Vaisala RVP900, Руководство пользователя

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Transmitter phase switch point: -1.00 usec
Polarization Switch
The RVP900
POLAR1
and
POLAR2
digital output lines control the polarization switch in a
dual–polarization radar.
During data processing modes in which the polarization alternates from pulse to pulse.
These questions set the transition points of the control signals.
The values are in microseconds relative to range zero. The same units define the start times
of the six user triggers.
To optionally set the logical sense of the polarization output lines, invert the signals in the
softplane.conf
file.
Limits: -500 μsec ... 500 μsec
Polarization switch point for POLAR1: -1.00 usec
Polarization switch point for POLAR2: 1.00 usec
5.2.6.1 Tx Synthesis Options
Several Mt dialogs are modified when RVP900 is equipped with an IFDR that is configured
for Tx waveform synthesis in the Mz menu. See 5.2.7 Mz — Transmissions and Modulations
(page 126) .
When digital Tx waveforms are synthesized, the following questions appear in the
Mt<n>
menu after the
Rx Intermediate Frequency
question.
In this case, each of the RVP900 four pulse widths can select a different type of transmit
waveform and associated matched receiver.
For example, to make it easy for application software such as Ascope to transparently
switch between radically different Tx waveforms by requesting a different pulse width for
each one:
• PW–0 and PW–1 could transmit conventional 0.5 μsec and 2.0 μsec CW pulses that
are received using the bandpass filters.
See
5.2.6 Mt<n> — Triggers for Pulsewidth n (page 116) .
• PW–2 and PW–3 could be configured as 20 μsec and 40 μsec compressed non–
linear FM waveforms.
Tx Waveform
RVP900 supports three standard Tx waveforms:
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