I too am trying to develop an automated DF (stationary nodes) network. I'm considering the traditional APRS RSSI and/or Doppler approach, but had a further thought: If a basic SDR dongle and monitoring app (FM mode) were set up to log a chunk of spectrum, but while using a Doppler antenna system, the doppler would induce an audio tone on ALL logged signals, right? The direction of any logged transmission could be determined after-the-fact?
There's the issue of how to synchronously log the antenna array phase as a reference and the Doppler wavelength spacing limits would have to be observed. (And yes, I understand the issues of using a doppler while stationary ). But implementation details aside, does the basic premise make sense?
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Is your Doppler antenna b asis really large enough to get an audible tone?