USER’S MANUAL__________________________________________________________________
240 _________________________________________________________________ M211322EN-D
Assume that I
o
with loss correction is calculated to be -105 dBm (3.16 ×
10
-11
mW), then dBZ
o
is:
This value would be down-loaded to the signal processor using the
SOPRM command.
6.6 Dual PRT Processing Mode
The RVP900 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 will be
organized so that the first pulse of a short PRT pair always comes first.
6.6.1 DPRT-1 Mode
The DPRT-1 trigger consists of a very short PRT from which Doppler data
are obtained, followed by a much longer PRT whose purpose is to limit the
average duty cycle of the transmitter. No information is extracted from the
long PRT pair, but Dual-PRF techniques can still be used by varying the
short period from ray to ray. The "-1" suffix in the name for this mode is a
reminder that Doppler parameters are computed from the short PRT only.
The DPRT-1 mode is intended for millimeter wavelength radars that must
run at a very high effective PRF (up to 20 KHz) to get an acceptable
unambiguous velocity, but which also have a much lower duty cycle
constraint on the average number of pulses transmitted each second.
In DPRT-1 mode the requested PRF from the host computer will generally
be quite large (up to 20 KHz); and the reciprocal of this "effective
instantaneous PRF" will determine the trigger's short PRT interval. In this
way, all subsequent physical calculations will be scaled correctly, for
example, unambiguous velocity, maximum first trip range, etc., are all
NOTE
These modes were originally implemented in the RVP7 processor, but
have not yet been ported into the RVP900.
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