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Coherence Properties of a 9‐Gigahertz Propagation Path Near the Ground
Author(s) -
d' Auria Giovanni,
Solimini Domenico
Publication year - 1970
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/rs005i012p01387
Subject(s) - degree of coherence , interferometry , coherence (philosophical gambling strategy) , optics , coherence time , coherence length , interference (communication) , degree (music) , physics , optical path length , antenna (radio) , computer science , acoustics , telecommunications , channel (broadcasting) , superconductivity , quantum mechanics
Spatial statistical properties of a 39‐km X ‐band propagation path developing near the ground have been investigated by means of the degree of coherence, which has been measured systematically over 3 months in the fall of 1968. A direct method of measurement has been worked out and has proved to be convenient in many respects. The method is based on the repeated plotting of the interference patterns obtained by a phase scanned interferometer. The measurements of the degree of coherence refer to three pairs of antennas that were permanently on site and were cyclically switched on the circuit of the interferometer. Results on the behavior of the degree of coherence with the time of day and with the progression of the autumnal season are reported. Distribution curves for the degree of coherence of the three pairs of antennas are also given. A practical use of the study is the appreciation of the gain deterioration of large antenna systems operating near the ground. This method may also be a novel approach to the electromagnetic probing of the atmosphere.