Vaisala RVP900 - Table 68 PROC 8-Bit and 16-Bit Data Formats

The ARC selects the archive output format in which four data bytes (see 8-Bit descriptions
below) are packed in two output words per bin as follows:
HighByte Low Byte
--------------------
| | |
| V | Z |
| | |
--------------------
--------------------
| | |
| W | T |
| | |
--------------------
The remaining data parameters are available in both 8-Bit and 16-bit formats, according to
SOPRM Command Input word #2 (see 8.4 Setup Operating Parameters (SOPRM)
(page 239)). The same SOPRM word configures RVP900 for single or dual polarization. The
latter is required for Kdp, PDP, and RHV to be computed properly.
Table 68
PROC 8-bit and 16-bit Data Formats
Parameter Description 8-bit Format 16-bit Format
V
Selects radial
velocity data.
Mean velocity, expressed as a
fraction of the unambiguous
velocity interval, is computed
from the unsigned byte N as:


sec
= 

×
  128
127.5
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.
Mean velocity in meters per
second (m/s) is computed from
the unsigned word N as:


sec
=
  32768
100
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
RVP900 User Guide M211322EN-J
258