Target Strength: An Overview of Some Recent Theoretical Developments,
POLYTECHNIC UNIV FARMINGDALE NY WEBER RESEARCH INST
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With the increasing availability of short pulse sources of electromagnetic energy, targets can be subjected to broadband illumination, which gives rise in the returned signal to a rich variety of phenomena not encountered under time-harmonic or narrow-band conditions. Some recent theoretical developments that seek to cope with, and take advantage of, the resulting enhanced flexibility for target assessment and classification are summarized here. Basically, the techniques to be described seek to manipulate wave spectra in such a manner as to yield compact observable spectral objects with significant physical content. These compact spectral objects are then employed to interpret synthetic or real transient scattering returns and relate distinctive features in these returns to distinctive features of the target giving rise to them. Depending on whether the structural information content is local or global, the respective wave objects characterizing them are progressing wavefronts and oscillatory resonances, the transient analog of ray fields and modal fields under time-harmonic conditions.
- Target Direction, Range and Position Finding
- Radiofrequency Wave Propagation