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The problem of detecting point-like sources whose frequency spectrum is unknown is addressed. Limitations of single-frequency approaches are identified by analytical as well as numerical arguments. To overcome these limits, different multifrequency approaches which combine frequency data incoherently are compared. In particular, a novel multifrequency MUSIC-like algorithm based on interferometric concepts is proposed. Results show that the algorithm outperforms other methods under comparison.
Solimene, R. et al. (2013) Detecting point-like sources of unknown frequency spectra, Progress In Electromagnetics Research B, Vol. 50, 347-364, doi:10.2528/PIERB13030414