mean Doppler velocity
From Glossary of Meteorology
The mean velocity in the Doppler spectrum; that is, the first moment of the Doppler spectrum expressed in terms of velocity.
In radar, the power spectrum of the complex signal, expressed as a function of Doppler frequency or Doppler velocity. Denoted by S(v), it may be thought of as the reflectivity- weighted radial velocity distribution of the scatterers in a distributed target.