Computer Science – Performance
Scientific paper
Oct 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958natur.182.1008w&link_type=abstract
Nature, Volume 182, Issue 4641, pp. 1008-1010 (1958).
Computer Science
Performance
1
Scientific paper
EXISTING instruments for making precise trajectory observations on artificial Earth satellites generally employ photographic techniques, a good example being the Schmidt-Baker-Nunn cameras of the Smithsonian Astrophysical Observatory. Since the launching of Sputnik 2, we have been experimenting with optical tracking by a photo-electric method which appears capable of adequate sensitivity and a precision comparable with that of astronomical observations, and thus high enough for observing the non-secular perturbations of a satellite orbit. The principal advantage of the method is the simpler design of the optical system since a long focal length can be used, unlike the photographic method where a short-focus lens is required. The correction of lens aberrations is thereby rendered much easier. A performance in many ways comparable with the Schmidt-Baker-Nunn camera has been obtained with a lens having a 5-in. diameter aperture and 14-in. focal length.
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