Scrambled chirp frequency jitter for feature suppression
US7308043B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 2003 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Aug 23, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/003
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of minimizing detectability of an electronically communicated message is disclosed. A predetermined frequency modulation pattern about a nominal transmission frequency is defined. The predetermined frequency modulation pattern is suitable to vary the nominal transmission frequency during a dwell period. The dwell period is divided into a plurality of sub-dwell periods. Each sub-dwell period has a nominal sub-frequency assigned thereto according to the predetermined frequency modulation pattern. The plurality of sub-dwell periods and the respective assigned nominal sub-frequencies are randomly or pseudo-randomly ordered. The message is transmitted according to the random or pseudo-random ordering of the nominal sub-frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.