Any reasonable priced (sub 20$/100) ways to directly measure indoors velocities between around 0.1 and 15m/s?
Its main purpose would be to reduce speed drift for a 9DOF device (acc/gyro,magnetometer), so I believe only 1D will do.
Now since it's for indoor use, a GPS won't help. I assume this could be done measuring RF/ultrasonic doppler shift, but I don't know how this is measured, nor have I found dedicated chips to do it.
Answer
I suspect that a Gunnplexer as used in Police RADARs and in door openers prior to PIR's taking over would do what you want. Output is Doppler difference of go + motion affected return signal.
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A few examples:
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