Doppler Concepts

  • components of a wave
    • wavelength
    • amplitude
    • phase
  • Pulse-pair method for determining radial velocities
  • nyquist velocity/interval
  • velocity folding
  • relationship between nyquist interval and PRF
  • relationship between nyquist velocity and unambigous range
  • Power spectrum
    • how to determine radial velocity and reflectivity from spectrum
    • factors governing width of spectra
    • information on scatterers based on spectral width data
    • difference between rain and snow
  • vads:
    • assumptions made
    • sampling in a cone
    • adv/disadv of big/small cones
  • Dual-Doppler technique:
    • number of radars required
    • optimal geometry
    • assumptions made
    • calculation of horizontal winds
    • calculation of vertical winds