Vaisala RVP900

Chapter 6 ______________________________________________________ Processing Algorithms
VAISALA______________________________________________________________________ 183
The following sections cover the various parts of the diagram shown in
Figure 36 on page 182, that is:
- IF Signal Processing
- I/Q processing and clutter filtering
- Range averaging and clutter microsuppression
- Moment calculations (reflectivity, velocity, spectrum width)
- Thresholding for data quality and Speckle Filtering
- Reflectivity Calibration
- Special algorithms for ambiguity resolution (dual PRF, dual PRT,
Random Phase)
- Calibration and Testing
Table 9 Algebraic Quantities Within the RVP900 Processor
p Instantaneous IF-receiver data sample Real
b Instantaneous Burst-pulse data sample Real
I, Q Instantaneous quadrature receiver components Real
s Instantaneous time series phaser value Complex
s' Time series after clutter filter Complex
T
0
Zero
th
lag autocorrelation of A values
Real
R
0
Zero
th
lag autocorrelation of A' values
Real
R
1
First lag autocorrelation of A' values Complex
R
2
Second lag autocorrelation of A' values Complex
SQI Signal Quality Index Real
V Mean velocity Real
W Spectrum Width Real
CCOR Clutter correction Real
LOG (Signal+Noise)/Noise ratio for thresholding Real
SIG Signal power of weather Real
C Clutter power Real
N Noise power Real
Z Corrected Reflectivity factor Real
T UnCorrected Reflectivity factor Real