Accession Number:

AD0810909

Title:

MEASUREMENTS OF SPATIAL COHERENCE IN 3.2-MM HORIZONTAL TRANSMISSION.

Descriptive Note:

Rept. for 1 Jul 65-1 Oct 66,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA LABS DIV

Personal Author(s):

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

Report Date:

1967-01-01

Pagination or Media Count:

34.0

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

Descriptors:

• (*COHERENT RADIATION
• MILLIMETER WAVES)
• (*WAVE PROPAGATION
• MILLIMETER WAVES)
• PROPAGATION
• PHASE MEASUREMENT
• PHASE SHIFT CIRCUITS
• DIVERSITY RECEPTION
• ATMOSPHERES
• ATMOSPHERIC MOTION
• SCINTILLATION

Subject Categories:

• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE