Vaisala RVP900

Chapter 7 __________________________________________________ Host Computer Commands
VAISALA______________________________________________________________________ 269
0916-087
See Description for Input #11.
0916-088
When differential reflectivity is computed there is a possibility that radar
asymmetries will introduce a bias in the Zdr values, that is, that Zdr will be
non-zero even when observing purely spherical targets. This calibration
offset permits nulling out this effect. The GDR offset accounts for the
overall Tx/Rx gain imbalance between the two channels of the radar.
0916-089
The radar wavelength is used in the calculation of 16-bit velocity and width
data, to convert from Nyquist units to absolute physical units.
0916-090
The XDR offset is used in the Linear Depolarization Ratio equations, and
is the differential receiver gain between the two channels. Unlike the GDR
offset (used for Z
dr
), the gain difference does not depend on differential
transmit power.
0916-091
Range smoothing can be performed on raw moment data prior to the
computation of scientific parameters. The number of bins to sum together
is given here. This should generally be an odd integer so that no range bias
is introduced by the smoothing operation.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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| Threshold Control Flags for Differential Reflectivity (Zdr) | Input 18
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| Signed Zdr Calibration Offset in 1/16 dB (GDR) | Input 19
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| Radar Wavelength in Thousandths of Centimeters | Input 20
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| | | | | | | | | | | | | | | | |
| Signed LDR Calibration Offset in 1/100 dB (XDR) | XARG 1
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Range smoothing (0:None, 1:pairs, etc) | XARG 2
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