## Radiometer Sensitivity

The expected r.m.s. noise can be calculated using the
following equation:
K * Tsys
RMS = -----------------
sqrt(BW * Teff)
where,
RMS = r.m.s. sensitivity [K]
K = 1.12 (NRAO Model IV Autocorrelator)
Tsys = system temperature [K]
BW = bandwidth [Hz]
Teff = effective integration time [s]
Ton*Toff
Teff = -----------
Ton + Toff
A general rule of thumb is
pi * Tsys
RMS = -------------------------
sqrt(2) * sqrt(BW * Ttot)
where
pi = 3.14
Ttot = total integration time [s]; assuming total power
position switching, i.e., on source half the time.