US3430239A
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Doppler inertial system with accurate vertical reference
Assignee: General Precision Systems Inc
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Filing: 1967-07-19
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Granted: 1969-02-25
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Expires: 1987-07-19
Abstract
No abstract record available.
Inventors
- 👤 Heinz Buell
- 👤 John M Fiore
- 👤 Louis S Marino
- 👤 Jack Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:54
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/10; G01C21/12; G01C21/16; G01C21/183; G01C21/188; G01C21/165; G01C21/1652
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
ELECTRICAL COMPENSATION FOR LEVELING ERRORS OF TABLE 14 ABOUT THE NORTH AXIS IS PROVIDED BY THE COMPENSATING CIRCUIT 104, THE OPERATION OF WHICH IS TUNED AND DAMPED BY A DOPPLER VELOCITY SIGNAL VDE. VERY ACCURATE VERTICAL REFERENCE SIGNALS ARE PROVIDED AT A LOCATION REMOTE FROM THE HEADING REFERENCE SYSTEM OF FIG. 1, DESPITE AIRFRAME FLEXTURE, BY THE VERTICAL REFERENCE SYSTEM OF FIG. 2. THE FIG.2 SYSTEM INCLUDES AN INERTIALLY STABILIZED TABLE 126 AND ASSOCIATED STABILIZATION CIRCUITS 162 AND 164, THE OPERATION OF EACH OF WHICH IS CORRECTED AND DAMPED BY DOPPLER VELOCITY SIGNALS OBTAINED FROM THE DOPPLER RADAR 48 OF FIG. 1.
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |