MEASUREMENTS OF SPATIAL COHERENCE IN 3.2-MM HORIZONTAL TRANSMISSION.
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 diam are feasible at the 3.2-mm wavelength. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1967
- Accession Number
- AD0810909
Entities
People
- G. R. Heidbreder
- H. J. Wintroub
- R. D. Etcheverry
- W. A. Johnson
Organizations
- The Aerospace Corporation