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Time-frequency analysis of SAR image with ground moving targets. Phase-unwrapping of SAR interferogram with muti-frequency or multi-baseline. On estimation of multiple frequencies in undersampled complex valued waveforms. Multiple frequency detection in undersampled complex-valued waveforms with close multiple frequencies. An efficient frequency(More)
The sensitivity of the inverse filter to noise is often thought to be the reason that inverse fllter restorations of motion-blurred images are normally dominated by errors. In this paper, we show that even in the absence of noise, there is a large error component, called the edge error, that arises due to the fact that real images seldom have the(More)
—A radar image acquired by the C-band synthetic aperture radar (SAR) aboard the European Remote Sensing satellite ERS-2 over the coastal waters south of Singapore showing radar signatures of a strong tropical squall line (" Sumatra Squall ") is compared with coincident and collocated weather radar data. Squall line features such as the gust front, areas of(More)
Brillouin measurements have been made of the spin dynamics of high-density two-dimensional hexagonally ordered 20 nm diameter Fe48Co52 nanowire arrays, with various interwire spacings, as a function of longitudinal magnetic field. The experimental data are analyzed within the Arias-Mills theory based on interwire dipolar couplings in the arrays. The results(More)
We report the experimental observation of band gaps in a synthetic nanostructured magnonic crystal composed of two different magnetic materials. The sample, in the form of a one-dimensional periodic array comprising alternating Permalloy and cobalt nanostripes, has been fabricated using advanced lithographic techniques. Dispersion relations of spin waves in(More)
Just as a photonic crystal is a periodic composite composed of materials with different dielectric constants, its lesser known magnetic analogue, the magnonic crystal can be considered as a periodic composite comprising different magnetic materials. Magnonic crystals are excellent candidates for the fabrication of nanoscale microwave devices, as the(More)
The interfacial Dzyaloshinskii-Moriya interaction in an in-plane anisotropic Pt(4  nm)/Co(1.6  nm)/Ni(1.6  nm) film has been directly observed by Brillouin spectroscopy. It is manifested as the asymmetry of the measured magnon dispersion relation, from which the Dzyaloshinskii-Moriya interaction constant has been evaluated. Linewidth measurements reveal(More)