Remote data monitoring system
First Claim
1. A remote data monitoring system for interrogating information from a remote interrogated location, comprising laser transmitter-receiver means (10) at an interrogating location, to transmit a laser beam (11) comprising upper and lower frequency bands, and retroreflector means (40) at said remote interrogated location, said laser transmitter-receiver means (10) comprising a laser transmitter section (20) including laser transmitter means (23, 24, 25, 26) including a semiconductor laser (23) and wavelength stabilizing means as part of said semiconductor laser (23) for stabilizing the wavelength of said semiconductor laser (23) and an IFF-code generator means (21) operatively connected to said laser transmitter means for modulating said upper frequency band onto said laser beam (11) transmitted by said laser transmitter means (23, 24, 25, 26), said laser transmitter-receiver means further comprising a laser receiver section (30) for receiving a reflected beam (41) comprising upper and lower frequency bands, said receiver section (30) including laser receiver means (31, 32, 33, 34, 35), an IFF-code demodulator (37) and first control means (12) connected to said IFF-code demodulator (37) and to said laser transmitter means for controlling the laser transmitter means in accordance with received information, said laser receiver section (30) further comprising transducer means (38) connected to said IFF-code demodulator (37) for providing an information output, said retroreflector means (40) comprising a retroreflector section and means including an IFF-monitoring circuit (50) for fully activating said retroreflector section only in response to a transmitted laser beam (11) modulated at said upper frequency band with an IFF-code and for fully deactivating said retroreflector section in response to a foe laser interrogation, information sensing means (61) for sensing information at said remote location, and a retroreflector (64), amplifier (65) and liquid crystal reflector modulator means (62) arranged for modulating said lower frequency band of said laser beam (11) in response to information sensed by said information sensing means (61) at said remote location to produce said reflected beam (41) simultaneously carrying information containing signals in said lower frequency band and IFF-code signals in said higher frequency band, said semiconductor laser (23) and said liquid crystal reflector modulator means (62) requiring a low voltage, low current power supply.
1 Assignment
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Accused Products
Abstract
The present remote data monitoring system employs a laser and a modulated retroreflector for the remote data monitoring of hard to access spaces, targets etc., in combination with an arrangement for a simultaneous friend-or-foe identification, and in combination with devices for the protection against detection and against interrogation of a friend by an enemy laser. In this system, a liquid crystal modulator of special construction depending on the purpose and structure of the system, is arranged in front of a retroreflector and modulated by the respective information. The information is interrogated by a spatially distant laser station by directing a laser beam onto the retromodulator, whereby the information is retroreflected and simultaneously modulated.
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Citations
30 Claims
- 1. A remote data monitoring system for interrogating information from a remote interrogated location, comprising laser transmitter-receiver means (10) at an interrogating location, to transmit a laser beam (11) comprising upper and lower frequency bands, and retroreflector means (40) at said remote interrogated location, said laser transmitter-receiver means (10) comprising a laser transmitter section (20) including laser transmitter means (23, 24, 25, 26) including a semiconductor laser (23) and wavelength stabilizing means as part of said semiconductor laser (23) for stabilizing the wavelength of said semiconductor laser (23) and an IFF-code generator means (21) operatively connected to said laser transmitter means for modulating said upper frequency band onto said laser beam (11) transmitted by said laser transmitter means (23, 24, 25, 26), said laser transmitter-receiver means further comprising a laser receiver section (30) for receiving a reflected beam (41) comprising upper and lower frequency bands, said receiver section (30) including laser receiver means (31, 32, 33, 34, 35), an IFF-code demodulator (37) and first control means (12) connected to said IFF-code demodulator (37) and to said laser transmitter means for controlling the laser transmitter means in accordance with received information, said laser receiver section (30) further comprising transducer means (38) connected to said IFF-code demodulator (37) for providing an information output, said retroreflector means (40) comprising a retroreflector section and means including an IFF-monitoring circuit (50) for fully activating said retroreflector section only in response to a transmitted laser beam (11) modulated at said upper frequency band with an IFF-code and for fully deactivating said retroreflector section in response to a foe laser interrogation, information sensing means (61) for sensing information at said remote location, and a retroreflector (64), amplifier (65) and liquid crystal reflector modulator means (62) arranged for modulating said lower frequency band of said laser beam (11) in response to information sensed by said information sensing means (61) at said remote location to produce said reflected beam (41) simultaneously carrying information containing signals in said lower frequency band and IFF-code signals in said higher frequency band, said semiconductor laser (23) and said liquid crystal reflector modulator means (62) requiring a low voltage, low current power supply.
