A DOA Estimation Algorithm from Sparse Representation Perspective for Vehicular Application

An enhanced smoothed l0-norm algorithm for the passive phased array system, which uses the covariance matrix of the received signal, is proposed in this paper. The SL0 (smoothed l0-norm) algorithm is a fast compressive-sensing-based DOA (direction-of-arrival) estimation algorithm that uses a single snapshot from the received signal. In the conventional SL0 algorithm, there are limitations in the resolution and the DOA estimation performance, since a single sample is used. If multiple snapshots are used, the conventional SL0 algorithm can improve performance in terms of the DOA estimation. In this paper, a covariance-fitting-based SL0 algorithm is proposed to further reduce the number of optimization variables when using multiple snapshots of the received signal. A cost function and a new null-space projection term of the sparse recovery for the proposed scheme are presented. In order to verify the performance of the proposed algorithm, we present the simulation results and the experimental results based on the measured data.

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Two-dimensional DOA estimation algorithm based on time-frequency point selection

Proceedings of the International Conference on Artificial Intelligence, Information Processing and Cloud Computing - AIIPCC '19 ◽

10.1145/3371425.3371445 ◽

2019 ◽

Author(s):

Yong Hou ◽

Yan Feng ◽

Jie Hao

Keyword(s):

Estimation Algorithm ◽

Doa Estimation ◽

Two Dimensional ◽

Point Selection ◽

Time Frequency

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Spectral Domain Sparse Representation for DOA Estimation of Signals with Large Dynamic Range

Sensors ◽

10.3390/s21155164 ◽

2021 ◽

Vol 21 (15) ◽

pp. 5164

Author(s):

Jacob Compaleo ◽

Inder J. Gupta

Keyword(s):

Sparse Representation ◽

Antenna Array ◽

Dynamic Range ◽

Direction Of Arrival ◽

Doa Estimation ◽

Single Step ◽

Window Function ◽

Spectral Domain ◽

Low Sidelobe ◽

Weighting Window

Recently, we proposed a Spectral Domain Sparse Representation (SDSR) approach for the direction-of-arrival estimation of signals incident to an antenna array. In the approach, sparse representation is applied to the conventional Bartlett spectra obtained from snapshots of the signals received by the antenna array to increase the direction-of-arrival (DOA) estimation resolution and accuracy. The conventional Bartlett spectra has limited dynamic range, meaning that one may not be able to identify the presence of weak signals in the presence of strong signals. This is because, in the conventional Bartlett spectra, uniform weighting (window) is applied to signals received by various antenna elements. Apodization can be used in the generation of Bartlett spectra to increase the dynamic range of the spectra. In Apodization, more than one window function is used to generate different portions of the spectra. In this paper, we extend the SDSR approach to include Bartlett spectra obtained with Apodization and to evaluate the performance of the extended SDSR approach. We compare its performance with a two-step SDSR approach and with an approach where Bartlett spectra is obtained using a low sidelobe window function. We show that an Apodization Bartlett-based SDSR approach leads to better performance with just single-step processing.

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