Chapter 7 __________________________________________________ Host Computer Commands
VAISALA______________________________________________________________________ 281
V Selects radial velocity data.
8-Bit Velocity Format—Mean velocity, expressed as a
fraction of the unambiguous velocity interval, is computed
from the unsigned byte N as:
0 : Indicates velocity data is not available at this range
1 : Maximum velocity towards the radar
128 : Zero velocity
255 : Maximum velocity away from the radar
When velocity unfolding is selected, the output is still
interpreted as above, except that the unambiguous interval
is increased by factors of 2, 3, and 4 for 2:3, 3:4, and 4:5
unfolding.
16-Bit Velocity Format—Mean velocity in meters per
second (m/s) is computed from the unsigned word N as:
The overall range is from 327.67 m/s to +327.66 m/s in
one cm/s steps as follows:
0 : Indicates velocity data is not available at this range
1 : -327.67 m/s (towards the radar)
32768 : 0.00 m/s
65534 : +327.66 m/s (away from the radar)
65535 : Reserved Code
W Selects spectral width data.
8-Bit Width Format—Spectral width is computed from
the unsigned byte N as:
The overall range is a fraction between 1/256 to 255/256 of
the unambiguous interval. The code of zero indicates that
width data was not available at this range.
16-Bit Width Format—Spectral width in meters per
second (m/s) is computed from the unsigned word N as:
The overall range is from 0.01 m/s to 655.34 m/s in one
cm/s steps as follows:
0 : Indicates width data is not available at this range
1 : 0.01 m/s
65534 : 655.34 m/s
65535 : Reserved Code
Z Selects clutter corrected reflectivity data.
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