US5113443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for scrambling satellite communications
Assignee: Individual
•
Filing: 1990-07-09
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Granted: 1992-05-12
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Expires: 2010-07-09
Abstract
Abstract A secure communications system multiplexes segments of the information signal for keyed encoding and modulation onto a plurality of different carrier frequencies and/or polarizations, and transmits the encoded carriers to multi-channel signal summing receivers that decode the segments from all channels, to reassemble the information signal for use by authorized stations with a key. The use of the multi-channel link and the summing receiver allows the greatest number of different coding algorithms for accommodating the greatest number of discrete secure channels.
Inventors
- 👤 Milton H. Brockman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:31
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/084; H04B7/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
The method of frequency diversity encryption for scrambling communications of information signals radiated on a plurality of carriers, between authorized multi-channel stations, each channel having a different carrier frequency, the radiated information signals being modulation-method independent and encoding-method independent, the method of frequency diversity encryption comprising the steps of: splitting up the encoded information signals into segments for multi-channel transmission; encrypting the encoded information signal segments by multiplex modulating the segments onto the plurality of separate carrier frequencies in a sequence according to an algorithm having a key; transmitting the multiplex modulated encoded information signal segments modulated onto the plurality of separate carrier frequencies to provide multichannel scrambled transmission; receiving the scrambled multichannel transmission and amplifying, coherently heterodyning, and summing the separate carrier frequencies: demodulating and summing the multiplex modulated encoded information signal segments of the encoded information signals on the separate carrier frequencies; demultiplexing the summed multiplexed segments according to said algorithm using said key, and distributing the summed demultiplexed encoded information signals to authorized users of each encoded information signal.
Claim 2
Independent Claim
172 words
The method of frequency diversity encryption for scrambling communications of information signals radiated on a plurality of carriers, between authorized multi-channel stations, each channel having a different carrier frequency, the radiated information signals being modulation-method independent and encoding-method independent, the method of frequency diversity encryption comprising the steps of: splitting up the encoded information signals into segments for multi-channel transmission; encrypting the encoded information signal segments by multiplex modulating the segments onto the plurality of separate carrier frequencies in a sequence according to an algorithm having a key; transmitting the multiplex modulated encoded information signal segments modulated onto the plurality of separate carrier frequencies to provide multichannel scrambled transmission; receiving the scrambled multichannel transmission and amplifying, coherently heterodyning, and summing the separate carrier frequencies: demodulating and summing the multiplex modulated encoded information signal segments of the encoded information signals on the separate carrier frequencies; demultiplexing the summed multiplexed segments according to said algorithm using said key, and distributing the summed demultiplexed encoded information signals to authorized users of each encoded information signal.
Claim 3
Dependent Claim
50 words
The method, of frequency diversity encryption for scrambling communications of information signals radiated on a plurality of carriers, as described in claim 1, wherein unrelated information signals are transmitted on separate carrier frequencies, whereby a network of receiving stations, each having a summed receiver, demodulates part of an information signal.
Claim 4
Dependent Claim
37 words
The method of frequency diversity encryption for scrambling communications of information signals radiated on a plurality of carriers, as described in claim 1 or 2, wherein information signals are transmitted on separate polarizations of the carrier frequencies.
Claim 5
Dependent Claim
42 words
The method of frequency diversity encryption for scrambling communications of information signals radiated on a plurality of carriers, as described in claim 1 or 2, wherein information signals are transmitted on separate carrier frequencies, and on separate polarizations of the carrier frequencies.
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) | 1995-05-12 | 1995-11-11 | 1996-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-12 | 1999-11-11 | 2000-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-12 | 2003-11-11 | 2004-05-12 | $7700.00 | Window Closed / Lapsed |