User's Manual

RVP8 User’s Manual
October 2005
TTY Nonvolatile Setups
3–8
3.2.2 Mp — Processing Options
Window- 0:User, 1:Rect, 2:Hamming, 3:Blackman : 0
Whenever power spectra are computed by the RVP8, the time series data are
multiplied by a (real) window prior to computation of the Fourier Transform. You
may use whichever window has been selected via SOPRM word #10, or force a
particular window to be used.
R2 Processing- 0:Never, 1:User, 2:Always : 1
Controls R0/R1 versus R0/R1/R2 processing. Selecting ”0” unconditionally disables
the R2 algorithms, regardless of what the host computer requests in the SOPRM
command. Likewise, selecting ”2” unconditionally enables R2 processing. These
choices allow the RVP8 to run one way or the other without having to rewrite the
user code. This is useful for compatibility with existing applications.
Clutter Microsuppression- 0:Never, 1:User, 2:Always : 1
Controls whether individual “cluttery” bins are rejected prior to being averaged in
range. Same interpretation of cases as for ”R2 Processing” above.
2D Final Speckle/Unfold – 0:Never, 1:User, 2:Always : 1
The Doppler parameter modes (PPP, DFT, etc) include an optional 3x3 interpolation
and speckle removal filter that is applied to the final output rays. This 2-dimensional
filter examines three adjacent range bins from three successive rays in order to assign
a value to the center point. Thus, for each output point, its eight neighboring bins in
range and time are available to the filter. Only the dBZ, dBT, Ve l, and Width data are
candidates for this filtering step; all other parameters are processed using the normal
1-dimensional (three bins in range) speckle remover. See Section 5.3.3 for more
details.
Unfold Velocity (Vh–Vl) – 0:Never, 1:User, 2:Always : 0
This question allows you to choose whether the RVP8 will unfold velocities using a
simple (V
high
– V
low
) algorithm, rather than the standard algorithm described in
Section 5.6. Bit-11 of SOPPRM word #10 is the host computer’s interface to this
function when the “1:User” case is selected (See Section 6.3).
Note: This setup question is included for research customers only. The standard
unfolding algorithm should still be used in all operational systems because of its
lower variance. For this reason, the factory default value of this parameter is
“0:Never”.
Process w/ custom trigs – 0:Never, 1:User, 2:Always : 0
This question allows you to choose whether the RVP8 will attempt to run its standard
processing algorithms even when a custom trigger pattern has been selected via the
SETPWF command. Generally it does not make sense to do this, so the default
setting is “0:Never”. Bit-12 of OPPRM word #10 is the host computer’s interface to
this function when the “1:User” case is selected (See Section 6.3).
Use High–SNR 16–bit packed timeseries format: Yes
This parameter provides an additional 6dB of SNR. It can be disabled to provide
compatibility with legacy systems.