AUTHOR=Lu Mingyang , Sun Dajun , Gulliver T. Aaron , Lv Yunfei , Mei Jidan 

TITLE=Broadband high-resolution direction of arrival estimation using the generalized weighted Radon transform

JOURNAL=Frontiers in Marine Science

VOLUME=10

YEAR=2024

URL=https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2023.1329898

DOI=10.3389/fmars.2023.1329898

ISSN=2296-7745

ABSTRACT=<p>Traditional direction of arrival (DOA) estimation algorithms typically have poor spatial resolution and robustness. In this paper, we propose a broadband high-resolution DOA estimation method based on the generalized weighted Radon transform (GWRT). The array signal can be converted into the frequency-wavenumber (<italic>f-k</italic>) domain using the conditional wavenumber spectrum function (CWSF). Then, a linear integral mathematical model for high-resolution DOA estimation is derived by transforming the <italic>f-k</italic> domain into the azimuth-energy domain using the GWRT. Computer simulation and sea trials were conducted to validate the feasibility and performance of the proposed method. The results obtained indicate that the proposed method yields a lower sidelobe level and can more effectively suppress the output energy in the non-target direction when compared to the conventional beamforming (CBF), steered minimum variance (STMV), and deconvolution (DCV) methods. Further, the proposed method provides improved spatial resolution and robustness in a multi-target environment.</p>