Array gain and reduction of self-noise
Abstract—Because an array is composed of many sensors, each making an independent measurement of the wavefield, intelligent combination of the sensor signals should lead to an overall increase in the signal-to-noise ratio. What we are trying to achieve is enhancing the signal with an array beyond what is possible with a single sensor. The array gain measures an array’s signal-to-noise ratio enhancement, and thus also the self-noise improvement of the total array.
Index Terms—Array gain, self-noise, signal-to-noise ratio, delay-and-sum beamforming