A Robust Numerical Approach for Array Calibration

In this paper, we focus on the problem of sensor array calibration in the presence of noise eld uncertainties. The objective is to compute a reliable estimate of the array response vector given nite sample estimates of the signal plus noise and noise only array covariances. These co-variances are computed from data collected at the sensor array with a calibration signal turned on and oo. Numerical diiculties are encountered in applying the usual generalized eigenvalue technique when the noise eld is near singular or has changed signiicantly over the two covariance measurements. We present a robust numerical approach for determining the response vector in these situations. Results of computer simulations to verify the proposed technique are also presented.