Vaisala RVP900

Chapter 4 _____________________________________________________ TTY Nonvolatile Setups
VAISALA______________________________________________________________________ 109
R0/R1/R2 Processing– 0:Never, 1:User, 2:Always : 1
Controls whether R0/R1/R2 or R0/R1 estimates are used to compute the
spectrum width (see Section 6.3.5 Spectrum Width Algorithms on page
219). Selecting "0" unconditionally disables the R2 algorithms, regardless
of what the host computer requests in the SOPRM command. Similarly,
selecting "2" unconditionally enables R2 processing. Bit-7 of SOPRM
word #2 is the host computer's interface to this function when the "1:User"
case is selected (see Section 7.3 Setup Operating Parameters (SOPRM) on
page 259). The Vaisala radar application (IRIS) uploads R0/R1/R2.
Ascope uploads the button "R2 algorithms" setting in the block Gen Setup.
At RVP900 startup, the user setting is retrieved from
rvp9NV.opprm.iflags.
Clutter Microsuppression– 0:Never, 1:User, 2:Always : 1
Controls whether "cluttery" bins are rejected prior to being averaged in
range. Bit-8 of SOPRM word #2 is the host computer's interface to this
function when the "1:User" case is selected (see Section 7.3 Setup
Operating Parameters (SOPRM) on page 259). The functionality is
dependent on the application settings for CCOR thresholds, in addition
(see Section 6.3.2 Range Averaging and Clutter Microsuppression on page
215). The Vaisala radar application (IRIS) requests for Clutter
Microsuppression. Ascope uploads the button "Clutter Microsuppression"
setting in the block Gen Setup.
PPP autocorels from DFTs – 0:Never, 1:User, 2:Always : 1
When autocorrelation terms are computed from power spectra, the results
differ from a strict time-domain calculation in that an “end-around” term
is introduced as a result of circular rather than linear convolution.
Requesting PPP-style autocorrelations correct this spurious term when the
computations are done through DFTs. Bit-11 of SOPRM word #10 is the
host computer's interface to this function when the "1:User" case is
selected (see Section 7.3 Setup Operating Parameters (SOPRM) on page
259). The Vaisala radar application (IRIS) does not request PPP-style
autocorrelations, while the ascope requests it. At RVP900 startup, the user
setting is retrieved from rvp9NV.opprm.iflags.
Unfold Velocity (Vh–Vl) – 0:Never, 1:User, 2:Always : 0
This question allows you to choose whether the RVP900 unfolds velocities
using a simple (V
high
– V
low
) algorithm, rather than the improved algorithm
described in Section 6.7 Dual PRF Velocity Unfolding on page 240. Bit–
11 of SOPRM word #10 is the host computer's interface to this function
when the "1:User" case is selected (see Section 7.3 Setup Operating
Parameters (SOPRM) on page 259).