Slow hopping anti-jam waveform (SHAW)
AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy
InventorsAndrew Robertson, Joseph A. Molnar, Frank Fu
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Abstract
A method of transmitting a message using a slow hopping anti-jam waveform, includes generating a sequence with a cryptographic hash function; transmitting, for a predetermined dwell time, a first portion of the message on a first channel having a first baseline frequency; choosing a second channel having a second baseline frequency based on the generated sequence, the second baseline frequency being offset from the first baseline frequency; and transmitting, for the predetermined dwell time, a second portion of the message on the second channel having the second baseline frequency; wherein the two transmitting steps occur sequentially.
Claims6
A method of transmitting a message using a slow hopping anti-jam waveform, the method comprising the steps of:
- generating a sequence with a cryptographic hash function;
- transmitting, for a predetermined dwell time, a first portion of the message on a first channel having a first baseline frequency;
- choosing a second channel having a second baseline frequency based on the generated sequence, the second baseline frequency being offset from the first baseline frequency;
- transmitting, for the predetermined dwell time, a second portion of the message on the second channel having the second baseline frequency;
- and
- transmitting a resynch pulse for cold rendezvous
- wherein the two transmitting, for a predetermined dwell time, steps occur sequentially, and
- wherein transmitting the resynch pulse includes a Chu sequence for precise timing, a senders time-stamp at which the Chu sequence was sent, a random number generated by a sync node for each packet, and a verification portion.
Dependencies are inferred from the claim text.