USER’S MANUAL__________________________________________________________________
174 _________________________________________________________________ M211322EN-D
D/d & U/u The "Down" and "Up" commands decrease or increase
the waveform tuning parameter that has been chosen by
the most recent "1", "2" or "3" key. The lower case
commands shift in 0.001 (dimensionless) steps, while
the upper case commands use 0.05 steps. Present values
of all three parameters will be printed each time a
Down/Up key is pressed, for example:
Tuning parameters: 0.9000 1.0000 0.1770
Please see Special Options for Tx Synthesis on page
123 for a description of how each of the tuning
parameters are used.
V/v The "Velocity" command allows you to investigate how
the overall compressed pulse Tx/Rx system will
respond to the the effects of target Doppler shift.
Frequency shifts as large as 100KHz can be introduced
in order to see their effect on the Range/Time sidelobes.
The Pa plot will show the effects of +V and V shifts as
green and yellow plots in addition to the standard white
(zero Doppler) plot.
Z/z The dynamic range of the Pa sidelobe plot is 80dB.
Usually this will give plenty of room to examine the
properties of the waveform. But for very wide dynamic
range pulses, you can shift the plot up/down in 10dB
steps using these "Zoom" keys.
$ Designs an optimal compressed waveform. For a given
pulsewidth and bandwidth of the Tx waveform, this
command allows you to try many thousands of
combinations of FM shape and amplitude shape,
searching for the one that minimizes the sum of PSL
and ISL (in dB). This gives the best overall waveform
for weather radar observations in which both the PSL
and ISL are important.
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