Approximate Methods for Obtaining the Complex Natural Electromagnetic Oscillations of an Object.
OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB
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The complex natural resonances poles of an object are excitation aspect and polarization independent. The primary goal of this dissertation is to develop a rational function approximation RFA for use in pole extraction from the measured scattering spectrum data of broadband radar systems. Applications of the RFA are demonstrated for a variety of simple as well as complex objects. The results obtained are compared with those poles extracted using other methods. To overcome noise problems, two preprocessing techniques--a sum operator and a zero-phase-shift digital filter are developed. The minimum signal-to-noise ratio additive is explored such that reliable pole extraction is still feasible. Finally, RFA are applied to the measured data of complex geometric targets scale models of aircraft.
- Active and Passive Radar Detection and Equipment
- Electricity and Magnetism
- Radiofrequency Wave Propagation