Chapter 7 __________________________________________________ Host Computer Commands
VAISALA______________________________________________________________________ 283
8-Bit KDP Format—Values are coded into an unsigned
byte using a logarithmic scale. The KDP angles are
multiplied by the wavelength in cm (to reduce dynamic
range) and then converted to a log scale separately for both
signs. The minimum value is 0.25 deg*cm/km, and the
maximum value is 150.0 deg*cm/km. A code of zero
represents no data, and a code of 128 represents 0
deg*cm/km. The conversion equation for positive values
(codes from 129 to 255) is:
The conversion equation for negative values (codes from 1
to 127) is:
16-Bit KDP Format—Same as 16-bit deciBel format,
except that the units are hundredths of degrees per
kilometer. No weighting by wavelength is introduced.
PDP Selects dual polarization differential phase φ
DP
data.
8-Bit φ
DP
Format—The phase angle in degrees is
computed on a 180-degree interval from the unsigned byte
N as:
0 : Indicates no φ
DP
data available at this range
1 : 0.00 deg
254 : 179.29 deg
255 : Reserved Code
16-Bit φ
DP
Format The phase angle in degrees is
computed on a 360-degree interval from the unsigned word
N as:
0 : Indicates no φ
DP
data available at this range
1 : 0.00 deg
65534 : 359.995 deg
65535 : Reserved Code
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