Backscattered Spectra from Rotating and Vibrating Short Wires and Their Relation to the Identification Problem PDF Download
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Author: Ronald G. Newburgh Publisher: ISBN: Category : Backscattering Languages : en Pages : 40
Book Description
In the report Rayleigh scattering for a short wire is examined for two simple motions, rotation and vibration. Rotation of the wire causes an amplitude modulation and vibration causes a phase modulation. Each of these modulations influences the backscattered spectra so that the characteristic frequency of the periodic motion appears. For the rotating wire, it is twice the rotation frequency. From the spectra it is possible to recognize the type of motion responsible. The study therefore serves as a first step in the development of models for complicated motions of actual objects such as tanks and trucks, thereby leading to possible vehicle signature classification schemes. The appendices include: a brief discussion of the formalism of polarization scattering matrices; a short examination of the relation between the scattered spectra due to periodic motions and the conventional Doppler effect; and an examination of the analogy between the rotating and vibrating wires and molecules as conventional Raman scatters, including a brief section on the energetics of the scattering process.
Author: Ronald G. Newburgh Publisher: ISBN: Category : Backscattering Languages : en Pages : 40
Book Description
In the report Rayleigh scattering for a short wire is examined for two simple motions, rotation and vibration. Rotation of the wire causes an amplitude modulation and vibration causes a phase modulation. Each of these modulations influences the backscattered spectra so that the characteristic frequency of the periodic motion appears. For the rotating wire, it is twice the rotation frequency. From the spectra it is possible to recognize the type of motion responsible. The study therefore serves as a first step in the development of models for complicated motions of actual objects such as tanks and trucks, thereby leading to possible vehicle signature classification schemes. The appendices include: a brief discussion of the formalism of polarization scattering matrices; a short examination of the relation between the scattered spectra due to periodic motions and the conventional Doppler effect; and an examination of the analogy between the rotating and vibrating wires and molecules as conventional Raman scatters, including a brief section on the energetics of the scattering process.
Author: Ralph E. Kleinman Publisher: ISBN: Category : Backscattering Languages : en Pages : 44
Book Description
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 v/c, 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).
Author: Ronald G. Newburgh
Author: Ronald G. Newburgh
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Author: Scripps Institution of Oceanography. Library
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Author: Ralph E. Kleinman
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Author: Technology Reports Centre (Great Britain)
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