Accession Number : AD0682472

Title :   COMPARISON OF SIMULTANEOUS LINE-OF-SIGHT SIGNALS AT 9.6 AND 34.52 GHZ.

Descriptive Note : Technical memo.,

Corporate Author : INSTITUTE FOR TELECOMMUNICATION SCIENCES BOULDER COLO

Personal Author(s) : Janes,H. B. ; Thompson,M. C. , Jr. ; Smith,D. ; Kirkpatrick,A. W.

Report Date : DEC 1968

Pagination or Media Count : 33

Abstract : Signals at 9.6 and 34.52 GHz, propagated simultaneously over a slant, line-of-sight, overwater path, were analyzed to compare the power spectra of phase-of-arrival variations and fading and to determine the coherence of these signals with regard to both phase variations and fading. The phase data at the two radio frequencies exhibited nearly identical power spectra from 0.01 to 5 Hz and very high coherence from 0.01 to 0.1 Hz. The coherence dropped rapidly above 0.1 Hz and was in most cases less than 0.4 above 0.5 Hz. The power spectra of fading were similar in shape at the two frequencies, but the fading spectral density was consistently higher at 34.52 GHz than at 9.6 GHz from 0.1 to 5 Hz. The shape of the coherence function for fading was similar to that of the corresponding phase coherence function, but the fading coherence was lower at the low spectral frequencies. The possible effect of the small spatial separation of the propagation paths on the coherence analysis is discussed. (Author)

Descriptors :   (*PROPAGATION, *MICROWAVES), MILLIMETER WAVES, X BAND, K BAND, POWER SPECTRA, ATTENUATION, PHASE MEASUREMENT, COHERENT SCATTERING, RADIO WAVES

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE