F.1.2 VOL_A
The VOL_A task is the lower part of the hybrid volume scan VOL_A and VOL_B. It is
optimized for precipitation observations and measurements within a range of 250 km. Use a
single pulse repetition frequency mode for the maximum quality of Z and dual polarization
moments.
Dual polarization systems use the enhanced reflectivity Ze to improve sensitivity. The Z data
fields are quality-controlled for maximum rejection of non-meteorological echo. The Z data
presents the true fields of precipitation. The combined observations of KDP and Z are used
in quantitative rainfall estimates.
In dicult conditions with moving clutter, sea clutter, and interference, you can raise the PMI
threshold to as high as 0.55. Try a higher SQI value with some loss of precipitation in the
melting layer and in strong convection.
The following figure shows the configuration details of the task for a dual polarization
system. Blue circles indicate items with dierent values in single polarization systems.
Appendix F – Task Configuration Examples
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