IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0604182
(2003-06-30)
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등록번호 |
US-7751716
(2010-07-26)
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발명자
/ 주소 |
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출원인 / 주소 |
- University of South Florida
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
10 인용 특허 :
17 |
초록
▼
An open-path/free-space optical communication system using reflected light has modulated optical or laser sources and provides communication between the modulated source and a detector in an obstructed line-of-sight relationship. The system detects backscattered light impinging on a target illuminat
An open-path/free-space optical communication system using reflected light has modulated optical or laser sources and provides communication between the modulated source and a detector in an obstructed line-of-sight relationship. The system detects backscattered light impinging on a target illuminated by the source of light. Barrier objects positioned in a line-of-sight path between the source and detector are circumvented and a first device that provides the modulation signal for the source controls a remote second device.
대표청구항
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The invention claimed is: 1. A communication device for transmitting signals to a receiver comprising: at least one laser adapted to generate coherent light simultaneously at multiple wavelengths and different frequencies; said receiver including at least one detector adapted to detect said coheren
The invention claimed is: 1. A communication device for transmitting signals to a receiver comprising: at least one laser adapted to generate coherent light simultaneously at multiple wavelengths and different frequencies; said receiver including at least one detector adapted to detect said coherent light at multiple wavelengths and different frequencies; said at least one laser and said at least one detector being positioned in out of line-of-sight relation to one another; said at least one laser positioned at a first fixed distinct position in a first enclosed structure such as a first building; an opaque barrier positioned between said at least one laser and said at least one detector, said opaque barrier causing said at least one laser and said at least one detector to be in said out of line-of-sight relation to one another; a plurality of external remote laser targets and target spatial regions fixed in line-of-sight relation to said at least one laser and in line-of-sight relation to said at least one detector; said plurality of external remote laser targets and target spatial regions being disposed at a second fixed position remote from said first fixed position, said second fixed position being a second distinct position separated from said first distinct position by a large distance; said external remote laser targets and laser target spatial regions including trees, buildings, clouds, atmospheric aerosols, ambient atmosphere including atmospheric gases, and like objects that are out-of-doors relative to said at least one laser and relative to said at least one detector; a modulating device connected in modulating relation to said at least one laser, said modulating device disposed at said first fixed distinct position; said modulating device adapted to modulate each of said multiple wavelengths so that multiple messages are transmitted simultaneously; said communication device adapted to aim said modulated light from said at least one laser at said plurality of external remote targets and target spatial regions to separate spatially different communication optical signals from one another; said at least one detector adapted to demodulate light scattered by said target; said at least one detector being disposed at a third fixed distinct position remote from said second fixed distinct position in said line-of-sight relation to said external remote targets and said target spatial regions; said third fixed distinct position of said at least one detector being disposed a large distance from said first fixed distinct position of said at least one laser; said at least one detector including an optical bandpass filter adapted to pass preselected wavelengths of light and reject wavelengths of light outside of said preselected wavelengths; said optical bandpass filter being disposed at said third fixed distinct position; whereby multiple messages are simultaneously transmitted along multiple wavelengths and different frequencies; whereby said multiple messages are individually detected by said at least one detector and; whereby at least one laser beam follows a generally “V”-shaped path of travel between said at least one laser and said at least one detector. 2. A communication device adapted to reflect signals from a light reflecting target, comprising: a first data communication device adapted to transmit multiple sets of data through multiple wavelengths, there being as many wavelengths as there are sets of data; said first data communication device being disposed in a first fixed distinct position in an enclosed structure such as a first building; a laser source modulated by said first data communication device, said laser source disposed at said first fixed distinct position; a transmitter telescope adapted to aim modulated light of said multiple wavelengths from said laser source to a plurality of light-reflecting multiple external remote targets, said transmitter telescope disposed at said first fixed distinct position; said plurality of light-reflecting multiple external remote targets being disposed in a second fixed distinct position that is a large distance from said first fixed distinct position in line-of-sight relation to said first