@tdracer
Bingo! Making a pressure probe that won't ice isn't that hard - you can put as much heat into it as you want (and pretty much anywhere on the probe you want) without significantly affecting the measurement.
I agree, but with one caveat - it shouldn't be hard provided that the design requirements are known. The problem has been, so far as I can see, that nobody has been able to describe the characteristics of the ice particles with enough certainty to define a foolproof requirement. Since 1996 the FAA have had a working group trying to do just that, interestingly their motivation was a series of engine power loss events not airspeed probes. A good summary of the situation can be found in AIAA 2006 - 206; The Ice Particle Threat to Engines in Flight.