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26. A remote data monitoring system for interrogating information from a remote interrogated location, comprising laser transmitter-receiver means (10) at an interrogating location and retroreflector means (40) at said remote interrogated location, said laser transmitter-receiver means (10) comprising a laser transmitter section (20) including laser transmitter means (23, 24, 25, 26) including a semiconductor laser (23) and wavelength stabilizing means as part of said semiconductor laser (23) for stabilizing the wavelength of said semiconductor laser (23) and an IFF-code generator means (21) operatively connected to said laser transmitter means for modulating a laser beam (11) transmitted by said laser transmitter means (23, 24, 25, 26), said laser transmitter-receiver means further comprising a laser receiver section (30) including laser receiver means (31, 32, 33, 34, 35), an IFF-code demodulator (37) and first control means (12) connected to said IFF-code demodulator (37) and to said laser transmitter means for controlling the laser transmitter means in accordance with received information, said laser receiver section (30) further comprising transducer means (38) connected to said IFF-code demodulator (37) for providing an information output, said retroreflector means (40) comprising a retroreflector section and means including an IFF-monitoring circuit for fully activating said retroreflector section only in response to a transmitted laser beam (11) modulated with an IFF-code and for fully deactivating said retroreflector section in response to a foe laser interrogation, information sensing means (61) for sensing information at said remote location, a retroreflector (64), and liquid crystal reflector modulator means (62) arranged for modulating a reflected beam (41) in response to information sensed by said information sensing means (61) at said remote location, said semiconductor laser (23) and said liquid crystal reflector modulator means (62) requiring a low voltage, low current power supply, said IFF-monitoring circuit for fully activating said retroreflector section comprising a laser receiver (51), an interference filter (52) connected to an input of said laser receiver (51), said interference filter (52) having a narrow band corresponding to a wavelength band of said laser transmitter means, reception optics (53) cooperating with said interference filter (52), a photo-detector (54) connected to said reception optics, an amplifier (55) connected to said photo-detector (54), and an IFF-code filter (56) connected to said amplifier (55), said activating means including further control means (42) connected with one input to said IFF-code filter (56) for monitoring the output of said IFF-code filter (56) and for activating the retroreflector section (60) including said information sensing means, amplifier means (65) and said reflector modulator means (62) in the form of said liquid crystal reflector modulator means, in response to a signal received by said IFF-monitoring circuit.
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27. A remote data monitoring system for interrogating information from a remote interrogated location, comprising laser transmitter-receiver means (10) at an interrogating location and retroreflector means (40 at said remote interrogated location, said laser transmitter-receiver means (10) comprising a laser transmitter section (20) including laser transmitter means (23, 24, 25, 26) including a semiconductor laser (23) and wavelength stabilizing means as part of said semiconductor laser (23) for stabilizing the wavelength of said semiconductor laser (23) and an IFF-code generator means (21) operatively connected to said laser transmitter means for modulating a laser beam (11) transmitted by said laser transmitter means (23, 24, 25, 26), said laser transmitter-receiver means further comprising a laser receiver section (30) including laser receiver means (31, 32, 33, 34, 35), an IFF-code demodulator (37) and first control means (12) connected to said IFF-code demodulator (37) and to said laser transmitter means for controlling the laser transmitter means in accordance with received information, said laser receiver section (30) further comprising transducer means (38) connected to said IFF-code demodulator (37) for providing an information output, said retroreflector means (40) comprising a retroreflector section and means including an IFF-monitoring circuit for fully activating said retroreflector section only in response to a transmitted laser beam (11) modulated with an IFF-code and for fully deactivating said retroreflector section in response to a foe laser interrogation, information sensing means (61) for sensing information at said remote location, a retroreflector (64), and liquid crystal reflector modulator means (62) arranged for modulating a reflected beam (41) in response to information sensed by said information sensing means (61) at said remote location for simultaneously transmitting information containing signals and IFF-code modulated signals, said semiconductor laser (23) and said liquid crystal reflector modulator means (62) requiring a low voltage, low current power supply, wherein said liquid crystal reflector modulator means (62) comprise a liquid crystal mixture, said system further comprising means for modulating the drive or activation voltage for said liquid crystal mixture in said liquid crystal modulator, said liquid crystal mixture exhibiting a two frequency characteristic, said modulator means performing an amplitude modulation or performing a frequency modulation of said drive or activation voltage at different times.
- 28. A remote data monitoring system for interrogating information from a remote interrogated location, comprising laser transmitter-receiver means (10) at an interrogating location and retroreflector means (40) at said remote interrogated location, said laser transmitter-receiver means (10) comprising a laser transmitter section (20) including laser transmitter means (23, 24, 25, 26) including a semiconductor laser (23) and wavelength stabilizing means as part of said semiconductor laser (23) for stabilizing the wavelength of said semiconductor laser (23) and an IFF-code generator means (21) operatively connected to said laser transmitter means for modulating a laser beam (11) transmitted by said laser transmitter means (23, 24, 25, 26), said laser transmitter-receiver means further comprising a laser receiver section (30) including laser receiver means (31, 32, 33, 34, 35), an IFF-code demodulator (37) and first control means (12) connected to said IFF-code demodulator (37) and to said laser transmitter means for controlling the laser transmitter means in accordance with received information, said laser receiver section (30) further comprising transducer means (38) connected to said IFF-code demodulator (37) for providing an information output, said retroreflector means (40) comprising a retroreflector section and means including an IFF-monitoring circuit for fully activating said retroreflector section only in response to a transmitted laser beam (11) modulated with an IFF-code and for fully deactivating said retroreflector section in response to a foe laser interrogation, information sensing means (61) for sensing information at said remote location, a retroreflector (64), and liquid crystal reflector modulator means (62) arranged for modulating a reflected beam (41) in respone to information sensed by said information sensing means (61) at said remote location for simultaneously transmitting information containing signals and IFF-code modulated signals, said semiconductor laser (23) and said liquid crystal reflector modulator means (62) requiring a low voltage, low current power supply, and further comprising a target acquisition and tracking arrangement (24) including zoom transmission optics (25) and a beam control member (26), when during a target acquisition phase, said control means (12) control said zoom transmission optics (25) of said target acquisition and tracking arrangement (24) for setting the transmitted laser beam (11) to a large divergence, for said first control means (12) also controlling said beam control member (26) for performing a search mode, in which the transmitted laser beam (11) is scanning a predetermined space sector, and wherein after the first detection of a reflected laser beam (41), said control means (12) initiates a target tracking phase by setting said zoom transmission optics (25) to the smallest possible divergence of the transmitted laser beam (11) and by controlling said beam control member (26) for maximizing the intensity of the reflected laser geam (41).
Specification