USER’S MANUAL__________________________________________________________________
124 _________________________________________________________________ M211322EN-D
These questions allow you to set the current value and the power–up value
of the receiver noise level for either a single or dual receiver system. The
noise level(s) are shown in dBm, and you may alter either one from the
TTY. The power–up levels are assigned by default when the RVP900 first
starts up, and whenever the RESET opcode is issued with Bit #8 set.
Likewise, the current noise level is revised whenever the SNOISE opcode
is issued. These setup questions are intended for applications in which the
RVP900 must operate with a reasonable default value, up until the time
that an SNOISE command is actually received. They may also be used to
compare the receiver noise levels during normal operation, which serves as
a check that each FIR filter is behaving as expected when presented with
thermal noise.
Transmitter phase switch point: -1.00 usec
This is the transition time of the RVP900 phase control output lines during
random phase processing modes. The switch point should be selected so
that there is adequate settling time prior to the burst/COHO phase
measurement on each pulse. This question only appears if the PHOUT[0:7]
lines are actually configured for phase control (see Section 4.2.1 Mc —
Top Level Configuration on page 104).
Limits: -500 µsec to 500 µsec
Polarization switch point for POLAR1: -1.00 usec
Polarization switch point for POLAR2: 1.00 usec
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, the
transition points of these control signals are set by these two questions. The
values are in microseconds relative to range zero; the same units used to
define the start times of the six user triggers. The logical sense of the
polarization output lines is set by optionally inverting the signals in
softplane.conf.
Limits: -500 µsec to 500 µsec
4.2.5.1 Special Options for Tx Synthesis
Several of the dialogs described in the previous section are modified when
the RVP900 is equipped with an IFDR is configured for Tx waveform
synthesis in the Mz menu. In this case, each of the RVP900 four pulse
widths can select an entirely different type of transmit waveform and
associated matched receiver.
For example, PW–0 and PW–1 could transmit conventional 0.5 µsec and
2.0 µsec CW pulses that are received using the bandpass filters described
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