The Spectrum of Electromagnetic Scatter from an Ensemble of Bodies with Angular Periodicity, as a Model for Jet Engine Modulation
Abstract
A rotating ensemble of bodies of arbitrary shape with angular periodicity scatters an electromagnetic wave to produce a spectrum of frequency components characteristic of the structure and its rotation. The spectrum and its properties are predicted through electromagnetic field theory. The theory has been developed such as to exploit the angular periodicity and therefore reduce the computational load by a large factor. A consequence of the approach is that the spectrum is found directly. Many of the predictions have been confirmed by direct computation of the scattered field for a series of rotational positions to simulate a time series, followed by a discrete Fourier transforming to produce the spectrum.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2001
- Accession Number
- ADA392294
Entities
People
- John Cashman
Organizations
- Defence Science and Technology Group