US5204818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surveying satellite apparatus
Assignee: United States Department of the Air Force
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Filing: 1992-05-07
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Granted: 1993-04-20
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Expires: 2012-05-07
Abstract
Abstract A surveying satellite apparatus having an on-board microprocessor to process sensor-provided data from planetary and/or celestial reference scene. The sensor data is compared with the on-board spacecraft database to determine if any misorientation or translation error is present. The spacecraft attitude and ephemeris solutions are autonomously updated to reflect the realtime alignment.
Inventors
- 👤 Peter B. Landecker
- 👤 Richard C. Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:14
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/78; G01S3/782; G01S3/785; G01S3/786; B; B64; B64G; B64G1/00; B64G1/22; B64G1/24; B64G1/36; B64G1/361; B64G1/365; B64G3/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
210 words
A surveying satellite apparatus with an on-board attitude and ephemeris solution microprocessor comprising in combination: means for sensing at least one optical signal from a reference point, said sensing means providing a reference signal corresponding to each optical signal, means for detecting and converting each reference signal to an electrical signal, means for processing said electrical signals, said means for processing signals including a database, said database containing the characteristics of navigation references, said means for processing signals correlating said electrical signals to location prediction data to establish a frame of reference, said means for processing signals comparing said electrical signals with said frame of reference to establish attitude difference signals, said attitude difference signals are utilized by said means for processing signals to update attitude data of the satellite, and, means for establishing a grid database, said grid database means storing a grid database, said means for processing signals receiving and converting said reference signals to a visual display, said means for processing signals superimposing said grid database on said visual display to provide grid graphics, said means for processing signals applying a grid correction signal to said grid database means, said grid correction signal utilized by said means for processing signals to update ephemeris data of the satellite.
Claim 2
Dependent Claim
210 words
A surveying satellite apparatus with an on-board attitude and ephemeris solution microprocessor comprising in combination: means for sensing at least one optical signal from a reference point, said sensing means providing a reference signal corresponding to each optical signal, means for detecting and converting each reference signal to an electrical signal, means for processing said electrical signals, said means for processing signals including a database, said database containing the characteristics of navigation references, said means for processing signals correlating said electrical signals to location prediction data to establish a frame of reference, said means for processing signals comparing said electrical signals with said frame of reference to establish attitude difference signals, said attitude difference signals are utilized by said means for processing signals to update attitude data of the satellite, and, means for establishing a grid database, said grid database means storing a grid database, said means for processing signals receiving and converting said reference signals to a visual display, said means for processing signals superimposing said grid database on said visual display to provide grid graphics, said means for processing signals applying a grid correction signal to said grid database means, said grid correction signal utilized by said means for processing signals to update ephemeris data of the satellite.
Claim 3
Dependent Claim
55 words
A surveying satellite apparatus as described in claim 1 further including means for ground control, said ground control means receiving attitude difference signals from said means for processing signals, said ground control means monitoring said attitude difference signals, said ground control means including means for generating an override command using a ground computer and transmitter.
Claim 4
Dependent Claim
16 words
A surveying satellite apparatus as described in claim 1 wherein said reference point comprises city lights.
Claim 5
Dependent Claim
16 words
A surveying satellite apparatus as described in claim 1 wherein said reference point comprises a landmark.
Claim 6
Dependent Claim
36 words
A surveying satellite apparatus as described in claim 1 wherein said means for processing signals comprises a microprocessor unit to receive said attitude difference signals and to update stored attitude and ephemeris data in response thereto.
Claim 7
Dependent Claim
36 words
A surveying satellite apparatus as described in claim 1 wherein said means for sensing optical signals comprises a single optical sensor which is operated on a time-shared basis to sense a number of different reference scenes.
Claim 8
Dependent Claim
32 words
A surveying satellite apparatus as described in claim 1 wherein said means for sensing optical signals comprises a plurality of optical sensing means which are respectively dedicated to a different reference scene.
Claim 9
Dependent Claim
16 words
A surveying satellite apparatus as described in claim 1 wherein said reference point comprises a star.
References Cited (Backward Citations)
US3636330A
Cited
US3521835A
Cited
US3744740A
Cited
US3749914A
Cited
US4617634A
Cited
US4658361A
Cited
US4679753A
Cited
US4730798A
Cited
US4688091A
Cited
US4688092A
Cited
US4746976A
Cited
US4883244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |