Spectral parameters estimation in precipitation for 50 MHz band atmospheric radars

MILLIMETER - WAVELENGTH RADARS New Frontier in Atmospheric Cloud and Precipitation Research

Review of Frequency Usage for Oceanographic Radar in the 3-50 MHz Band

WRC-12 on February under the Agenda Item 1.15 reviewed the possibility of frequency allocations for oceanographic radars in portions of the 3-50 MHz frequency range, and resolved to allocate several portions of the frequency bands in accordance with the Resolution 612 (Rev. WRC-12). Thus it is possible to use for oceanographic radars as much as 2 425 kHz width in the frequency range of 3-50 MHz...

Improved Polarimetric Calibration for Atmospheric Radars

Polarization properties of radar waves that are scattered from atmospheric objects are of great interest in meteorological studies. However, polarimetric radar measurements are often not sufficiently accurate for retrieving physical properties of targets. To compensate for errors, radar polarimetric calibration is applied. Typical calibrations are performed based on measurements of point target...

Spectral methods for voice source parameters estimation

A spectral approach is proposed for voice source parameters representation and estimation. Parameter estimation is based on decomposition of the periodic and the aperiodic components of the speech signal, and on spectral modelling of the periodic component. The paper focusses on parameters estimation for the periodic component of the glottal ow. A new anticausal all-pole model of the glottal ow...

Adaptive two-band spectral subtraction with multi-window spectral estimation

An improved spectral subtraction algorithm for enhancing speech corrupted by additive wideband noise is described. The artifactual noise introduced by spectral subtraction that is perceived as musical noise is 7 dB less than that introduced by the classical spectral subtraction algorithm of Berouti et al. Speech is decomposed into voiced and unvoiced sections. Since voiced speech is primarily s...