Accession Number:

ADA207504

Title:

Efficient Dealiasing of Doppler Velocities Using Local Environmental Constraints,

Descriptive Note:

Corporate Author:

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION NORMAN OK NATIONAL SEVERE STO RMS LAB

Personal Author(s):

Report Date:

1989-01-01

Pagination or Media Count:

45.0

Abstract:

A Doppler velocity dealiasing algorithm is described that processes one radial at a time by comparing that radial with a previous radial. This technique has worked reliably on numerous Doppler radar data sets for clear air, thunderstorm, and sever thunderstorm situations. It was also tested on four volume scans from severe weather environments with difficult aliasing problems to determine statistically how well the algorithm performs in a worst case environment. Of some 1.2 million velocities in these severe storms, 0.2 were improperly dealiased, and 93 of those were above 13 km height in the storm-top divergent region where shears were extreme. Every tornado, mesocyclone, gust front, microburst and storm-top divergent signature was preserved, and could be identified by automated algorithms. This algorithm is adaptive and therefore efficient because simple checks are made initially, and progressively more sophisticated and time-consuming checks are used only if they are needed. Keywords Doppler radar Velocity Microburst Algorithm Wind shear. jhd

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE