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An automated velocity dealiasing method based on searching for zero isodops
Author(s) -
Li Nan,
Wei Ming
Publication year - 2010
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.664
Subject(s) - aliasing , sign (mathematics) , zero (linguistics) , radar , partition (number theory) , doppler radar , range (aeronautics) , vector field , geodesy , computer science , mathematics , geology , mathematical analysis , filter (signal processing) , geometry , computer vision , combinatorics , engineering , telecommunications , aerospace engineering , linguistics , philosophy
Abstract A new automated velocity dealiasing method based on zero isodop searching has been developed primarily for linear wind fields. Its essence is to partition the radial velocity field obtained with a Doppler radar into two distinct regions of opposite velocity signs by two zero isodops. Zero isodops are searched point by point from the radar origin to the maximum detection range, and the accepted sign of each region separated by the zero isodops is determined. After that, the velocity sign at each gate is compared with the accepted sign of the region wherein the gate is. If they are consistent, the velocity is true; otherwise it is dealiased. Dealiasing results in real cases indicate that the new algorithm is practicable and effective, especially on aliasing lack of references affected by discontinuous echo or range folding, which is difficult for traditional methods of space continuity checking. Copyright © 2010 Royal Meteorological Society