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Theoretical and Experimental Determination of the Near‐Field Correction for Backscatter Gain at the Arecibo Observatory
Author(s) -
Steinfeld A. H.,
Brice N. M.,
Conrad J. C.,
LaLonde L. M.
Publication year - 1971
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs006i012p01079
Subject(s) - backscatter (email) , optics , feed horn , reflector (photography) , radar , physics , incoherent scatter , remote sensing , line (geometry) , geology , scattering , antenna (radio) , radiation pattern , periscope antenna , mathematics , telecommunications , computer science , wireless , light source , geometry
During the summer of 1968, two‐beam, incoherent‐scatter radar measurements were made at Arecibo. The two beams were formed by two separate feeds for the Arecibo reflector, one a line feed which illuminated essentially all of the reflector, and the other a horn feed which effectively illuminated about 500 feet of the reflector. A by‐product of this experiment was the calibration of the near‐field correction to the backscatter gain of the line‐feed system. This was obtained by comparing the power received as a function of range in the two radar systems. The measured loss of gain in the near field for the line feed was about 1.5 db at a height of 100 km.