If the value of I
0
calculated above was not based on loss-corrected dBm values, correct I
0
as follows:
0
=
0
+
:
Example Calculation of dBZo
Use this sample calculation to check your arithmetic. The radar parameters:
Table 60 Radar Parameters
Parameter Description Value
Radar wavelength in cm. 5 cm
Transmitted power in kW. 500 kW
Transmit loss. 2 (3 dB)
Pulse width in microseconds. 1 microsecond
Horizontal half-power beamwidth in
degrees.
1°
Vertical half-power beamwidth in degrees. 1°
Antenna gain (dimensionless) on beam
axis.
19,953 (43.0 dB)
The radar constant for this example is,
=
2.69 × 10
16
2
2
=
2.69 × 10
16
5
2
500 1 1 19, 953
2
2.0 = 6.76 × 10
6
6
3
2
1
Assume that I
0
with loss correction is calculated to be -105 dBm (3.16 × 10
-11
mW), then
dBZ
o
is:
0
= 10log
0
2
0
= 10log 6.76 × 10
6
1
2
3.16 × 10
11
= 36.7
6
3
You can download this value to the signal processor using the SOPRM command.
7.7
Dual PRT Processing Mode
These modes were originally implemented in the RVP7 processor, but have not yet been
ported to RVP900.
RVP supports two major modes for Dual PRT processing, that is, algorithms using triggers
that consist of alternate short and long periods. Most of the Doppler parameters are
available in each of these modes. You may also request time series data in both cases; the
samples are organized so that the
first pulse of a short PRT pair always comes first.
RVP900 User Guide M211322EN-J
220
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