Patent ID: 7308043

Claim:
A method of minimizing detectability of an electronically communicated message, comprising: establishing a nominal transmission frequency; establishing a dwell period; defining a predetermined frequency modulation pattern about the nominal transmission frequency, the predetermined frequency modulation pattern being suitable to vary the nominal transmission frequency during the dwell period; dividing the dwell period into a plurality of sub-dwell periods, where each sub-dwell period has a nominal sub-frequency assigned thereto according to the predetermined frequency modulation pattern; randomly ordering the plurality of sub-dwell periods and the respective assigned nominal sub-frequencies; transmitting the message according to the random ordering of the nominal sub-frequencies; for each randomly ordered nominal sub-frequency, varying the nominal sub-frequency during the respective sub-dwell period by one of increasing and decreasing the nominal sub-frequency; transmitting the message at frequencies by which each randomly ordered nominal sub-frequency has been increased or decreased; and increasing a time that the transmitted frequency transitions, while still transmitting, from one randomly ordered nominal sub-frequency to a next randomly ordered nominal sub-frequency.