USER’S MANUAL__________________________________________________________________
334 _________________________________________________________________ M211322EN-D
7.31 Define PRF Pie Slices (PRFSECT)
This command supplements the SETPWF command (Section 7.14 Set
Pulse Width and PRF (SETPWF) on page 311) and allows an
alternatetrigger PRF to be generated within prescribed AZ/EL sectors. As
many as eight different trigger sectors can be defined by invoking
PRFSECT for each separate region. The trigger pattern will then
automatically change whenever the antenna enters any of these regions,
but the timeseries data will remain continuous and uninterrupted
throughout each change. The motivation behind PRFSECT is that it allows
a complete volume scan to run with PRFs that have been optimized to the
radar echoes in all directions. Some caveats should be observed:
- Dual-PRF unfolding can not possibly work properly at PRF sector
boundaries, so we recommend not using Dual-PRF and PRFSECT at
the same time.
- When PRF sectors are used in conjunction with angle sync'ing, it is
best to set the PRF sector boundaries at the midpoint between
individual sync angles. This will prevent the PRF seam from bobbling
between two adjacent sync angles.
The SETPWF opcode completely erases any alternate sectors that have
been setup so far. Thus, the PRFSECT command can only be used after
SETPWF has established the pulsewidth and default trigger rate for the
entire AZ/EL scan volume.
0916-180
The following four arguments define a solid sector in azimuth and
elevation within which the alternate trigger pattern will be used in
preference to the default (SETPWF) pattern. When the current AZ/EL
angle pair is contained in more than one defined sector, then the trigger
pattern from the lower numbered sector will be used. Note that the sector
bounds are inclusive, that is, they include the Upper/Lower AZ/EL
Sector Selects which sector number is being defined to have an
alternate trigger pattern. This is simply an arbitrary index
from 0-7.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| | 0 0 0 1 1 0 0 1 1 1 1 1 | Command
|_______________|_______________________________________________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| | Sector | Input 1
|___________________________________________________|___________|
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