1. A method for calibrating parameters of sensor elements in a sensor array, comprising: receiving an output signal of at least two sensor elements signal in reaction to an input signal from a signal source; estimating a cross-correlation between the output signals of at least two of said sensor elements; optimising a difference between the estimated cross-correlation and a cross-correlation model; and thereby estimating said parameters from the optimised difference; wherein a cross-correlation model is used as represented by the mathematical equation: 
 R=G B G H +D in which equation: R represents a cross-correlation matrix, G represent a gain matrix comprising gain parameters, G H represents the Hermitian conjugate of the gain matrix, D represents a ((block) diagonal) noise matrix comprising noise parameters and B represents a matrix comprising information about the signal source.