New parameter estimation algorithm for near-field sources

This paper proposes a new subspace-based algorithm to jointly estimate the frequencies, directions of arrival (DOAs), and ranges of multiple near-field narrow-band sources. Firstly, the proposed method constructs four cumulant matrices by virtue of the fourth-order cumulants of some properly chosen sensor outputs; secondly, by using the above-mentioned four matrices, it forms three new ones, from whose eigenvalues the source parameters can be easily obtained. In comparison with some available cumulant-based methods, the proposed algorithm can make efficient use of the array aperture, and thus has a higher estimation accuracy. Simulation results also show that the proposed method is of such performance.