WW2010
University of Illinois

WW2010
 
welcome
 
online guides
 
archives
 
educational cd-rom
 
current weather
 
about ww2010
 
index

Online Guides
 
introduction
 
meteorology
 
remote sensing
 
reading maps
 
projects, activities

Remote Sensing
 
introduction
 
radars
 
satellites

Radars
 
introduction
 
radar basics
 
imagery
 
velocity patterns
 
applications

Radar Basics
 
radar signals
 
wave properties
 
signal scattering
 
wavelength effects
 
ray paths
 
clear air returns
 
target location
 
scanning modes
 
radial velocity

User Interface
 
graphics
text

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Wave Properties
wavelengths and phase shifts

The wavelength ([Image: ] ) of a wave is the distance from one crest to the next.

The phase of a wave, measured in degrees, where 360 degrees is one wavelength, indicates the current position of the wave relative to a reference position. For example, if at time T1 the position of the wave along the vertical line was:

while at time T2, the position of the wave was:

then the wavelength did not change from T1 to T2, but the wave's position relative to the vertical line changed 1/4 wavelength, or 90 degrees. This change is called a "phase shift".



radar signals
Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.

signal scattering