Accession Number : AD0654355

Title :   FURTHER ANALYSIS OF RADAR TERRAIN RETURN,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Spetner,L. M. ; Katz,I.

Report Date : 10 NOV 1959

Pagination or Media Count : 20

Abstract : The paper presents additional steps in progress toward a fuller understanding of terrain and sea reflectivity at microwave frequencies. Large amounts of new data are being studied to test existing theories. The prevailing 'interference' explanation regarding polarization differences is shown to be inadequate. Detailed study of circular disk reflectivity is being carried out to help explain adequately the polarization dependence. Terrain is categorized as 'rough' or 'smooth'; one may select between them by the slope of the cross section vs depression angle curve. Whether a terrain is rough or smooth also depends on the radiated wave length. Previous theoretical work led one to expect a cross section vs depression angle, theta, dependence of exp(- k cot to the 2nd power theta) for water surfaces. The data indicate this should be modified to exp(- k cot theta). (Author)

Descriptors :   (*RADAR REFLECTIONS, TERRAIN), MICROWAVE FREQUENCY, POLARIZATION, RADAR CROSS SECTIONS, RADAR CLUTTER

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE