SAM doesn't cause RWR warnings

Simple logic:

SAM is a mode that combined RWS with STT. It does so by interrogating a target like in STT for an amount of time (t %) and then commands a RWS of the surrounding area for (1-t %) of the time.

Let's assume for the sake of argument that it's 50/50.

Now the math is simple:

You transmit something with a steady power, and the resulting energy at range is dimished by the square for each increase in range. ( https://en.wikipedia.org/wiki/Inverse-square_law )

Lets have an example of just the STT portions of radar energy at different distances:

The unit of power doesn't matter as this is just comparative.

STT (100% duty cycle)

+---------------+----------------+------------+--------------------------+-------------+
| distance (nm) | received power | duty cycle | received power (average) | RWR in DCS  |
+---------------+----------------+------------+--------------------------+-------------+
|             1 |      1.000.000 | STT (100%) |                1.000.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             2 |        250.000 | STT (100%) |                  250.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             3 |        111.111 | STT (100%) |                  111.111 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             4 |         62.500 | STT (100%) |                   62.500 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             5 |         40.000 | STT (100%) |                   40.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             6 |         27.778 | STT (100%) |                   27.778 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             7 |         20.408 | STT (100%) |                   20.408 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             8 |         15.625 | STT (100%) |                   15.625 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             9 |         12.345 | STT (100%) |                   12.345 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|            10 |         10.000 | STT (100%) |                   10.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+

Now for SAM with 50% duty cycle

+---------------+----------------+------------+--------------------------+-------------+
| distance (nm) | received power | duty cycle | received power (average) | RWR in DCS  |
+---------------+----------------+------------+--------------------------+-------------+
|             1 |      1.000.000 | SAM  (50%) |                  500.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             2 |        250.000 | SAM  (50%) |                  125.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             3 |        111.111 | SAM  (50%) |                   55.556 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             4 |         62.500 | SAM  (50%) |                   31.250 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             5 |         40.000 | SAM  (50%) |                   20.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             6 |         27.778 | SAM  (50%) |                   13.889 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             7 |         20.408 | SAM  (50%) |                   10.204 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             8 |         15.625 | SAM  (50%) |                    7.813 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             9 |         12.345 | SAM  (50%) |                    6.173 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|            10 |         10.000 | SAM  (50%) |                    5.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+

And now mix it and sort by received power (average):

+---------------+----------------+------------+--------------------------+-------------+
| distance (nm) | received power | duty cycle | received power (average) | RWR in DCS  |
+---------------+----------------+------------+--------------------------+-------------+
|             1 |      1.000.000 | STT (100%) |                1.000.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             1 |      1.000.000 | SAM  (50%) |                  500.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             2 |        250.000 | STT (100%) |                  250.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             2 |        250.000 | SAM  (50%) |                  125.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             3 |        111.111 | STT (100%) |                  111.111 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             4 |         62.500 | STT (100%) |                   62.500 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             3 |        111.111 | SAM  (50%) |                   55.556 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             5 |         40.000 | STT (100%) |                   40.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             4 |         62.500 | SAM  (50%) |                   31.250 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             6 |         27.778 | STT (100%) |                   27.778 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             7 |         20.408 | STT (100%) |                   20.408 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             5 |         40.000 | SAM  (50%) |                   20.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             8 |         15.625 | STT (100%) |                   15.625 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             6 |         27.778 | SAM  (50%) |                   13.889 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             9 |         12.345 | STT (100%) |                   12.345 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             7 |         20.408 | SAM  (50%) |                   10.204 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|            10 |         10.000 | STT (100%) |                   10.000 | beepbeepbeep|
+---------------+----------------+------------+--------------------------+-------------+
|             8 |         15.625 | SAM  (50%) |                    7.813 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|             9 |         12.345 | SAM  (50%) |                    6.173 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+
|            10 |         10.000 | SAM  (50%) |                    5.000 |    silent   |
+---------------+----------------+------------+--------------------------+-------------+

Now this doesn't sound right.

tables fixed.

Fixed tables...

+1 If I'm not mistaken, the STT portion of SAM mode should trigger a lock-warning (where's beamscanner when you need him?).

Not saying you are wrong, but the duty cycle of a waveform is determined by the PRF, not whether it's in a scanning or tracking mode. In either it's still a pulsed signal at a certain PRF or set of PRFs so the duty cycle will be below 100%.

I think the term you are looking for is dwell time.

Track file added for an STT lock that generates a warning on both sides.

Then the SAM lock doesn't generate a warning all the way in.

Also in this track file are the famous defects:

- Helmet boresight ACM is broken

- My car distance beeper reacts quicker than my scan modes

- My FPM goes up and down when changing speed

TAW_PG_TOP_GUN_DGF_v1.2-20200519-003931.trk

Not saying you are wrong, but the duty cycle of a waveform is determined by the PRF, not whether it's in a scanning or tracking mode. In either it's still a pulsed signal at a certain PRF or set of PRFs so the duty cycle will be below 100%.

 

I think the term you are looking for is dwell time.

Dwell time! Yes! Precisely! Thank you!