US4642801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual display process for sonars
Assignee: Thales SA
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Filing: 1984-04-09
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Granted: 1987-02-10
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Expires: 2004-04-09
Abstract
Abstract A visual display process of objects identified by a classification sonar consisting of modifying the visual display cathode ray tube scan laws in order to obtain a representation which is modified according to a perspective mode where the ratio of their height to their width is constant whatever their range, or to a normalized dimension mode where identical objects of the same orientation have the same representation whatever their range.
Inventors
- 👤 Didier Perny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:21
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/52; G01S7/523; G01S7/526; G01S7/53; G01S7/531; G01S15/00; G01S15/88; G01S15/89; G01S15/8902; G01S7/56; G01S7/62; G01S7/6218
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A process for visually displaying on a cathode ray tube objects at a depth H on the sea bed, the process comprising: using a classification sonar for detecting the objects, each object having a slant range ρ and a bearing angle θ to the sonar, the sonar producing video signals and a minimum slant range ρ min for each object; using a sounder to determine the depth H; first scanning the cathode ray tube along a horizontal direction X with a plurality of successive sawtooth-shaped scan signals of constant width and constant amplitude, the scan signals providing for a constant width of visual display defined by the minimum slant range ρ min , the horizontal direction X representing the bearing angle θ of the object; simultaneously second scanning the cathode ray tube along a vertical direction Y with the relationship ##EQU8## where k is a constant of proportionality.
Claim 2
Dependent Claim
148 words
A process for visually displaying on a cathode ray tube objects at a depth H on the sea bed, the process comprising: using a classification sonar for detecting the objects, each object having a slant range ρ and a bearing angle θ to the sonar, the sonar producing video signals and a minimum slant range ρ min for each object; using a sounder to determine the depth H; first scanning the cathode ray tube along a horizontal direction X with a plurality of successive sawtooth-shaped scan signals of constant width and constant amplitude, the scan signals providing for a constant width of visual display defined by the minimum slant range ρ min , the horizontal direction X representing the bearing angle θ of the object; simultaneously second scanning the cathode ray tube along a vertical direction Y with the relationship ##EQU8## where k is a constant of proportionality.
Claim 3
Dependent Claim
155 words
A process for visually displaying on a cathode ray tube objects at a depth H on the sea bed, the processing comprising: using a classification sonar for detecting the objects, each object having a slant range ρ and a bearing angle θ to the sonar, the sonar producing video signals and a minimum slant range ρ min for each object; using a sounder to determine the depth H; first scanning the cathode ray tube along a horizontal direction X with a plurality of successive sawtooth-shaped scan signals of constant width and maximum amplitude increasing according to the relationship ##EQU9## where X 0 is a value defined by the minimum slant range ρ min , the X direction representing the bearing angle θ of the object; and simultaneously second scanning the cathode ray tube along a vertical direction Y, representing the slant range ρ, according to the relationship ##EQU10## where k is a constant of proportionality.
Claim 4
Dependent Claim
155 words
A process for visually displaying on a cathode ray tube objects at a depth H on the sea bed, the processing comprising: using a classification sonar for detecting the objects, each object having a slant range ρ and a bearing angle θ to the sonar, the sonar producing video signals and a minimum slant range ρ min for each object; using a sounder to determine the depth H; first scanning the cathode ray tube along a horizontal direction X with a plurality of successive sawtooth-shaped scan signals of constant width and maximum amplitude increasing according to the relationship ##EQU9## where X 0 is a value defined by the minimum slant range ρ min , the X direction representing the bearing angle θ of the object; and simultaneously second scanning the cathode ray tube along a vertical direction Y, representing the slant range ρ, according to the relationship ##EQU10## where k is a constant of proportionality.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |