PARSAX An Informal Look at Radar Technology and Applications within TU Delft


Scanning Radar – Interpretation of the Doppler Velocity Patterns

Occasionally found quite old, but very clever presentation "Interpreting Doppler Velocity Patterns" (2000) by Dr. Ronald E. Rinehart from University of North Dakota, which is based on even older (1983, 1987) reports of Rodger A. Brown and Vincent T. Wood from the National Severe Storms Laboratory, NOAA, Norman, Oklahoma. The best way to view this on-line slide show, created in the beginning of this century, is still to use Internet Explorer. But the presentation explains to you, for example, what spatial structure of wind field is responsible for this unusual pattern and what type of meteorological phenomena can produce such wind-field.

 Misterious Pattern of Doppler Velocity

Brief explanation for those who still did not understand experimental setup. The radar with narrow antenna pattern (pen-like) rotates in horizontal plane and measure Doppler velocity. It is assumed that full interval of observation is homogeneously filled with some kind of reflectors (e.g. rain drops), which are moving by wind. The wind (or, more precisely, its amplitude and direction) is a function of height and position on azimuthal plane. The problem to solve is: to sketch the pattern of wind directions and the vertical profile of wind amplitude using presented measured Doppler pattern.

On practice such mysterious pattern, probably, not often can be observed using middle range radars like PARSAX and IDRA, but... Anyhow, the study and analysis of such patterns can be a good practice in understanding and interpretation of radar observations.

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