Computer Science
Scientific paper
Jun 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960natur.186..873h&link_type=abstract
Nature, Volume 186, Issue 4728, pp. 873-874 (1960).
Computer Science
5
Scientific paper
THE early work on radar reflexions from the Moon was carried out at metre wave-lengths with long pulses or with continuous wave giving a returned signal which was the total scattering from the lunar surface. Measurements showed that apart from a long-period fading produced by Faraday rotation of the linearly polarized waves in passing through the ionosphere, the reflected signal also had a short-period amplitude modulation produced by lunar libration. If a frequency analysis is carried out on these more rapid fluctuations, the different frequency components can be related to the Doppler frequency from the various regions on the Moon1, and in this way Evans2 indicated that most of the radiation was scattered from a central part of the optical disk of a radius only one-third of the lunar radius. More recently, with radars of higher peak power and µsec. pulse-lengths, it has been possible to confirm this result by direct measurement over the wave-length range of at least 10 cm. to 1.5 m. (refs. 3-5).
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