USER’S MANUAL__________________________________________________________________
110 _________________________________________________________________ M211322EN-D
Process w/ custom trigs – 0:Never, 1:User, 2:Always : 0
This question allows you to choose whether the RVP900 attempts to run
its standard processing algorithms, even when a custom trigger pattern has
been selected through the SETPWF command. Generally, it does not make
sense to do this, so the default setting is "0:Never". Bit–12 of SOPRM
word #10 is the host computer's interface to this function when the
"0:Never" case is selected (see Section 7.3 Setup Operating Parameters
(SOPRM) on page 259).
Use High–SNR 16–bit packed timeseries format: Yes
This parameter provides an additional 6 dB of SNR. It can be disabled to
provide compatibility with legacy systems.
Minimum freerunning ray holdoff: 100% of dwell
This parameter controls the rate at which the RVP900 processes free–
running rays. This prevents rays from being produced at the full CPU limit
or I/O limit of the processor (whichever was slower); which could result in
highly overlapping data being output at an unusably fast rate. This
behavior only occurs when running without angle syncing, such as during
IRIS Manual and RHI scans.
To make these free–running modes more useful, you may establish a
minimum holdoff between successive rays, expressed as a percentage of
the number of pulses contributing to each ray. Choosing 100% (the default)
produces rays whose input data do not overlap at all, that is, whose rate is
exactly the PRF divided by the sample size. Choosing 0% gives the
unregulated behavior in which no minimum overlap is enforced and rays
may be produced very quickly.
Limits: 0 to 100%
Linearized saturation headroom: 4.0 dB
The RVP900 uses a statistical saturation algorithm that estimates the real
signal power correctly even when the IF receiver is overdriven (that is, for
input power levels above +4 dBm). The algorithm works quite well in
extending the headroom above the top end of the A/D converter, although
the accuracy decreases as the overdrive becomes more severe. This
parameter allows you to place an upper bound on the maximum
NOTE
This setup question is included for research customers only. The
improved unfolding algorithm should still be used in all operational
systems because of its lower variance. The Vaisala radar (IRIS) and
ascope applications upload the improved unfolding method ("0:Never").
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