receiver forcing signal and the transmitted signal for producing a receiver output signal; (c) a phase-detector/controller coupled to said receiver (b) being responsive to the transmitted signal for producing a correction signal; (d) a signal generator coupled to said receiver (b) being responsive to the correction signal for producing the receiver forcing signal in phase with and having the same frequency as the transmitter forcing signal; and (e) an error detector responsive to the transmitted signal and the receiver output signal for producing an error signal containing information contained in the information signal.
Claim 13
Dependent Claim
128 words
A cascaded information transfer system comprising: (a) a nonlinear transmitter responsive to an information signal and a transmitter forcing signal for producing and transmitting a transmitted signal; (b) a nonlinear cascaded receiver responsive to a receiver forcing signal and the transmitted signal for producing a receiver output signal; (c) a phase-detector/controller coupled to said receiver (b) being responsive to the transmitted signal for producing a correction signal; (d) a signal generator coupled to said receiver (b) being responsive to the correction signal for producing the receiver forcing signal in phase with and having the same frequency as the transmitter forcing signal; and (e) an error detector responsive to the transmitted signal and the receiver output signal for producing an error signal containing information contained in the information signal.
Claim 14
Dependent Claim
34 words
The system of claim 11 wherein said transmitter (a) comprises: means for producing a chaotic communications signal; and a modulator responsive to the communications signal and the information signal for producing the transmitted signal.
Claim 15
Dependent Claim
12 words
The system of claim 12 wherein said modulator comprises a nonlinear modulator.
Claim 16
Dependent Claim
109 words
The system of claim 12 wherein: said transmitter (a) comprises stable first and second subparts, said first subpart being responsive to the communications signal for producing a first transmitter signal, said second subpart being responsive to the transmitter forcing signal and the first transmitter signal for producing the communications signal; and said receiver (b) comprises first and second stages which are duplicates of said first and second subparts of said transmitter (a), respectively, said first stage being responsive to the transmitted signal for producing a first receiver signal, said second stage being responsive to the first receiver signal and the receiver forcing signal for producing the receiver output signal.
Claim 17
Dependent Claim
109 words
The system of claim 12 wherein: said transmitter (a) comprises stable first and second subparts, said first subpart being responsive to the transmitter forcing signal and the communications signal for producing a first transmitter signal, said second subpart being responsive to the first transmitter signal for producing the communications signal; and said receiver (b) comprises first and second stages which are duplicates of said first and second subparts of said transmitter (a), respectively, said first stage being responsive to the receiver forcing signal and the transmitted signal for producing a first receiver signal, said second stage being responsive to the first receiver signal for producing the receiver output signal.
Claim 18
Dependent Claim
47 words
The system of claim 14 wherein: said first subpart of said transmitter (a) is responsive to the transmitter forcing signal for producing the first transmitter signal; and said first stage of said receiver (b) is responsive to the receiver forcing signal for producing the first receiver signal.
Claim 19
Dependent Claim
52 words
The system of claim 11 wherein: said receiver (b) comprises means for producing the receiver output signal having phase information; and said phase-detector/controller (c) comprises means responsive to the receiver output signal for producing the correction signal indicative of the phase difference between the transmitter forcing signal and the receiver forcing signal.
Claim 20
Dependent Claim
15 words
The system of claim 17 wherein said phase-detector/controller (c) comprises a sample and hold circuit.
Claim 21
Dependent Claim
13 words
The system of claim 17 wherein said phase-detector/controller (c) comprises a bandpass filter.
Claim 22
Dependent Claim
50 words
The system of claim 11 wherein: said receiver (b) comprises means for producing a receiver signal having phase information; and said phase-detector/controller (c) comprises means responsive to the receiver signal for producing the correction signal indicative of the phase difference between the transmitter forcing signal and the receiver forcing signal.
Claim 23
Dependent Claim
53 words
The system of claim 11 further comprising: (a) means for producing a periodic reference signal; and (b) a phase comparator coupled to said receiver (b) being responsive to the periodic reference signal and the receiver forcing signal for producing a comparison signal; wherein said signal generator (d) is responsive to the comparison signal.
References Cited (Backward Citations)
US3439279A
Cited
US3947634A
Cited
US4301537A
Cited
US4790013A
Cited
US4606041A
Cited
US4799259A
Cited
US4827514A
Cited
US4893339A
Cited
US5007087A
Cited
US5048086A
Cited
US5245660A
Cited
US5379346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |