Accession Number : AD0878341

Title :   Broad-Spectrum Electromagnetic Backscatter.

Descriptive Note : Technical rept.,

Corporate Author : KANSAS UNIV CENTER FOR RESEARCH INC LAWRENCE

Personal Author(s) : Waite, William P.

Report Date : AUG 1970

Pagination or Media Count : 175

Abstract : An experimental investigation of broad-spectrum electromagnetic backscatter was performed. Continuous spectral responses of natural and manmade targets and surfaces were measured to examine the fine grain and gross variations with frequency of the backscattered return. The frequency variation of a discrete scatterer model was examined for a variety of illuminating conditions. Experimental measurements of return variance for several effective bandwidths were compared with the predictions of the theoretical model. The spectral response variations remaining after the removal of fading affects were normalized and compared with similar response characteristics from the visual and infrared regions. Monochromatic and panchromatic images were produced to illustrate the improvement obtainable with frequency averaging. The results of this experiment graphically illustrate the improvement in return variance possible with panchromatic illumination. In addition, the spectral response variations remaining after the removal of fading effects were shown to be comparable to the variations encountered in the visual and infrared regions. (Author)

Descriptors :   (*RADAR SCANNING, BROADBAND), (*ELECTROMAGNETIC FIELDS, BACKSCATTERING), RADAR IMAGES, TERRAIN, ANALYSIS OF VARIANCE, TARGET DISCRIMINATION, BANDWIDTH, SPECTRUM SIGNATURES, MONOCHROMATIC LIGHT, MATHEMATICAL MODELS, FREQUENCY, COMPUTER PROGRAMMING, STATISTICAL DISTRIBUTIONS.

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE