Electromagnetic Scattering by a Linearly Oscillating Target.
Physical sciences research papers,
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS
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A theoretical analysis is presented in this report which shows that when a plane electromagnetic wave is incident upon a perfectly conducting, linearly oscillating, arbitrarily shaped target, the scattered far field differs only in phase from the field scattered when the target is motionless. The explicit form of the phase modulation factor is derived to an accuracy of the order of vc, where v and c are the velocities of target motion and electromagnetic waves respectively. Spectral analysis of the modulation shows that the power distribution varies with the shape of the motion, wavelength of the incident field, and magnitude of the projections of the oscillation in the incident and receiver directions. Power spectra are calculated for square, triangular, and sinusoidal periodic target motion as well as a superposition of two sinusoids of different frequency and amplitude. The results indicate that even small amplitude oscillations produce measurable modulations of the scatter field. Author
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