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The velocity variations have three slightly different origins
- the diurnal variation due to the earth rotation. The maximum value is
in 12 hours.
- the yearly variation due to earth orbital motion. The order of
magnitude is for two months, with a maximum
value of for 6 months
- the source velocity. Typical value is for
Accordingly, the following frequency and velocity differences are induced
at 95 GHz USB (harmonic number 50) in the three cases :
Note that the frequency shifts do not depend on the observing frequency.
- Earth rotation : maximum
- Earth orbit : typical
- Source to source :