USER’S MANUAL__________________________________________________________________
114 _________________________________________________________________ M211322EN-D
Melting height: 3000 meters
The melting height is used in the HydroClass calculations, as well as
recorded with the data. This is the height above the radar, so you need to
include the altitude of the radar when computing. Normally this is set
automatically by the controlling application.
Enable noise power based correction of Z0: No
If set to 'Yes', the RVP900 adjusts the calibration reflectivity value Z0
when the current noise level changes from the level measured when the
calibration was done. For details, see Section 6.3.3.1 Noise Correction to
Reflectivity Calibration on page 217.
4.2.3 Mf — Clutter Filters
Default residual clutter LOG noise margins:
Baseline : 0.15 dB/dB for Clutter/Noise above 10dB
HiSignal : 1.00 dB/dB for Clutter/Noise above 50dB
Whenever a clutter correction is applied to the reflectivity data, the LOG
noise threshold needs to be increased slightly in order to continue to
provide reliable qualification of the corrected values. The reason for this is
that the uncertainty in the corrected reflectivity becomes greater after the
clutter is subtracted away.
For example, if we observe 20 dB of total power above receiver noise, and
then apply a clutter correction of 19 dB, we are left with an apparent
weather signal power of +1 dB above noise. However, the uncertainty of
this +1 dB residual signal is much greater than that of a pure weather target
at the same +1 dB signal level.
The "Residual Clutter LOG Noise Margin" allows you to increase the LOG
noise threshold in response to increasing clutter power. In the previous
example, and with the default setting of 0.15 dB/dB, the LOG threshold
would be increased by 19x0.15 = 2.85 dB. This helps eliminate noisy
speckles from the corrected reflectivity data.
Spectral Clutter Filters
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Window –1:Default 0:Rectangular 1:Hamming
Code 2:Blackman 3:ExBlackman 4:VonHann 5:Adaptive
Filter #1 Type:0(Fixed) Win:1 WidthPts:1 EdgePts:2
Filter #2 Type:0(Fixed) Win:2 WidthPts:2 EdgePts:2
Filter #3 Type:0(Fixed) Win:2 WidthPts:3 EdgePts:3
Filter #4 Type:1(Variable) Win:2 WidthPts:3 EdgePts:2 HuntPts:3
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