Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aiaa.meets....e&link_type=abstract
American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting, 17th, New Orleans, La., Jan. 15-17, 1979, 11 p.
Astronomy and Astrophysics
Astronomy
Charge Coupled Devices, Guidance Sensors, Image Processing, Optical Tracking, Space Navigation, Spacecraft Guidance, Algorithms, Graphs (Charts), Optical Measuring Instruments, Photosensitivity, Radiation Measuring Instruments, Satellite-Borne Instruments, Spacecraft Trajectories, Star Trackers
Scientific paper
The optical navigation process uses spaceborne measurements of the apparent direction vector from the spacecraft to a target body, (planet, satellite, star, etc.) to improve estimates of the spacecraft trajectory. Ground-based controllers assimilate the optical measurements, together with spacecraft radio-tracking data and target ephemeris data, to generate a best estimate of the trajectory relative to the target. The present paper deals with a development program supporting the use of (solid state) CCD (Charged Coupled Device) imagers for spacecraft navigation. It is shown that stars can be detected that are two to three magnitudes fainter than with an equivalent vidicon based instrument, that effects of global response nonuniformity and dark current spikes can be essentially eliminated from the data as a result of the reproducibility of both effects, and that charge trailing during readout of star image data can lead to position measurement errors.
Alexander James W.
Eisenman Allan R.
Stanton Richard H.
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