Accession Number : AD0682728

Title :   MULTIPATH SUPPRESSION BY SWEPT FREQUENCY METHODS,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : McGee,Richard A.

Report Date : NOV 1968

Pagination or Media Count : 29

Abstract : The suppression of multipath propagation effects by random and sinusoidal frequency modulation is investigated theoretically. Experiments using a 94 GHz 'noise' radar show the theoretical results to be correct. Suppression of multipath effects using Gaussian noise modulation exhibits an exponential behavior as a function of the product of the RMS frequency deviation (Delta omega) and the multipath delay time (Upsilon). Sinusoidal modulation results in multipath suppression which behaves as the absolute value of the zero order Bessel function of the first kind whose argument is (Delta omega Upsilon). (Author)

Descriptors :   (*RADAR RECEIVERS, MULTIPATH TRANSMISSION), RADAR INTERFERENCE, MILLIMETER WAVES, RADIOMETERS, NOISE, COHERENT RADAR, MODULATION, RADAR REFLECTIONS, REDUCTION

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE