Chapter 5 _______________________________________________________ Plot-Assisted Setups
VAISALA______________________________________________________________________ 147
5.3.2 Available Subcommands Within Pb
The list of subcommands is printed on the TTY:
Available Subcommands within 'Pb':
These subcommands change the matched filter's impulse response length,
shift the radar triggers, and alter the format of the display.
I/i Impulse response length Up/Dn
A/a & S/s Aperture & Start of AFC window
L/l & R/r Shift triggers left/right
T/t Plot time span Up/Dn
Z/z Amplitude zoom
> and <
Start/Stop logging to rvp9-pb.log
% Toggle between IF input channels
B/b BP Tracking On/Off (temporary)
+ Hunt for missing burst
- Single Step
I/i The I command increments or decrements the length of the
matched filter's impulse response. Each keystroke raises or
lowers the FIR length by one tap.
A/a & S/s These commands raise/lower the aperture/start of the
subwindow of burst pulse samples for AFC. If you never
use these commands, the full FIR window is used;
however, shortening the AFC interval results in two sample
windows being drawn on the plot. The smaller AFC
window should be positioned into the center portion of the
transmitted pulse, where the burst amplitude and frequency
are fairly stable.
L/l & R/r These two commands shift the entire group of RVP900
triggers left or right (earlier or later in time). The lowercase
commands shift in 0.025 µsec steps, and the uppercase
commands shift in 1.000 µsec steps (approximately). The
reason for shifting all six triggers at once is that the relative
timing among the triggers remains preserved. However, the
absolute timing (relative to range zero) varies, and this
causes the burst pulse A/D samples to move within the
sample window.
T/t The T command increments or decrements the overall time
span of the plot. The available spans are 2, 5, 10, 20, 50,
100, 200, 500, 1000, 2000, and 5000 microseconds. The
value is reported on the TTY as "PlotSpan".
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