US4079246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical communications forwards scatter compensator
Assignee: Lockheed Martin Corp
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Filing: 1976-09-08
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Granted: 1978-03-14
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Expires: 1996-09-08
Abstract
Abstract Pulse stretching and smearing due to forward scatter of a collimated beam from a light source is eliminated by the use of a multiple field of view detector which divides up the beam in the vicinity of the receiver into segments along the optical path of the beam, inverts the order of the signals from the segments, and delays the signals by predetermined amounts such that pulses from different segments overlap and add, with the delay set to compensate for different path lengths between the transmitter and the receiver due to the intercepting of various segments along the optical path by the fields of view of the individual detectors making up the multiple field of view receiver.
Inventors
- 👤 Victor A. Misek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:40
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
149 words
An optical forwards scatter communications system which provides pulse elongation compensation comprising: means at one location for projecting a single optical beam modulated in accordance with intelligence to be transmitted in a predetermined direction, and means at another location for optically defining successive sections along said single beam, and for detecting signals scattered towards said receiver means by said different sections, for inverting the order of said signals to provide a series of signals inverted in time of arrival with respect to the original times of arrival at said detecting means, for delaying one signal in said series with respect to the next succeeding signal by an amount which compensates for the pathlength difference between the path from said projecting means to said receiver means via the different corresponding successive beam sections, and for adding the delayed signal and said next succeeding signals together to obtain a composite signal.
Claim 2
Dependent Claim
149 words
An optical forwards scatter communications system which provides pulse elongation compensation comprising: means at one location for projecting a single optical beam modulated in accordance with intelligence to be transmitted in a predetermined direction, and means at another location for optically defining successive sections along said single beam, and for detecting signals scattered towards said receiver means by said different sections, for inverting the order of said signals to provide a series of signals inverted in time of arrival with respect to the original times of arrival at said detecting means, for delaying one signal in said series with respect to the next succeeding signal by an amount which compensates for the pathlength difference between the path from said projecting means to said receiver means via the different corresponding successive beam sections, and for adding the delayed signal and said next succeeding signals together to obtain a composite signal.
Claim 3
Dependent Claim
51 words
The system of claim 1 wherein said detecting means includes a segmented detector with said segments arranged in said predetermined direction and wherein said inverting means includes means for focusing said successive sections of said beam onto said segmented detector, thereby to provide said receiver means with multiple fields of view.
Claim 4
Dependent Claim
35 words
The system of claim 1 wherein each of said segments produces an output signal for light focused thereon by said focusing means and wherein said delay and adding means includes a tapped electrical delay line.
Claim 5
Dependent Claim
25 words
The system of claim 3 wherein said tapped electrical delay line includes segments of coaxial cable, the length of which determines the delay between taps.
Claim 6
Dependent Claim
41 words
The system of claim 1 wherein said delay means includes serially connected serial analog delay units, and clock means for each of said units, the frequency of said clock means determining the delay associated with a corresponding serial analog delay unit.
Claim 7
Dependent Claim
46 words
The system of claim 1 wherein said segmented detector includes a number of light pipes, and detectors at the ends of the light pipes, with the other ends of the light pipes being arranged in said predetermined direction at the focal plane of said focusing means.
Claim 8
Dependent Claim
113 words
An optical forward scatter communications system which provides pulse elongation compensation, comprising: means at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, means at another location for detecting signals scattered from different successive sections along said beam and for inverting their order to provide series of signals inverted in time of arrival with respect to their original times of arrival at said detecting means, and, means for delaying a preceding signal in said series with respect to a next succeeding signal by amounts which cause the signals in said series to coherently add, and for adding the coherently addable signals together to obtain a composite signal.
Claim 9
Dependent Claim
113 words
An optical forward scatter communications system which provides pulse elongation compensation, comprising: means at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, means at another location for detecting signals scattered from different successive sections along said beam and for inverting their order to provide series of signals inverted in time of arrival with respect to their original times of arrival at said detecting means, and, means for delaying a preceding signal in said series with respect to a next succeeding signal by amounts which cause the signals in said series to coherently add, and for adding the coherently addable signals together to obtain a composite signal.
