Covariance eigenstructure approach to 2-D harmonic retrievel

A new approach is presented to the problem of estimating the directions-of-arrival and the frequencies of multiple narrowband sources--the so-called 2-D harmonic retrieval problem. The approach presented applies to the general case of correlated sources and includes multipath propagation as a special case. The estimators presented yield high resolution and asymptotically unbiased estimates of the directions-of-arrival and frequencies of the impinging sources and enable trade-offs between resolution and accuracy.