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Is there a way to reliably distinguish between planes and helicopters using an ADS-B receiver only (no aircraft database)?

I think of using heuristics like "if ground speed > 250 mph then it's a plane", but I would like to find some good heuristics to be sure to identify helicopters correctly.

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ADSB transmits wake vortex information, and TC=4,CA=7 is for rotorcraft.

This is called the "emitter category" by ICAO and some other sources, a rotorcraft is A7.

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