RVP900 can optionally begin hunting for a missing burst pulse immediately after being
reset, but before any activity has been detected from the host computer. This might be
useful in systems that both drift a lot and generally have their transmitter on. However, this
option is included as a work around; the correct way for a burst pulse hunt to occur is
through an explicit request from the host computer which "knows" when the pulse really
should be present. Blindly hunting cannot be done because there are many reasons why the
burst pulse may legitimately be missing, for example, during a radar calibration.
Automatically hunt immediately after being reset: YES Repeat auto hunt every:
60.00 sec
When the feature is enabled, the automatic hunt for the burst pulse always runs at least
once. The automatic hunting ceases when any activity is detected from the host computer.
Only use this feature on radars with a serious drift problem in burst pulse timing.
If automatic hunt is enabled, the processor adjusts the value of the calibration
reflectivity
(Z0) to compensate for long term changes in the transmit power. We do this by assuming
that the burst pulse power is proportional to the transmit power. During calibration, we
record the burst pulse power. If this number is available and provided to RVP900 at
processing time, then the processor can notice the dierence and adjust the calibration. The
burst pulse power must be above the Minimum power for valid burst pulse
value
specified above. The calibration changes are done only at the beginning of a
processing mode change, which means once per task in IRIS.
The corrected calibration reflectivity numbers to do this are stored with the time series. To
apply the correction, turn on the OPTS_ZCAL flag in the SOPRM command. See XARG 6 in
8.4 Setup Operating Parameters (SOPRM) (page 239).
Enable burst power based correction of Z0: NO
Simulated Burst Samples
RVP900 can simulate a 1 µsec envelope of burst samples. Use this as a testing and teaching
aid only. Never use this in an operational system.
A two–tone simulation is produced when RVP900 is in dual–receiver mode. The pulse is the
sum of 2 transmit pulses at the primary and secondary intermediate frequencies. To make
the simulation more realistic, the signal strengths are unequal - the primary pulse is 3 dB
stronger than the secondary pulse.
Simulate burst pulse samples: NO
The simulated burst responds to AFC like a real radar. The following parameter defines the
frequency span from minimum AFC to maximum AFC.
RVP900 User Guide M211322EN-J
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