fixed distinct position; said plurality of light-reflecting multiple external remote targets including trees, buildings, clouds, atmospheric aerosols, ambient atmosphere including atmospheric gases, and like objects that are out-of-doors relative to said first data communication device; a second data communication device adapted to receive multiple sets of data carried by said multiple wavelengths; said second data communications device being disposed in a third fixed distinct position in an enclosed structure such as a second building that is a large distance from said second fixed distinct position in line-of-sight relation to said second fixed distinct position; an optical detector connected in driving relation to said second data communication device, said optical detector adapted to generate electrical signals corresponding to detected optical signals and said optical detector being positioned in said second building; a receiving telescope, positioned in said second building, aimed at said plurality of light-reflecting external remote targets and adapted to collect modulated light reflected from said plurality of light-reflecting external remote targets at said multiple wavelengths and to deliver said modulated light to said optical detector; an optical bandpass filter connected between said receiving telescope and said optical detector, said optical bandpass filter positioned in said second building; an opaque barrier means adapted to be positioned between said first and second data communication devices, said barrier means preventing line-of-sight communication between said respective first and third fixed distinct positions of said first and second data communication devices, respectively; said communication device being adapted to aim said modulated light from said laser at said plurality of external remote targets at said second fixed distinct position to separate spatially different communication optical signals from one another; said transmitter telescope causing modulated light at multiple wavelengths to reflect from said plurality of light-reflecting external remote targets; said receiver telescope causing reflected light at said multiple wavelengths to focus on said optical detector; said second data communication device receiving electrical signals from said first data communication device; said optical bandpass filter passing each of said multiple wavelengths to said optical detector so that multiple messages are sent simultaneously from said first data communications device to said second data communications device; whereby at least one laser beam follows a “V”-shaped path of travel between said first and second data communication devices. 3. A communication device adapted to reflect signals from remote laser targets positioned in an environment external to the environment of the communication device, comprising: a first data communication device adapted to transmit data; said first data communication device disposed at a first fixed distinct position in an enclosure such as a first building; said remote laser targets including trees, buildings, clouds, atmospheric aerosols, and like substantially stationary objects in said environment external to the environment of the communication device; said remote targets disposed at a second fixed distinct position that is a large distance from said first fixed distinct position in line-of-sight relation to said first fixed distinct position; a laser source modulated by said first data communication device, said laser source being positioned in said first building; a transmitter telescope adapted to aim modulated light from said laser source to a remote laser target positioned in said environment external to the environment of said communication device, said transmitter telescope being positioned in said first building; a second data communication device adapted to receive data; said second data communication device disposed at a third fixed distinct position in an enclosed structure such as a second building remote from said first and second fixed distinct positions in line-of-sight relation to said second fixed distinct position; said first and second data communication devices being positioned in out of line-of-sight relation to one another; an optical detector connected in driving relation to said second data communication device, said optical detector adapted to generate electrical signals corresponding to detected optical signals, said optical detector being positioned in said second building; a receiving telescope adapted to collect modulated light reflected from said remote laser target and to deliver said modulated light to said optical detector; said receiving telescope disposed at said third fixed distinct position; an opaque, signal-attenuating barrier means adapted to be positioned between said first and second data communication devices, said opaque signal-attenuating barrier means preventing line-of-sight communication between said first and second data communication devices; said first data communication device being adapted to aim said modulated light from said laser at said remote laser targets to separate spatially different communication optical signals from one another; said transmitter telescope causing modulated light to reflect from said remote laser targets; said receiving telescope causing reflected light to focus on said optical detector; said second data communication device receiving electrical signals from said first data communication device; whereby at least one laser beam follows a “V”-shaped path of travel between said first and second data communication devices. 4. The communication device of claim 3, further comprising an optical bandpass filter connected between said receiving telescope and said optical detector. 