Extended Abstract (132K)P7.10
The production of high quality Doppler velocity fields for dual PRT weather
Peter T. May, BMRC, Melbourne, Vic., Australia; and P. I. Joe
A widely used approach to mitigate the range-velocity ambiguity problem is using a dual PRT (Pulse Repetition Time). This may be on a pulse pair to pulse pair basis, where the time between pulses is varied on every pulse pair or where alternate records of, for example 32 pulses, are sampled at a single, but different PRT (dual PRT). The latter is used in operational radars in Australia and Canada. There are limitations of dual PRT (Pulse Repetition Time) radars for measurements of wind fields with strong horizontal wind gradients or where there are significant measurement uncertainties. In such conditions, errors may occur even if the radial velocity measurements in the individual rays are not aliased. Methods are described to correct these wind fields that successfully produce high quality data. Simulated and real examples will be shown of mesocyclones. The worst problems occur when the wind speeds are large over regions of intense ground clutter. In this case, a combination of measurement noise, clutter and the clutter filters themselves badly affect the data.
Poster Session 7, Algorithms—Data Quality
Friday, 20 July 2001, 2:00 PM-3:30 PM
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