US4514733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for aircraft
Assignee: Vereinigte Flugtechnische Werke GmbH
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Filing: 1982-02-19
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Granted: 1985-04-30
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Expires: 2002-02-19
Abstract
Abstract A terrain-contour-matching guidance method is disclosed in which topographic reference data are made to include the same systematic errors which altitude measurement of an unmanned flight is expected to produce. Speed/course and general flight path tracking is operated on a higher resolution.
Inventors
- 👤 Hubertus Schmidtlein
- 👤 Horst-Dieter Lerche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:05
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/005; F; F41; F41G; F41G7/00; F41G7/34; F41G7/343; G05; G05D; G05D1/00; G05D1/10; G05D1/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A method of automatically navigating an aircraft across a particular territory on the basis of topographical reference data to be compared with actual topographical data acquired by the aircraft during overflight across the particular territory, comprising the steps of: acquiring prior to said overflight topographic reference data under conditions which include systematic errors introduced by a specific altitute measuring device, the reference data used are regular topographic data, and the systematic errors are introduced by providing terrain-specific corrective data by means of said specific altitude-measuring device; acquiring the actual topographic position data under utilization of the same type of specific altitude-measuring device which introduces similar errors; and using these reference data together with the topographic position data to obtain said comparison, including correcting the reference data by introducing systematic errors on the basis of the corrective data.
Claim 2
Independent Claim
137 words
A method of automatically navigating an aircraft across a particular territory on the basis of topographical reference data to be compared with actual topographical data acquired by the aircraft during overflight across the particular territory, comprising the steps of: acquiring prior to said overflight topographic reference data under conditions which include systematic errors introduced by a specific altitute measuring device, the reference data used are regular topographic data, and the systematic errors are introduced by providing terrain-specific corrective data by means of said specific altitude-measuring device; acquiring the actual topographic position data under utilization of the same type of specific altitude-measuring device which introduces similar errors; and using these reference data together with the topographic position data to obtain said comparison, including correcting the reference data by introducing systematic errors on the basis of the corrective data.
References Cited (Backward Citations)
US3805261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |