Table 41 Pa Subcommands
Command Description
S/s & L/l
The shorter and longer commands decrease or increase the time duration (that is, pulse
width) of the transmitted pulse.
The lower case commands shift in 0.05 μsec steps.
The upper case commands use 1 μsec steps.
N/n & W/w
The narrower and wider commands decrease or increase the bandwidth of the
transmitted pulse.
The lower case commands shift in 10KHz steps.
The upper case commands use 200 KHz steps.
1/2/3
Type one of these numbers to choose which of the 3 waveform tuning parameters are
altered by the D and U commands.
D/d & U/u
Decrease or increase the waveform tuning parameter that has been chosen by the most
recent 1, 2, or 3 command.
The lower case commands shift in 0.001 (dimensionless) steps.
The upper case commands use 0.05 steps.
Present values of all 3 parameters are printed each time a Down/Up key is pressed, for
example:
Tuning parameters: 0.9000 1.0000 0.1770
See 5.2.6.1 Tx Synthesis Options (page 122).
V/v
Shows how the overall compressed pulse Tx/Rx system responds to the eects of
target Doppler shift.
You can introduce frequency shifts as large as 100 KHz in order to see their eect on
the Range/Time side lobes.
The Pa plot shows the eects 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 side lobe plot is 80dB. Usually this gives plenty of room to
examine the properties of the waveform.
For very wide dynamic range pulses, you can shift the plot up/down in 10dB steps using
this command.
$
Designs an optimal compressed waveform.
For a given pulse width and bandwidth of the Tx waveform, you can try 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.
$ Command
The following dialog appears in response to the $ command:
Chapter 6 – Plot-assisted Setups
163
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