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