Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-05-06
1987-08-18
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
33320, 358103, 358107, 358140, 358160, 382 45, H06N 701
Patent
active
046880925
ABSTRACT:
Pixels within a satellite camera (1, 2) image are precisely located in terms of latitude and longitude on a celestial body, such as the earth, being imaged. A computer (60) on the earth generates models (40, 50) of the satellite's orbit and attitude, respectively. The orbit model (40) is generated from measurements of stars and landmarks taken by the camera (1, 2), and by range data. The orbit model (40) is an expression of the satellite's latitude and longitude at the subsatellite point, and of the altitude of the satellite, as a function of time, using as coefficients (K) the six Keplerian elements at epoch. The attitude model (50) is based upon star measurements taken by each camera (1, 2). The attitude model (50) is a set of expressions for the deviations in a set of mutually orthogonal reference optical axes (x, y, z) as a function of time, for each camera (1, 2). Measured data is fit into the models (40, 50) using a walking least squares fit algorithm. A transformation computer (66 ) transforms pixel coordinates as telemetered by the camera (1, 2) into earth latitude and longitude coordinates, using the orbit and attitude models (40, 50).
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Graul Donald W.
Hanson Charles W.
Kamel Ahmed A.
Savides John
Britton Howard W.
Ford Aerospace & Communications Corporation
Radlo Edward J.
Zerschling Keith L.
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