Scrambled chirp frequency jitter for feature suppression

Details Scrambled chirp frequency jitter for feature suppression Scrambled chirp frequency jitter for feature suppression

2007-12-11

2007-12-11

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S132000, C375S139000, C342S132000

Reexamination Certificate

active

10668024

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.

REFERENCES:
patent: 4309703 (1982-01-01), Blahut
patent: 4677617 (1987-06-01), O'Connor et al.
patent: 5084901 (1992-01-01), Nagazumi
patent: 6047018 (2000-04-01), Emi
patent: 6434184 (2002-08-01), Lindsey
patent: 6865216 (2005-03-01), Beamish et al
patent: 2006/0239334 (2006-10-01), Kwon et al.

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