Accession Number:

ADA067672

Title:

Extrapolation of Induced Transient Surface Currents on a Scatterer to General Band-Limited Excitation Conditions.

Descriptive Note:

Interim technical rept. 1 May 77-1 Oct 78,

Corporate Author:

KENTUCKY UNIV LEXINGTON DEPT OF ELECTRICAL ENGINEERING

Personal Author(s):

• Pearson,L. Wilson
• Roberson,D. Randall

Report Date:

1978-10-01

Pagination or Media Count:

58.0

Abstract:

A technique for the extraction of an approximate Singularity Expansion description of the electromagnetic response of a scatterer is presented. The description is extracted from transient waveforms which are spatial samples of the transient current on the scatterer excited by a known excitation. The method can use any reliable Prony-type processor for exponential analysis of the transient waveforms so long as it provides physically-meaningful poles from the waveforms. The fact that Singularity Expansion poles are common to all waveforms on the object provides a computational advantage over a waveform-by-waveform Prony-type analysis. A consensus pole set procedure is described to exploit this redundancy. Some issues relating to the completeness of a set of transient data to the class of excitations to which the Singularity Expansion is applied is discussed. The one-dimensional example of a thin-wire scatterer is used to test the practicability of the method. The ultimate utility of the method is demonstrated by way of expansion of the extracted data to new excitations. Recommendations are made toward an implementation of the method using measured data. Author

Descriptors:

• *ELECTROMAGNETIC SCATTERING
• TRANSIENTS
• MATHEMATICAL ANALYSIS
• EXTRAPOLATION
• GAUSSIAN QUADRATURE
• LAPLACE TRANSFORMATION

Subject Categories:

• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE