Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform Noise

To address the problems of low accuracy and low robustness of the conventional algorithm in estimating the direction of arrival (DOA) of coherent signals against a composite background of strong interference and non-uniform noise, in this paper, a coherent signal DOA estimation algorithm based on fi...

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Main Authors: Bin Lin, Guoping Hu, Hao Zhou, Guimei Zheng
Format: Article
Language:English
Published: MDPI AG 2022-12-01
Series:Sensors
Subjects:
Online Access:https://www.mdpi.com/1424-8220/22/24/9833
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author Bin Lin
Guoping Hu
Hao Zhou
Guimei Zheng
author_facet Bin Lin
Guoping Hu
Hao Zhou
Guimei Zheng
author_sort Bin Lin
collection DOAJ
description To address the problems of low accuracy and low robustness of the conventional algorithm in estimating the direction of arrival (DOA) of coherent signals against a composite background of strong interference and non-uniform noise, in this paper, a coherent signal DOA estimation algorithm based on fixed projection blocking is proposed in conjunction with a multi-input multi-output (MIMO) radar. The covariance matrix of the received signal is first decomposed by eigenvalues, and a fixed projection matrix orthogonal to the interference guidance vector is constructed as the interference blocking matrix. Then, the received array signal is pre-processed to re-form the covariance matrix, and this matrix is rendered decoherent through a Toeplitz reconstruction. Finally, the reconstructed covariance matrix is estimated by DOA using the propagation operator algorithm to reduce the complexity. The simulation verifies that the proposed algorithm has a better robustness and higher accuracy than conventional algorithms for the DOA estimation of coherent signals in composite backgrounds.
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spelling doaj.art-19a3f1873f3f46a5b72cd75f87595f782023-11-24T17:56:02ZengMDPI AGSensors1424-82202022-12-012224983310.3390/s22249833Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform NoiseBin Lin0Guoping Hu1Hao Zhou2Guimei Zheng3Air and Missile Defense College, Air Force Engineering University, Xi’an 710051, ChinaAir and Missile Defense College, Air Force Engineering University, Xi’an 710051, ChinaAir and Missile Defense College, Air Force Engineering University, Xi’an 710051, ChinaAir and Missile Defense College, Air Force Engineering University, Xi’an 710051, ChinaTo address the problems of low accuracy and low robustness of the conventional algorithm in estimating the direction of arrival (DOA) of coherent signals against a composite background of strong interference and non-uniform noise, in this paper, a coherent signal DOA estimation algorithm based on fixed projection blocking is proposed in conjunction with a multi-input multi-output (MIMO) radar. The covariance matrix of the received signal is first decomposed by eigenvalues, and a fixed projection matrix orthogonal to the interference guidance vector is constructed as the interference blocking matrix. Then, the received array signal is pre-processed to re-form the covariance matrix, and this matrix is rendered decoherent through a Toeplitz reconstruction. Finally, the reconstructed covariance matrix is estimated by DOA using the propagation operator algorithm to reduce the complexity. The simulation verifies that the proposed algorithm has a better robustness and higher accuracy than conventional algorithms for the DOA estimation of coherent signals in composite backgrounds.https://www.mdpi.com/1424-8220/22/24/9833non-uniform noisestrong interference signalscoherent signalsarray signal processingdirection of arrival estimation
spellingShingle Bin Lin
Guoping Hu
Hao Zhou
Guimei Zheng
Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform Noise
Sensors
non-uniform noise
strong interference signals
coherent signals
array signal processing
direction of arrival estimation
title Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform Noise
title_full Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform Noise
title_fullStr Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform Noise
title_full_unstemmed Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform Noise
title_short Coherent Signal DOA Estimation for MIMO Radar under Composite Background of Strong Interference and Non-Uniform Noise
title_sort coherent signal doa estimation for mimo radar under composite background of strong interference and non uniform noise
topic non-uniform noise
strong interference signals
coherent signals
array signal processing
direction of arrival estimation
url https://www.mdpi.com/1424-8220/22/24/9833
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AT guopinghu coherentsignaldoaestimationformimoradarundercompositebackgroundofstronginterferenceandnonuniformnoise
AT haozhou coherentsignaldoaestimationformimoradarundercompositebackgroundofstronginterferenceandnonuniformnoise
AT guimeizheng coherentsignaldoaestimationformimoradarundercompositebackgroundofstronginterferenceandnonuniformnoise