Low EM Signature Response Techniques.
Abstract
This study extends the technique for computing the smoothed impulse response to the case of scattering from triangular plates, quadrilateral plates, and more refined aircraft models that consist of a cylindrical fuselage with triangular or quadrilateral plates for the wings, stabilizers, and rudder. To the knowledge of Sperry, this is the first time that a successful solution of these problems has been obtained. The numerical techniques developed consisted of the simultaneous solution of two vector space-time integral equations. A major effort was required in order to handle non-rectangular plate geometries. The resulting numerical procedure consisted of a set of local coordinate transformations in the plate edge regions in order to be able to properly satisfy the boundary conditions on the surface currents. Results were computed for several triangular plates, finned cylinders, and a MIG-21 aircraft model. These results were found to be in good agreement with measurements taken on the Sperry time domain scattering range. In addition measured results were obtained for the response of scattering centers when coated with RAM (Radar Abosrbing Materials). These results show that RAM can lower the scattered response but that the amount of reduction is dependent upon the spectrum of the illumination and the aspect angle. Moreover, there were several frequencies where the RCS experienced nulls of an additional 8-10 db.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1979
- Accession Number
- ADA068211
Entities
People
- C. L. Bennett
- H. Mieras
- J. P. Tommey
- S. L. Teeter
Organizations
- Sperry Corporation