Mark A. Sletten

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Direct numerical simulations of sea surface scattering are used to evaluate the accuracy of a recently proposed analytical model for ocean-generated Doppler spectra. Comparisons are performed for backscattering at incidence angles varying from near-nadir to low grazing at Land X-bands. Doppler centroids predicted by the model show, as expected, large(More)
—This paper summarizes an analysis of gradient-induced distortions in the surface current estimates generated by along-track interferometric SAR (ATI-SAR) systems. In the presence of spatial current gradients, an effect akin to velocity bunching can cause distortion in the measured current profiles. This distortion is caused by variation in the azimuthal(More)
A dual-beam along-track interferometric synthetic aperture radar which is entirely self-contained within an aircraft pod has been developed by the University of Massachusetts to study sea surface processes in coastal regions. The radar operates at 5.3 GHz with a bandwidth of up to 25 MHz. System hardware is described. Initial test flights aboard the NOAA(More)
[1] The anomaly of radar sea spikes, defined here as the non-Bragg scattering events with backscattering cross-section of horizontal polarization exceeding that of the vertical polarization, has been associated with steep wave features possibly going through wave-breaking process, with or without whitecap manifestation. This property is exploited for using(More)
[1] The technique for extracting wave period and wave direction from radar backscattering intensity is well developed, but the determination of spectral density or wave height is hindered by the complex nature of the modulation transfer function. In contrast to backscattering intensity, the Doppler signal of a coherent radar is originated from the radial(More)