Systems and methods for concealing waveform properties
AssigneeRaytheon Company
InventorsGary M. Graceffo, Benjamin P. Dolgin, Andrew Kowalevicz
Life of this patent
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Abstract
Aspects are generally directed to free-space transmitters, free-space receivers, and free-space communication methods. In one example, a free-space communication method includes acts of mapping a data payload to one or more symbols based on a symbol set defined by a digital modulation scheme, varying one or more properties of a signal waveform to phase modulate the signal waveform with the data payload, the one or more symbols each having a symbol duration that defines a timing structure of the modulated signal waveform, and fragmenting the timing structure of the modulated signal waveform to conceal one or more waveform properties of the modulated signal waveform.
Claims16
A free-space communication method, the method comprising:
- mapping a data payload to one or more symbols based on a symbol set defined by a digital modulation scheme;
- varying one or more properties of a signal waveform to phase modulate the signal waveform with the data payload, the one or more symbols each having a symbol duration that defines a timing structure of the modulated signal waveform;
- and
- fragmenting the timing structure of the modulated signal waveform by adjusting the symbol duration of at least one of the one or more symbols to conceal one or more waveform properties of the modulated signal waveform.
A free-space communication method comprising:
- mapping a data payload to one or more symbols based on a symbol set defined by a digital modulation scheme;
- varying one or more properties of a signal waveform to phase modulate the signal waveform with the data payload, the one or more symbols each having a symbol duration that defines a timing structure of the modulated signal waveform;
- and
- fragmenting the timing structure of the modulated signal waveform to conceal one or more waveform properties of the modulated signal waveform, wherein fragmenting the timing structure of the modulated signal waveform includes inserting one or more false symbols in the data payload.
A free-space transmitter comprising:
- an input configured to receive a data payload;
- a mapping module configured to map the data payload to one or more symbols based on a symbol set defined by a digital modulation scheme;
- a modulator coupled to the mapping module and configured to vary one or more properties of a signal waveform to phase modulate the signal waveform with the data payload, the one or more symbols each having a symbol duration that defines a timing structure of the modulated signal waveform;
- and
- a fragment timing module coupled to the modulator and configured to adjust the symbol duration of at least one of the one or more symbols to fragment the timing structure of the modulated signal waveform to conceal one or more waveform properties of the modulated signal waveform.
A free-space transmitter comprising:
- an input configured to receive a data payload;
- a mapping module configured to map the data payload to one or more symbols based on a symbol set defined by a digital modulation scheme;
- a modulator coupled to the mapping module and configured to vary one or more properties of a signal waveform to phase modulate the signal waveform with the data payload, the one or more symbols each having a symbol duration that defines a timing structure of the modulated signal waveform;
- and
- a fragment timing module coupled to the modulator and configured to insert one or more false symbols in the data payload to fragment the timing structure of the modulated signal waveform to conceal one or more waveform properties of the modulated signal waveform.
Dependencies are inferred from the claim text.