Patent US5805635A successfully refreshed from Google Patents.
US5805635A
Expired / Lapsed
US
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Secure communication system
Assignee: United States Department of the Navy
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Filing: 1964-03-17
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Granted: 1998-09-08
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Expires: 1984-03-17
Abstract
Abstract A secure communication system comprising: a first cyclical pseudo-random noise generator comprising determinable vable starting point means and an output; transmitting means for transmitting said pseudo-random noise generator output; receiving means for receiving said transmitting means transmissions, said receiving means having an output; recycling storage means for storing said receiving means output; a second cyclical pseudo-random noise generator identical to said first pseudo-random noise generator having an output and a reset input, said receiving means output connected to said reset input; a correlator having a first input connected to said storage means and a second input connected to said second pseudo-random noise generator output and an output from said correlator; and timing means connected to said receiving means output and said correlator output for measuring time elapsed between any output of said receiver and said correlator.
Inventors
- 👤 Daniel E. Andrews, Jr.
- 👤 William E. Klund
- 👤 Robert D. Isaak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:22
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; H04B1/709; H04K; H04K1/00; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70715
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A secure communication system comprising: a first cyclical pseudo-random noise generator comprising determinable variable starting point means and an output; transmitting means for transmitting said pseudo-random noise generator output; receiving means for receiving said transmitting means transmissions, said receiving means having an output; recycling storage means for storing said receiving means output; a second cyclical pseudo-random noise generator identical to said first pseudo-random noise generator having an output and a reset input, said receiving means output connected to said reset input; a correlator having a first input connected to said storage means and a second input connected to said second pseudo-random noise generator output and an output from said correlator; and is timing means connected to said receiving means output and said correlator output for measuring time elapsed between any output of said receiver and said correlator.
Claim 2
Dependent Claim
137 words
A secure communication system comprising: a first cyclical pseudo-random noise generator comprising determinable variable starting point means and an output; transmitting means for transmitting said pseudo-random noise generator output; receiving means for receiving said transmitting means transmissions, said receiving means having an output; recycling storage means for storing said receiving means output; a second cyclical pseudo-random noise generator identical to said first pseudo-random noise generator having an output and a reset input, said receiving means output connected to said reset input; a correlator having a first input connected to said storage means and a second input connected to said second pseudo-random noise generator output and an output from said correlator; and is timing means connected to said receiving means output and said correlator output for measuring time elapsed between any output of said receiver and said correlator.
Claim 3
Dependent Claim
14 words
The secure communication system of claim 1 wherein said storage means comprises a deltic.
Claim 4
Dependent Claim
17 words
The secure communication system of claim 1 wherein said storage means comprises an incremental recirculating delay line.
Claim 5
Dependent Claim
29 words
The secure communication system of claim 1 further comprising a threshold detector coupled between said receiver output and said storage for triggering the start of storage of received signals.
Claim 6
Dependent Claim
30 words
The secure communication system of claim 1 and further including means for determining said variable starting point of said first pseudo-random noise generator connected to said first pseudo-random noise generator.
Claim 7
Dependent Claim
54 words
The secure communication system of claim 1 wherein said timing means comprises: a counter having a start input, a stop input, and a clock pulse input; said start input connected to said receiving means output; said stop input connected to said correlator output; and a clock pulse generator connected to said clock pulse input.
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) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |