User's Manual Part 2

Host Computer Commands
RVP8 User’s Manual
May 2003
6–17
16-Bit ZDR Format — Same as 16-bit deciBel format.
KDP Selects dual polarization specific differential phase data.
8-Bit KDP Format — Values are coded into an unsigned byte using a logarith-
mic 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:
KDP    0.25  600

N129
126

The conversion equation for negative values (codes from 1 to 127) is:
KDP    –0.25  600

127N
126

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 
DP
data.
8-Bit 
DP
Format — The phase angle in degrees is computed on a 180-degree
interval from the unsigned byte N as:

DP
(mod180) = 180 (N – 1) / 254
0 : Indicates no 
DP
data available at this range
1 : 0.00 deg
254 : 179.29 deg
255 : Reserved Code
16-Bit 
DP
Format — The phase angle in degrees is computed on a 360-degree
interval from the unsigned word N as:

DP
(mod360) = 360 (N – 1) / 65534
0 : Indicates no 
DP
data available at this range
1 : 0.000 deg
65534 : 359.995 deg
65535 : Reserved Code
RHV Selects dual polarization correlation coefficient 
HV
data.
8-Bit 
HV
Format — The correlation coefficient is computed on the interval 0.0
to 1.0 using a square root weighting of the unsigned byte N as:

HV
 
(
N  1
)
253

0 : Indicates no 
HV
data available at this range
1 : 0.0000 (dimensionless)
2 : 0.0629
253 : 0.9980