User's Manual Part 2
Host Computer Commands
RVP8 User’s Manual
May 2003
6–8
A simple way to generate these values is to imagine four 16-bit quantities having the following
names and values: LOG=AAAA, CSR=CCCC, SQI=F0F0, SIG=FF00. The flag value needed
to represent a given logical combination of threshold outcomes is obtained as the result when
that same logical combination is applied to these special numbers.
For example:
(SQI or SIG) and CSR = (F0F0 or FF00 ) and CCCC
= (FFF0) and CCCC
= CCC0
which corresponds with one of the examples given above.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Threshold Control Flags for Corrected Reflectivity | Input 12
|_______________________________________________________________|
See Description for Input #11.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Threshold Control Flags for Velocity | Input 13
|_______________________________________________________________|
See Description for Input #11.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Threshold Control Flags for Width | Input 14
|_______________________________________________________________|
See Description for Input #11.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Bits to Invert in TAG Inputs 0 through 15 | Input 15
|_______________________________________________________________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Bits to Invert in TAG Inputs 16 through 31 | Input 16
|_______________________________________________________________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Intervening Gas Attenuation Correction (dB/km) | Input 17
|_______________________________________________________________|
Gas attenuation correction attempts to compensate for overall (two-way) beam losses due to
absorption by atmospheric gasses. The correction is linear with range, and is added to the data
along with range normalization. Therefore, clearing the RNV bit in Word #2 above disables the
correction. Of course, gas attenuation compensation can still be turned off even when RNV is
on, simply by setting a slope of 0.0 dB/km.
An attenuation of G db/km is encoded into the unsigned 16-bit word N as follows:
0 N 10000 G = N / 100000
else G = 0.1 + (N – 10000)/10000