Broadband DOA Estimation by Exploiting DFT Extrapolation

This study proposes broadband direction (DOA) estimation through discrete Fourier transform (DFT) extrapolation. We used DFT extrapolation in the lower band and extended the sampled data to reduce the beam width in the spectral domain and improved the accuracy of the estimated DOA. The sampled data...

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Bibliographic Details
Published in:Applied sciences 2023-01, Vol.13 (1), p.660
Main Authors: Shin, Euiho, Chung, Young-seek, Kim, Seonkyo, Park, Cheolsun, Oh, Jungsuek
Format: Article
Language:English
Subjects:
Algorithms
Antennas
Arrays
Broadband
broadband beamformer
DFT extrapolation
DOA estimation
Extrapolation
Fourier transforms
Frequencies
Sampled data
Simulation
Time series
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Summary:This study proposes broadband direction (DOA) estimation through discrete Fourier transform (DFT) extrapolation. We used DFT extrapolation in the lower band and extended the sampled data to reduce the beam width in the spectral domain and improved the accuracy of the estimated DOA. The sampled data with a length of 12 were extrapolated to 36 by the addition of 12-element virtual arrays to 12 real arrays on both sides. The average RMSEs of the estimated DOAs were measured throughout the wide frequency band. To verify the validity of the proposed algorithm, we demonstrated that the RMSE obtained from the broadband DOA estimation for multiple signals of interest (SOIs) was reduced in the extrapolated array. It was demonstrated that the proposed algorithm can broaden the frequency band at which a fixed number of array can estimate the DOA accurately.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13010660