# Doppler spectrum

From AMS Glossary

## Doppler spectrum

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.That is, where is the mean received power as defined by the radar equation.

*S*(*v*)*dv*denotes the received power in the velocity interval*dv*. With this definition,*S*(*v*) is normalized such that