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'''Doppler Error'''
 
</dt><BR/>In using [[Doppler Radar|Doppler 
radar]], the error in the measurement of target [[Radial Velocities|radial 
velocities]] due to atmospheric refraction. Compare [[Range Error|range 
error]], [[Azimuth Error|azimuth 
error]]. 
</dd><BR/>''These errors result from (a) the assumption of a constant wave velocity 
for a nonhomogeneous atmosphere and (b) the refraction or bending of the rays 
such that the ray path does not coincide with the geometrical straight line 
between the target and the radar. Errors due to (a) are of no practical 
importance, and, as in the case of elevation-angle error, the effects due to 
(b) are negligible except for elevation angles near the horizontal. ''
</dd>
==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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