Radar Meteorology Glossary
This glossary will be the main reference for radar products and problems and will give details on what the different products are and how they are used.
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A 10 centimetre wavelength radar.
The volume in which the radar data for one range bin are measured. Defined by the width of the radar beam (app. 1°) and half the length of the transmitted pulse. 1 µs pulses are 150 m deep, 2 µs pulses are 300 m deep.
Upper limit of dynamic range above which an increase in the input signal produces no detectable change in the output.
A volume scanning procedure designed for the surveillance of one or more particular meteorological phenomena.
Sea clutter is a specific form of spurious echo feature. The main reason of its formation is anomalous propagation of partial radar beam above water bodies, i.e. ducting. Sea clutter can be treated by identifying multiple modes of the reflictivity spectrum and then treating each mode differently.
Ships in radar images
Secondary energy maximum located outside the radar beam. Typically contains a small percentage of energy compared to the main lobe.
Specific differential phase shift
The Specific Differential Phase KDP denotes the difference between the propagation constant for the horizontally and vertically polarized wave. In a homogeneous medium KDP can be directly obtained from the differential phase shift φDP at two different locations.
Notes• KDP is only affected by anisotropic hydrometeors (rain) and therefore KDP allows to discriminate between rain and frozen precipitation.