Accession Number : AD0430349


Title :   PROJECT FLAYER III A STUDY OF SPREAD-F ECHOES FROM THE IONOSPHERE.


Descriptive Note : Final rept.,


Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y


Personal Author(s) : Renau,Jacques ; Flood,W A


Report Date : Aug 1963


Pagination or Media Count : 48


Abstract : Forty-four cases of Spread-F echoes at 2.4 Mcs were analyzed and the following conclusions were drawn: 1. The width of the video fading spectrum is commonly less than 1/2 cps although occasionally some of the spectra are as wide as 1 cps with much weaker components at 2 cps. 2. The amplitude distribution of Spread-F echoes at 2.4 Mcs obtained from one minute data runs are Rayleigh or Rice distributed only for the strongest and lower altitude echoes. The echoes from the largest slant ranges (and presumably higher altitudes) are neither Rayleigh nor Rice distributed, and they show an unexpectedly large proportion of small or zero amplitude signals, a situation which suggests a sporadic nature of Spread-F echoes. 3. The amplitude correlation coefficient evaluated at a 1700 foot ( 4 wavelength) spacing is typically much less than 0.4 implying that the cone angle of Spread-F echoes is commonly greater than 5 degrees. It is clear, then, that Spread-F echoes are associated with a greater degree of spread of angle of arrival (cone angle) than are echoes from the normal Fregion. (Author)


Descriptors :   *IONOSPHERIC PROPAGATION , RADIO WAVES , REFLECTION , DETECTION , BANDWIDTH , ANGLE OF ARRIVAL , MEASURING INSTRUMENTS


Distribution Statement : APPROVED FOR PUBLIC RELEASE