Secure spread spectrum communication system

Details Secure spread spectrum communication system Secure spread spectrum communication system

1969-07-22

1980-12-23

Birmiel, Howard A.

Pulse or digital communications

Repeaters

Testing

455 26, 371 3, H04K 100, H04K 300

Patent

active

042414474

ABSTRACT:
A communication system is protected against jamming by modifying a conventional spread spectrum communication system by inserting errors, in the form of digital noise, into the pseudo-noise digital code used to generate the spread spectrum carrier. A bidirectional system is provided so that when jamming occurs, as a consequence of breaking the corrupted spread spectrum code, the pseudo-noise digital code and/or the percent of errors is changed in a prearranged manner to compensate for the jamming and/or reduce the likelihood of breaking the corrupted spread spectrum code. A conventional correlation receiver is employed to recover the intelligence.

REFERENCES:
patent: 3305636 (1967-02-01), Webb
patent: 3351859 (1967-11-01), Groth, Jr. et al.
patent: 3432619 (1969-03-01), Blasbalg

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