Accession Number : AD0431197

Title :   ANTI-JAM TROPOSPHERIC SCATTER THEORETICAL ANALYSIS.

Descriptive Note : Final rept.

Corporate Author : ITT COMMUNICATION SYSTEMS INC PARAMUS N J

Report Date : 15 JUN 1963

Pagination or Media Count : 133

Abstract : A theoretical investigation of the effect of radar chaff on the communication performance of tropospheric scatter communication systems using FDMFM is presented. The characterization of a troposcatter transmission medium with chaff superimposed is discussed. It is shown that the essential information needed to predict the be havior of this composite medium is contained in a certain function sigma (x) called the Scattering Power Distribution. A detailed discussion is presented of the effects of dropping chaff in the common scattering volume of a troposcatter communication system employing FDM-FM. It is shown how the intermodulation distortion can be minimized by leaving out portions of the transmitted baseband spectrum. Analytical results on the intermodulation distortion produced in an FDM-FM system by the frequency selectivity of a general scatter medium (which includes chaff plus atmospheric scatter) are presented. Analytical results on subcarrier phase instability produced in an FDM-FM system by the frequency selectivity of a general scatter medium are presented. (Author)

Descriptors :   (*RADIO JAMMING, TROPOSPHERE), COMMUNICATION AND RADIO SYSTEMS, RADAR CONFUSION REFLECTORS, FREQUENCY MODULATION, SCATTERING, DISTORTION, PROBABILITY, ATTENUATION, INTEGRAL EQUATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE