Coherent Doppler Lidar (CDL) for Measuring Wind with Transmission of Frequency-Modulated Pulse or Continuous Wave

Coherent Doppler lidar (CDL) for measuring wind by transmitting frequency-modulated pulse or continuous wave was proposed and demonstrated. A theoretical study showed that, while typical CDL uses single-frequency short-duration pulse by which distance and velocity resolutions are in a trade-off relationship, the new CDL allows us to specify the two resolutions independently. By using a prototype which can work as both typical and new CDLs, observations to clear or cloudy sky were carried out. Analyses of the observed data revealed that the independency was realized. Specifically, about five times finer velocity resolution than typical CDL was confirmed with no sacrifice of distance resolution.