Constrained total least squares applied to superresolution array processing

The constrained total least squares (CTLS) method, a regularization technique for solving an overdetermined system of linear equations whose coefficients have been perturbed by noise, is described. The CTLS technique can be used to estimate the direction of arrival of planar wavefronts impinging on a uniform array. Simulation results are presented that show that the accuracy and resolution of the CTLS method, when applied to real or simulated data, are equal or superior to those of other techniques