Measurements of spatial coherence in 3.2-mm horizontal transmission

Author

Etcheverry, R. ; Heidbreder, G.R. ; Johnson, W.A. ; Wintroub, H.J.

Author_Institution

Aerospace Corporation, El Segundo, CA, USA

Volume

15

Issue

1

fYear

1967

fDate

1/1/1967 12:00:00 AM

Firstpage

136

Lastpage

141

Abstract

An experiment designed to measure wavefront statistics in 3.2-mm wavelength horizontal transmission over an 18.95-km path is described. A frequency-stabilized signal is transmitted over the path and is received in two spaced antennas having variable separation. The receivers are instrumented to measure phase difference and amplitude fluctuations. A simultaneous beam-swinging experiment using a precision-controlled 4.57-m antenna colocated with the phase difference receivers provides data on wavefront tilt fluctuations. Preliminary results indicate that the random wavefront tilt is the predominant atmosphere-induced wavefront phase disturbance. They further suggest that spatial coherence of wavefronts is of sufficient extent that apertures in excess of 7 m in diameter are feasible at the 3.2-mm wavelength.

Keywords

Beam steering; Correlations; Radio propagation meteorological factors; Antenna measurements; Atmospheric measurements; Fluctuations; Frequency; Instruments; Receiving antennas; Spatial coherence; Statistics; Transmitting antennas; Wavelength measurement;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1967.1138848

Filename

1138848