US5132686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forward looking radar
Assignee: Deutsches Zentrum für Luft- und Raumfahrt eV
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Filing: 1991-03-07
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Granted: 1992-07-21
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Expires: 2011-03-07
Abstract
Abstract In a forward looking radar in which from flying or stationary carriers land or marine surfaces in a forward lying sector region are imaged two-dimensionally, an antenna mounted rigidly on a carrier is made up of a plurality of individual elements preferably in the form of horn antennas arranged rectilinearly in a row adjacent each other in such a manner that for a predetermined aperture length l of each individual element and for a predetermined spacing of the individual elements the antenna has an antenna length L=nxl. The transmission is incoherent from a single element and thereafter simultaneous reception is effected with the remaining individual elements. To implement a digital coupling of the individual elements each said element is evaluated separately digitally and by correlation of a specific predetermined reference function a digital processing is carried out for each angular region.
Inventors
- 👤 Franz Witte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:02
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/89; G01S7/00; G01S7/02; G01S7/03; H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; H01Q3/00; H01Q3/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
A forward looking radar for two-dimensional imaging of land or marine surfaces including objects detectable there in a forward lying sector region of flying or stationary carriers, wherein an antenna (1) mounted rigidly on a carrier is made up of a plurality (n) of rectilinearly adjacently disposed individual elements (10) in such a manner that for a predetermined aperture length (l) of each individual element (10) and for a predetermined distance (Δx with Δx=1) the antenna (1) has an antenna length (L) of L=n·l, whereby incoherent transmission is effected by an individual element (10) and thereafter with known phase position of the individual elements (10) with respect to each other simultaneous reception effected with all the other individual elements (10), to implement a digital coupling of the individual elements each individual element (10) is separately evaluated digitally and a digital processing is carried out by correlation of a specific predetermined reference function (R(x)) for each angular region.
Claim 2
Dependent Claim
157 words
A forward looking radar for two-dimensional imaging of land or marine surfaces including objects detectable there in a forward lying sector region of flying or stationary carriers, wherein an antenna (1) mounted rigidly on a carrier is made up of a plurality (n) of rectilinearly adjacently disposed individual elements (10) in such a manner that for a predetermined aperture length (l) of each individual element (10) and for a predetermined distance (Δx with Δx=1) the antenna (1) has an antenna length (L) of L=n·l, whereby incoherent transmission is effected by an individual element (10) and thereafter with known phase position of the individual elements (10) with respect to each other simultaneous reception effected with all the other individual elements (10), to implement a digital coupling of the individual elements each individual element (10) is separately evaluated digitally and a digital processing is carried out by correlation of a specific predetermined reference function (R(x)) for each angular region.
Claim 3
Dependent Claim
30 words
A forward looking radar according to claim 1, wherein the plurality (n) of individual elements (10) are configured as horn antennas and arranged in one row rectilinearly adjacent each other.
Claim 4
Dependent Claim
153 words
A forward looking radar for two-dimensional imaging of land or marine surfaces including objects detectable in a forward lying sector region of flying or stationary carriers, comprising an antenna (1) mounted rigidly on a carrier formed of a plurality (n) of rectilinearly adjacently disposed individual elements (10) in such a manner that for a predetermined aperture length (l) of each individual element (10) and for a predetermined distance (Δx with Δx=1), the antenna (1) has an antenna length (L) of L=n·l, means for effecting incoherent transmission by an individual element (10) and thereafter with known phase position of said individual elements (10) with respect to each other to effect simultaneous reception with all said individual elements (1), means for separately digitally evaluating each individual element (10) to implement a digital coupling of said individual elements, and means for correlating a specific predetermined reference function (R(x)) for each angular region to effect digital processing.
Claim 5
Dependent Claim
153 words
A forward looking radar for two-dimensional imaging of land or marine surfaces including objects detectable in a forward lying sector region of flying or stationary carriers, comprising an antenna (1) mounted rigidly on a carrier formed of a plurality (n) of rectilinearly adjacently disposed individual elements (10) in such a manner that for a predetermined aperture length (l) of each individual element (10) and for a predetermined distance (Δx with Δx=1), the antenna (1) has an antenna length (L) of L=n·l, means for effecting incoherent transmission by an individual element (10) and thereafter with known phase position of said individual elements (10) with respect to each other to effect simultaneous reception with all said individual elements (1), means for separately digitally evaluating each individual element (10) to implement a digital coupling of said individual elements, and means for correlating a specific predetermined reference function (R(x)) for each angular region to effect digital processing.
References Cited (Backward Citations)
US4675677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |