Chapter 5 _______________________________________________________ Plot-Assisted Setups
VAISALA______________________________________________________________________ 173
This waveform was designed using the "$" automatic search-and-optimize
command in the Pa menu. For a given pulse length and bandwidth of the
Tx waveform, this command allows you to try thousands of combinations
of FM shape and amplitude shape, searching for the combination 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.
5.6.2 Available Subcommands Within Pa
The list of subcommands is printed on the TTY:
Available Subcommands within 'Pa':
These subcommands change the bandwidth, pulsewidth, and shaping
parameters of the transmit waveform, and alter the format of the display.
S/s & L/l Pulse Length Shorter/Longer
N/n & W/w Bandwidth Narrower/Wider
1/2/3 Select Tuning Parameter to Change
D/d & U/u Selected Tuning parameter Down/Up
V/v Doppler Frequency Shift Up/Down
Z/z Amplitude Zoom
$ Search for Optimal Waveform
S/s & L/l The "Shorter" and "Longer" commands decrease or
increase the time duration (that is, pulsewidth) of the
transmitted pulse. The lower case commands shift in
0.05 µsec steps, while 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, while the
upper case commands use 200KHz steps.
1 & 2 & 3 Typing one of these numbers chooses which of the three
waveform tuning parameters will be altered by the "D"
and "U" keys.
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