USER’S MANUAL__________________________________________________________________
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where the signal power S is determined as described in the preceding
section.
6.3.9 (Signal+Noise)/Noise Ratio (LOG
Threshold)
A threshold parameter called LOG is also calculated to provide a signal
strength estimate that is useful for qualifying reflectivity. For historical
reasons, the LOG threshold is not the true SNR (whose dB representation
can be both positive and negative) but rather, the ratio of Signal plus Noise
to Noise, which always has a positive representation in dB. Specifically:
6.4 Thresholding
An important feature of the RVP900 is its ability to accept or reject
incoming data based on derived properties of the signals themselves.
Typically, "rejected" data are not displayed by the user's software, thus
making for very clean weather presentations.
6.4.1 Threshold Qualifiers
For data quality control, each RVP900 output parameter can be qualified,
that is, either accepted or rejected for output, based on four threshold
criteria:
The calculation of the measured levels (for example, SQI) for each of these
qualifications has been described in previous sections of this chapter. All
four qualification criteria can be switched on and off independently, and
the threshold levels (for example, SQI
thresh
) can each be set independently.
ID Criterion Name Pass Criterion
LOG (Signal+Noise)-to-Noise Ratio LOG > threshold
SQI Signal Quality Index SQI > threshold
CCOR Clutter Correction CCOR > threshold
SIG Weather Signal Power SIG > threshold
PMI Polarimetric Meteo Index PMI > threshold
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