US3902175A
Expired / Lapsed
US
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Method and apparatus for phase integration of radar pulse trains
Assignee: Siemens AG
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Filing: 1972-10-13
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Granted: 1975-08-26
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Expires: 1992-10-13
Abstract
Abstract A method and apparatus for detecting weak signals in the presence of noise wherein a repetitive radar signal is integrated over a relatively long time such that the intelligence in the echo signal gradually builds up in a memory and which can then be read out to recover the intelligence. In one embodiment photochromium memories are used which supply an output to an analog computer and in a second embodiment the storage medium is a polarization rotating crystal as for example a KDP crystal.
Inventors
- 👤 Gerhard Winzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:50
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G01S7/2923; G01S7/2926
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
The method of reducing noise in radar echo pulses by in-phase integration of echo pulses which are produced during multiple sensing of radar targets comprising the steps of a. separating said echo pulses into positive and negative amplitude signals, b. storing the squares of said positive amplitude signals in a first two dimensional reversible intermediate optical carrier material memory, c. storing the squares of said negative amplitude signals in a second two dimensional reversible intermediate optical carrier material memory, d. transforming by Fourier transforms the contents of said first and second memories by an optical analogue computer and wherein the echo pulses of a given number of sensing processes are added in said first and second memories and said first and second memories convert said echo pulses into position functions by making a coordinate transformation wherein the amplitude distribution is represented by a spatial distribution.
Claim 2
Independent Claim
145 words
The method of reducing noise in radar echo pulses by in-phase integration of echo pulses which are produced during multiple sensing of radar targets comprising the steps of a. separating said echo pulses into positive and negative amplitude signals, b. storing the squares of said positive amplitude signals in a first two dimensional reversible intermediate optical carrier material memory, c. storing the squares of said negative amplitude signals in a second two dimensional reversible intermediate optical carrier material memory, d. transforming by Fourier transforms the contents of said first and second memories by an optical analogue computer and wherein the echo pulses of a given number of sensing processes are added in said first and second memories and said first and second memories convert said echo pulses into position functions by making a coordinate transformation wherein the amplitude distribution is represented by a spatial distribution.
Claim 3
Dependent Claim
23 words
The method according to claim 1 wherein said transforming by Fourier transforms of the position function is effected by a space frequency analyzer.
Claim 4
Dependent Claim
16 words
The method according to claim 2, wherein said optical intermediate multi-channel memory is, a photochrome film.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said optical analogue computer is a joint optical space frequency analyzer.
Claim 6
Dependent Claim
33 words
The method according to claim 1, wherein the position function is applied as a charge profile on a polarization-rotated crystal and said charge profile is scanned with a linearly polarized coherent light beam.
Claim 7
Dependent Claim
16 words
The method according to claim 1, wherein optical intermediate multi-channel memories, a polarization-rotated crystal is used.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |