2-DIMENSIONAL DEALIASING OF DOPPLER VELOCITIES

The Doppler velocity dealiasing problem has been discussed for many ye ars. Because aliasing is easily identified by detecting abrupt changes in the data field, most existing algorithms use this technique to cor rect aliased data. Such algorithms are typically based on local expans ion methods. Such methods make a dealiasing decision for each gate bas ed on the information of its dealiased neighbors and thus can be sensi tive to scattered incorrect data. This paper introduces a new approach that attempts to find all dealiased values for a given dataset by sol ving a linear system involving the entire dataset and thus avoiding lo cal expansion. Because the solution is global, the new technique is co nceptually simple and displays good performance on a number of test ca ses. The new technique described here was implemented to support real- time dealiasing in an operational setting.