5. A LIDAR communication system, comprising: a laser adapted to generate a LIDAR beam; a data transmitting device for modulating said laser; said data transmitting device disposed at a first fixed distinct position in an enclosed structure such as a first building; a transmit telescope disposed at said first fixed distinct position adapted to aim said LIDAR beam at a plurality of external remote laser targets and laser target spatial regions; said plurality of external remote laser targets and laser target spatial regions being disposed at a second fixed distinct position that is a large distance from said first fixed distinct position in line-of-sight relation to said first fixed distinct position; a receiver telescope adapted to collect said LIDAR beam after said LIDAR beam has reflected from said remote laser target; an optical detector means in communication with said receiver telescope, said optical detector means adapted to generate electrical signals upon receiving reflected light from said receiver telescope; a data receiving device adapted to receive electrical signals from said optical detector; said receiver telescope, said optical detector means, and said data receiving device being disposed at a third fixed distinct position remote from said second fixed distinct position in line of sight relation to said second fixed distinct position, said third fixed distinct position being in an enclosed structure such as a second building positioned external to said first building; said data transmitting device and said data receiving device being positioned in out of line-of-sight relation to one another; said LIDAR communication system being adapted to aim said modulated light from said LIDAR beam at said plurality of external remote laser targets and laser target spatial regions to separate spatially different communication optical signals from one another; said external remote laser targets and laser target spatial regions including trees, buildings, clouds, atmospheric aerosols, and like substantially stationary objects that are out-of-doors relative to said laser; said data receiving device receiving data from said data transmitting device even when said data receiving device is positioned in a location distant from said data transmitting device and when at least one opaque, signal-attenuating obstacle prevents line-of-sight communication between said data transmitting device and said data receiving device; whereby said LIDAR beam follows a generally “V”-shaped path of travel from said laser to said data receiving device. 6. The LIDAR communication system of claim 5, further comprising: an electrical signal conditioner disposed in electrical communication between said data transmitting device and said laser, said electrical signal conditioner adapted to condition signals from said data transmitting device. 7. The LIDAR communication system of claim 5, further comprising: an electrical signal conditioner disposed in electrical communication between said optical detector and said data receiving device, said electrical signal conditioner adapted to condition electrical signals from said optical detector. 8. The communication device of claim 5, further comprising an optical bandpass filter disposed between said receiver telescope and said optical detector at said third fixed distinct position. 9. The communication device of claim 3, further comprising multiple optical wavelengths for communication of different communication signals simultaneously when the same external remote laser target is used as a common target for multiple communication devices. 10. The communication device of claim 3, further comprising multiple optical wavelengths for communication of different communication signals simultaneously when the same external remote laser target is used as a common target for LIDAR communication devices. 11. The communication device of claim 5, further comprising multiple optical wavelengths for communication of different communication signals simultaneously when the same external remote laser target is used as a common target for multiple communication devices. 12. The communication device of claim 5, further comprising multiple optical wavelengths for communication of different communication signals simultaneously when the same external remote laser target is used as a common target for LIDAR communication devices. 13. The communication device of claim 3, further comprising an optical signal transmitted to a remote external laser target wherein the backscattered optical signal is detected simultaneously by multiple telescope receivers positioned at different locations. 14. The communication device of claim 3, further comprising a common optical signal transmitted to a remote external laser target wherein the backscattered optical signal is detected simultaneously by multiple telescope receivers positioned at different locations. 15. The communication device of claim 5, further comprising an optical signal transmitted to a remote external laser target wherein the backscattered optical signal is detected simultaneously by multiple telescope receivers positioned at different locations. 16. The communication device of claim 5, further comprising a common optical signal transmitted to a remote external laser target wherein the backscattered optical signal is detected simultaneously by multiple telescope receivers positioned at different locations. 17. The communication device of claim 1, further comprising: a plurality of external remote laser targets including atmospheric backscatter in non-line-of-sight relation to said detector; said detector adapted to detect multipath backscatter from said multiple backscatter spatial target regions.
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