[ASA Vet]

The location of the transmitter (AWACS, etc.)

Since that platform is a transmitter, it could also be located by a passive receiver tuned to it's radar frequency.
That receiver site would need to be able to adjust frequencies quickly,
and be able to send it's results in realtime.

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That receiver site would need to be able to adjust frequencies quickly, and be able to send it's results in realtime.

Like a police scanner attached to a P200. that ought to be plenty fast. Multiple scanning receivers might work too. It would not take much computing power to compost all the data.