Secure spread spectrum communication system
US4241447A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1969 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Jul 22, 1989 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K2203/36
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.