Vaisala RVP900, User Manual, Page: 193 / 484

dB
P
ow
er
Velocity
dB
P
ow
er
dB
P
ow
er
Spectrum with ground clutter
Remove 5 interior points
Interpolate across 5 center points
Find minimum of 2 edge points
Vu Vu
+
–
0
Figure 41 Fixed Width Clutter Filter Examples
This procedure attempts to preserve the noise level and/or overlapped weather targets. The
result is that more accurate estimates of dBZ are obtained. In extreme cases when the
weather spectrum is very narrow, there can still be some attenuation of weather of a broad
filter is selected.
7.3.5.2 Variable Width Clutter Filter
This is similar to the fixed width filter, except that the algorithm attempts to extend the
boundary of the clutter by determining which is the first component outside the clutter
region to increase in power.
Chapter 7 – Processing Algorithms
191