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RMS Calculator
Heterodyne receivers By entering the atmospheric temperature (some 10 degrees below the ground temperature at Chajnantor),the (average) elevation of the source, the receiver temperature, an on-source integration time ,and the spectral resolution, the σ (in K) can be estimated.See the observing time calculation page for details. To use a coarser vel. resolution Δvnew than selectable multiply the resulting σ with sqrt(Δv/Δvnew). The total time is calculated assuming toff=ton and a system observing efficiency of 0.4, i.e. ttotal=(ton + toff)/0.4. The RMS estimation use the ton
Frequency [GHz]
Redshift Z
Sky Frequency [GHz]
Trec[K]
PWV [mm H2O]
Tatm [K]
Zenith opt depth
Source elevation [deg]
tint ON [sec]
FFTS [Number of channels]
Vel. resolution Δv [km/s]
Tsys [K]
Position switching σ [K]
Beam switching σ [K]
     

 

OTC Calculator
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Last update: May 24th, 2015 		[Home]