15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| | Bits for –142.22 usec | Input 2
|----------------------------------------|-----------------------|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| | Bits for zero range | Input 1025
|----------------------------------------|-----------------------|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
---------------------------------------------------------------
| | | | | | | | | | | | | | | | |
| | Bits for +142.08 usec | Input 2049
|----------------------------------------|-----------------------|
8.14 Define Pulse Width Control and PRT
Limits (PWINFO)
RVP900 can control the radar transmitter's pulse width and corresponding receiver
bandwidth.
There are 16 pulse/bandwidth codes, numbered 0 ... 15. The association between codes and
pulse widths is determined by the needs and capabilities of each radar. In some cases, code
0 can represent 0.25 microsecond pulse width, and in other cases it can represent 2.0
microseconds, and some radars may use all sixteen codes while others provide fewer
options.
The PWINFO command
defines what happens for each pulse width code. SETPWF defines
selects which code is used.
The PWINFO command loads four codes at a time according to the UpperPW bits: 00 loads
codes 0 ... 3, 01 loads codes 4 ... 7, and so on.
RVP900 drives four TTL output lines (PWBW0 – 3) which control the radar pulse/
bandwidth hardware. Typically this control is through relays or solid-state switches in the
transmitter and receiver. The user decides what state the four lines assume for each pulse
width code using word #1 following the command, which contains four codes packed into
one 16-bit word. The power-up default is to drive output line N low for a code of N, keeping
all other lines high (Input of 7BDE Hex). The
flexibility in defining the output bits usually
makes the radar hardware connections very simple. For example, if pulse width selection
relied on choosing one of four relays, then each PWBWn line could serve directly as a relay
driver using the default pattern.
RVP900 User Guide M211322EN-J
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