Claim 10
Dependent Claim
105 words
An optical forward scatter communications system which provides pulse elongation compensation, comprising: means at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, means at another location for detecting signals scattered from different successive sections along said beam and for inverting their order to provide a series of signals inverted in time of arrival with respect to their original times of arrival at said detecting means, and, means for delaying a preceding signal in said series so that it coincides in time with the next succeeding signal and for adding said time coincident signals to obtain a composite signal.
Claim 11
Dependent Claim
105 words
An optical forward scatter communications system which provides pulse elongation compensation, comprising: means at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, means at another location for detecting signals scattered from different successive sections along said beam and for inverting their order to provide a series of signals inverted in time of arrival with respect to their original times of arrival at said detecting means, and, means for delaying a preceding signal in said series so that it coincides in time with the next succeeding signal and for adding said time coincident signals to obtain a composite signal.
Claim 12
Independent Claim
129 words
A method for compensating for multi-path distortion in an optical forward scatter system utilizing the projection of a beam in a predetermined direction through the earth's atmosphere from one location and a receiver at another location for detecting radiation scattered from said beam to said receiver comprising the steps of: providing an inverse optical path at said receiver for radiation scattered thereto from said beam, delaying signals at various successive sections along said inverse optical path with respect to next succeeding sections by amounts which cause signals in adjacent sections to coherently add, and adding said coherently addable signals, whereby path length differences from the projection location to the reception location due to scattering from different points along the beam are compensated for by the delay and coherent addition.
Claim 13
Independent Claim
129 words
A method for compensating for multi-path distortion in an optical forward scatter system utilizing the projection of a beam in a predetermined direction through the earth's atmosphere from one location and a receiver at another location for detecting radiation scattered from said beam to said receiver comprising the steps of: providing an inverse optical path at said receiver for radiation scattered thereto from said beam, delaying signals at various successive sections along said inverse optical path with respect to next succeeding sections by amounts which cause signals in adjacent sections to coherently add, and adding said coherently addable signals, whereby path length differences from the projection location to the reception location due to scattering from different points along the beam are compensated for by the delay and coherent addition.
Claim 14
Independent Claim
96 words
A method for providing multi-path distortion compensation for an optical forward scatter communications system in which means are provided at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, comprising the steps of: detecting signals scattered from different successive sections along said beam at another location, and inverting their order to provide series of signals inverted in time of arrival, and, delaying a preceding signal in said series so that it coincides in time with the next succeeding signal and adding the time coincident signals to obtain a composite signal.
Claim 15
Independent Claim
96 words
A method for providing multi-path distortion compensation for an optical forward scatter communications system in which means are provided at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, comprising the steps of: detecting signals scattered from different successive sections along said beam at another location, and inverting their order to provide series of signals inverted in time of arrival, and, delaying a preceding signal in said series so that it coincides in time with the next succeeding signal and adding the time coincident signals to obtain a composite signal.
Claim 16
Dependent Claim
96 words
Apparatus for providing multi-path distortion compensation for an optical forward scatter communications system in which means are provided at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, comprising; means for detecting signals scattered from different successive sections along said beam at another location, and inverting their order to provide series of signals inverted in time of arrival, and, means for delaying a preceding signal in said series so that it coincides in time with the next succeeding signal and adding the time coincident signals to obtain a composite signal.
Claim 17
Dependent Claim
96 words
Apparatus for providing multi-path distortion compensation for an optical forward scatter communications system in which means are provided at one location for projecting an optical beam modulated in accordance with intelligence to be transmitted, comprising; means for detecting signals scattered from different successive sections along said beam at another location, and inverting their order to provide series of signals inverted in time of arrival, and, means for delaying a preceding signal in said series so that it coincides in time with the next succeeding signal and adding the time coincident signals to obtain a composite signal.
References Cited (Backward Citations)
US3681695A
Cited
US3731103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |