Single Doppler Radar Wind Retrieval (vad) Technology

The key development of the wind retrieval technique is the application of Doppler radar data. A Doppler radar only measures the component of the velocity in the line of sight, the so-called radial velocity. Radial velocity data is not straightforward to interpret, some further processing is required before it can be presented to users. And structure of the wind field which we obtained with Doppler radar is not the real wind field; it should be converted into two or three-dimension wind field through some methods.Chapter one in this paper gives brief applications of Doppler radar, analyses the techniques of wind retrieval; The Second part introduce the methods of Dealiasing; Using VAD technique, the environmental wind can be extracted. During actual operation, there are two kinds of practice strategies, one is single-elevation VAD method, and the other is multi-elevation VAD method. There are different between those two methods. Self-adjust elevation VAD methods proposed combine the merits of front two methods. Those methods are discussed in the third part to find out the different, and self-adjust elevation VAD methods can get more valuable wind information.The changes of mean wind from low-level to high-level can be show from VAD technique. We can get the mean wind of certain level only, but no the distributing at different azimuth .So we maybe ignored some local -system. If we want to know the distribution of wind, we could use Velocity Azimuth Processing (VAP) method or Uniform Wind (UW) technique etc. to get the two-dimensional wind field. Finally experimentation to retrieval two-dimensional wind field using UW technique was carried out It is showed mat wind character can be extracted through this method...