A variational de-aliasing technique

Abstract A new de-aliasing algorithm for Doppler velocity radar data is presented. Regions of equal Nyquist number are identified and marked by centroids. These regions are de-aliased using a variational analysis technique forcing the following (weak) constraints to be satisfied: 1) agreement with the general flow (from VAD, echo tracking or model wind field), 2) conservation of the zero velocity line, 3) removal of shear caused by velocity folding and 4) minimization of errors between observations and the linear interpolation along lines connecting the centroids. First de-aliasing tests with real Doppler data in a wind retrieval procedure axe promising.