### Radiometric equation

The radiometric equation (eq. 11) gives the thermal noise as a function of observing bandwidth , integration time , for an array with antennas, where is the geometric surface of an antenna and is the aperture efficiency. It also depends on the correlator efficiency and the phase decorrelation factor .

For a baseline, we have the following noise equation:

| (10)

The array point source sensitivity is given by:

| (11)