Chapter 6 ______________________________________________________ Processing Algorithms
VAISALA______________________________________________________________________ 225
R0, R1, R2 Clutter Correction
In this case there is enough information to compute the clutter signal and
noise power inde-pendently. The algorithm for CCOR is:
The clutter power is computed from:
The signal power S is then computed from:
W is the width that has been previously calculated. This approach yields
more accurate results for the clutter correction in the case of a low SNR.
6.3.8 Weather Signal Power (SIG
Threshold)
A parameter called SIG is also calculated to provide an estimate of the
weather signal-to-noise ratio in dB for thresholding. The SIG calculation
is different depending on the whether the optional R2 autocorrelation is
computed.
R
0
, R
1
Calculation
In this case the SIG is computed as follows:
This term represents the SNR after the removal of clutter. The CCOR value
is the one de-scribed for R
0
, R
1
in the previous section.
R
0
, R
1
, R
2
Calculation
In this case the SIG is computed based on the SNR which is:
To Next Page
Loading...