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
358107, 358140, 358160, 358180, 382 45, H04N 701
Patent
active
046880917
ABSTRACT:
A system for achieving spacecraft camera (1, 2) image registration comprises a portion external to the spacecraft and an image motion compensation system (IMCS) portion onboard the spacecraft. Within the IMCS, a computer (38) calculates an image registration compensation signal (60) which is sent to the scan control loops (84, 88, 94, 98) of the onboard cameras (1, 2). At the location external to the spacecraft, the long-term orbital and attitude perturbations on the spacecraft are modeled. Coefficients (K, A) from this model are periodically sent to the onboard computer (38) by means of a command unit (39). The coefficients (K, A) take into account observations of stars and landmarks made by the spacecraft cameras (1, 2) themselves. The computer (38) takes as inputs the updated coefficients (K, A) plus synchronization information indicating the mirror position (AZ, EL) of each of the spacecraft cameras (1, 2), operating mode, and starting and stopping status of the scan lines generated by these cameras (1, 2), and generates in response thereto the image registration compensation signal (60). The sources of periodic thermal errors on the spacecraft are discussed. The system is checked by calculating "measurement residuals", the difference between the landmark and star locations predicted at the external location and the landmark and star locations as measured by the spacecraft cameras (1, 2).
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Chan Fred N. T.
Gamble Donald W.
Graul Donald W.
Kamel Ahmed A.
Britton Howard W.
Ford Aerospace & Communications Corporation
Radlo Edward J.
Zerschling Keith L.
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