Precipitation Occurrence Sensor System

The Precipitation Occurrence Sensor System, POSS: This is a bistatic, X-band, Doppler radar, designed by Environment Canada. The POSS measures a signal whose frequency is proportional to the raindrop Doppler velocity, and whose amplitude is proportional to the raindrop diameter. The volume of sampling for the three instruments is very different. However, their observations are all consistent to each other.

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