Wind turbines as distorting scattering objects for radar - clutter aspects and visibility

Wind turbines WT are planned to be constructed often close to radar systems, e.g. air traffic control, air defense, weather radar. The WT are scatterers and may affect the radar operation in-acceptably. The WT are a clutter problem and are not false targets as sometimes treated if the WT are visible to the radar. Clutter characteristics are presented and discussed.