Accession Number:

ADA393735

Title:

Statistical Electromagnetics

Descriptive Note:

Final rept. Mar 1995-Jan 1998

Corporate Author:

SHIELD RITE INC ALBUQUERQUE NM

Personal Author(s):

Report Date:

1998-01-14

Pagination or Media Count:

268.0

Abstract:

Deterministic treatment of High-Power Microwaves or Radio-Frequency Interference internal coupling to wiring and cabling of highly overmoded enclosures is too detailed to be practical. However, statistical models thrive on complexity. In this report, cable current distributions on the ElectroMagnetic Pulse Test AirCraft airframe, a Global Positioning Satellite bus, and the Celestron 8 satellite telescope are modeled statistically when illumination is external and penetration is through apertures or cables entering from the exterior. The observed field power fluxes and cable powers are tested against a chi-square distribution with two degrees of freedom , a beta distribution, a log-normal distribution, and a curious hybrid distribution due to Lehman, which would pertain to a variate which is the product of two chi-square distributions, one having two, and the other six, degrees of freedom. We demonstrate that, if the enclosure cables are modeled with a simulated drive having a Lehman distribution, it is possible to replicate the experimentally observed power distribution within a factor of two, although cable powers themselves look more like a chi-square distribution than a Lehman distribution. We have also constructed a hardwaresoftware assembly incorporating a Pentium PC and an HP8753 Network Analyzer which can 1 illuminate an enclosure externally with 1 watt of power, 2 can measure the field, or cable current, response inside the enclosure, and 3 compares experiment with theory.

Subject Categories:

  • Statistics and Probability
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE