Set pulse width and PRF (SETPWF)
SETPWF selects the pulse width and trigger rate.
A 4-bit pulse width code is passed in bits
(13, 12, 9, 8) of the
command word, and selects one of 16 pulse widths as described under PWINFO. The new radar PRT is passed in word #1. For all
processing modes that use a fixed trigger rate, this value defines the trigger period that is
output at all times except during noise measurements. For Dual-PRF applications, this word
defines the short period (high PRF) rate. The long period is internally computed as either
3/2, 4/3, or 5/4 the short period, and the trigger generator alternates between the short and
long rates on each successive ray.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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| | | | | | | | | | | | | | | | |
| |UpperPW| (Rsv) |LowerPW| | 1 0 0 0 0 | Command
|---------------|-------|---|---|------------|-------------------| UpperPW- Upper two bits of overall 4-bit pulse width selection
LowerPW- Lower two bits of overall 4-bit pulse width selection
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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| | | | | | | | | | | | | | | | |
| Desired Trigger Generator Period (0.16667usec Increments) | Input 1
|----------------------------------------------------------------| When Input #1 is zero, the
arguments take on an alternate form that allows an array of N (up to 64)
trigger periods to be specified, and also gives much finer time resolution in the choice of
each period. The XARGS command is first used to load an array of
N 32-bit words that define the trigger period(s) in nanoseconds. RVP10
generates triggers with shapes (relative starts and widths) are identical for each pulse, but
whose periods follow the selected sequence. Trigger patterns such as these are intended to
support research customers who use the real-time
(I,Q) data stream directly.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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| | | | | | | | | | | | | | | | |
| Lower 16–Bits of 32–Bit Trigger Period in Nanoseconds | XARG 1
|----------------------------------------------------------------| 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| Upper 16–Bits of 32–Bit Trigger Period in Nanoseconds | XARG 2
|----------------------------------------------------------------|