Next: Tracked observations
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Switching is done in two main ways.
Moreover, there are two main observation kinds.
- Position switch
- where the off-measurement is done on a close-by sky
position devoid of signal. Wobbler switching is a particular case.
- Frequency switch
- where the telescope always points towards the the
source and the switching is done in the frequency (velocity) space.
- Tracked observations
- where the telescope track the source, i.e. it
always observes the same position in the source referential. The result
is a single spectra.
- On-The-Fly observations
- where the telescope continuously slew
through the source with time to map it. The result is a cube of spectra.
In the following, we will work out the equations needed by the
time/sensitivity estimator for each combination.