Optical non-line-of-sight covert, secure high data communication system
First Claim
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1. An apparatus for omnidirectionally communicating non-line-of-sight in the ultraviolet spectrum comprising:
- at least one Hg-Ar discharge lamp for generating and omnidirectionally radiating an ultraviolet carrier signal in the two-hundred-thirty to two-hundred-eighty nm spectral range in the tens of watts power range;
an on/off keying device coupled to the at least one Hg-Ar discharge lamp for modulating the ultraviolet carrier signal in a series of pulses; and
means remotely disposed from and in a non-line-of-sight relationship to the at least one Hg-Ar discharge lamp for receiving and demodulating scattered parts of the pulse modulated ultraviolet signal, the receiving and demodulating means having a wide field of view to increase the received signal strength.
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Abstract
An omnidirectional non-line-of-sight communication capability is assured byransmission and reception in the "solar blind" ultraviolet spectrum. An omnidirectional ultraviolet source generates a UV carrier in the tens of watts power range. This is modulated and received by having a sensitivity to respond to scattered UV modulated energy. Pulse modulating the ultraviolet spectrum signal and providing appropriate logic circuitry associated with the wide field-of-view receiver reduces the values of bit error rate.
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Citations
13 Claims
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1. An apparatus for omnidirectionally communicating non-line-of-sight in the ultraviolet spectrum comprising:
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at least one Hg-Ar discharge lamp for generating and omnidirectionally radiating an ultraviolet carrier signal in the two-hundred-thirty to two-hundred-eighty nm spectral range in the tens of watts power range; an on/off keying device coupled to the at least one Hg-Ar discharge lamp for modulating the ultraviolet carrier signal in a series of pulses; and means remotely disposed from and in a non-line-of-sight relationship to the at least one Hg-Ar discharge lamp for receiving and demodulating scattered parts of the pulse modulated ultraviolet signal, the receiving and demodulating means having a wide field of view to increase the received signal strength. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of communicating in the ultraviolet spectrum comprising:
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generating an ultraviolet signal in the "solar blind" region in the tens of watts power range; modulating the ultraviolet signal; radiating the modulated ultraviolet signal omnidirectionally; receiving the radiated modulated ultraviolet signal at a non-line-of-sight location anywhere within the range of the omnidirectionally radiated modulated ultraviolet signal; and demodulating the received ultraviolet signal. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification