Frequency-domain averaging

From Glossary of Meteorology

frequency-domain averaging

A technique for smoothing the statistical fluctuations in power spectra, thus improving the detectability of signals in noise.

Two essentially equivalent techniques can be used on power spectra derived from MN data points:
  1. M spectra each containing N spectral power density points are averaged together in each frequency bin, producing a single averaged N-point spectrum.
  2. The spectral points in a single MN-point spectrum are averaged together in groups of M points, also producing a single averaged N-point power.

    Such techniques are widely used for Doppler spectrum measurements in wind profilers and MST radars.