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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MDPI AG
2022-12-01
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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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institution | Directory Open Access Journal |
issn | 1424-8220 |
language | English |
last_indexed | 2024-03-09T15:52:15Z |
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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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