Secure spread spectrum communication system
First Claim
Patent Images
1. Secure communication apparatus comprising:
- a first source of a given pseudo-noise digital code;
first means coupled to said source to corrupt said given digital code by a predetermined percent of and distribution of errors;
second means coupled to said first means to generate a spread spectrum signal in response to said corrupted given digital code;
a second source of intelligence; and
third means coupled to said second source and said second means to transmit said spread spectrum signal modulated by said intelligence.
1 Assignment
0 Petitions
Accused Products
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.
28 Citations
10 Claims
-
1. Secure communication apparatus comprising:
-
a first source of a given pseudo-noise digital code; first means coupled to said source to corrupt said given digital code by a predetermined percent of and distribution of errors; second means coupled to said first means to generate a spread spectrum signal in response to said corrupted given digital code; a second source of intelligence; and third means coupled to said second source and said second means to transmit said spread spectrum signal modulated by said intelligence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification