Accession Number:

AD0669372

Title:

A GEOMETRICAL THEORY OF DIFFRACTION ANALYSIS OF THE RADAR CROSS SECTION OF A SECTIONALLY CONTINUOUS SECOND-DEGREE SURFACE OF REVOLUTION

Descriptive Note:

Quarterly rept. 1 Jan-31 Mar 1968

Corporate Author:

OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB

Personal Author(s):

Report Date:

1968-03-01

Pagination or Media Count:

195.0

Abstract:

The radar cross section of a continuous, convex, body of revolution composed of N sections, each section described by a second-degree equation has been analyzed using the geometrical theory of diffraction. Wedge diffraction has been applied to determine the scattered field due to discontinuities in slope between sections of the target, and creeping wave theory has been applied to determine the scattered field due to propagation of energy around the target. A solution for the diffracted field on an axial caustic is presented. An approximate solution for the scattered field near and at the normal direction to a conical generator is developed. A simplified ray path geometry for the creeping wave is presented and related to the scattering by spheres and prolate spheroids. The H-plane field of the sphere is calculated using creeping wave techniques for a ray geometry defined by the Poynting vector at the shadow boundary. The approximate creeping wave solution for the edge-on backscattering of disks is developed and applied to ogival, circular and elliptical disks. The above techniques have been assembled into two computer programs for automatic computation of the radar cross section. These programs have been tested for cones, double cones, cylinders, conically capped cylinders, spheroids, and various prolate spheroid-sphere and prolate spheroid-oblate spheroid combination targets.

Subject Categories:

  • Computer Programming and Software
  • Active and Passive Radar Detection and Equipment
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE