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Spectral analysis for Doppler radar: a parametric model for regularisation

The authors propose a new spectral analysis technique for Doppler radar. They present some limitations of classical methods which motivate their study. Particularly they insist on bias introduced on the wind speed profile in the case of wind shear and strong variations of the reflectivity. In order to improve this behaviour, they introduce a realistic backscattered wave modeling based on stratification of the range gate. Regularisation is necessary to compensate observation limitation specially for some range gates where the SNR is poor. For this purpose they introduce a parametric wind speed profile, to take into account spatio-temporal continuity. They propose a second order steepest descent algorithm which recursively fits the parametric spectrum to the observation. Simulation results demonstrate the expected improvement. The algorithm is also tested on real data.