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Sigma-Delta Beamformer DOA Estimation for Distributed Array Radar
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Summary :
Distributed array radars consist of multiple sub-arrays separated by tens to hundreds of wavelengths and can match narrow beamwidths with large-aperture, high-gain antennas. The physical independence of the sub-arrays contributes to significant structure flexibility and is one of the advantages of such radars. However, a typical problem is the grating lobes in the digital beam forming (DBF) beam pattern. Unfortunately, the need to suppress the generation of grating lobes makes the design of acceptable sub-array arrangements very difficult. A sigma-delta beam former direction of arrival (DOA) estimation method is proposed in this study to solve this problem. The proposed method performs DOA estimation by acquiring the difference signals in addition to the sum signals of all sub-arrays. The difference signal is typically used for monopulse DOA estimation in the phased array radar. The sigma-delta beamformer simultaneously has both advantages of DOA estimations using a distributed array with a large aperture length and using a sub-array that is not affected by the grating lobe. The proposed method can improve the DOA estimation accuracy over the conventional method under grating lobe situations and help the distributed array radar achieve flexibility in the sub-array arrangement. Numerical simulations are presented to verify the effectiveness of the proposed DOA estimation method.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E105-B No.12 pp.1589-1599
- Publication Date
- 2022/12/01
- Publicized
- 2022/06/09
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.2021EBP3211
- Type of Manuscript
- PAPER
- Category
- Sensing
Authors
Toshihiro ITO
Mitsubishi Electric Corp.,Kanazawa University
Shoji MATSUDA
Mitsubishi Electric Corp.
Yoshiya KASAHARA
Kanazawa University
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Toshihiro ITO, Shoji MATSUDA, Yoshiya KASAHARA, "Sigma-Delta Beamformer DOA Estimation for Distributed Array Radar" in IEICE TRANSACTIONS on Communications,
vol. E105-B, no. 12, pp. 1589-1599, December 2022, doi: 10.1587/transcom.2021EBP3211.
Abstract: Distributed array radars consist of multiple sub-arrays separated by tens to hundreds of wavelengths and can match narrow beamwidths with large-aperture, high-gain antennas. The physical independence of the sub-arrays contributes to significant structure flexibility and is one of the advantages of such radars. However, a typical problem is the grating lobes in the digital beam forming (DBF) beam pattern. Unfortunately, the need to suppress the generation of grating lobes makes the design of acceptable sub-array arrangements very difficult. A sigma-delta beam former direction of arrival (DOA) estimation method is proposed in this study to solve this problem. The proposed method performs DOA estimation by acquiring the difference signals in addition to the sum signals of all sub-arrays. The difference signal is typically used for monopulse DOA estimation in the phased array radar. The sigma-delta beamformer simultaneously has both advantages of DOA estimations using a distributed array with a large aperture length and using a sub-array that is not affected by the grating lobe. The proposed method can improve the DOA estimation accuracy over the conventional method under grating lobe situations and help the distributed array radar achieve flexibility in the sub-array arrangement. Numerical simulations are presented to verify the effectiveness of the proposed DOA estimation method.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2021EBP3211/_p
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@ARTICLE{e105-b_12_1589,
author={Toshihiro ITO, Shoji MATSUDA, Yoshiya KASAHARA, },
journal={IEICE TRANSACTIONS on Communications},
title={Sigma-Delta Beamformer DOA Estimation for Distributed Array Radar},
year={2022},
volume={E105-B},
number={12},
pages={1589-1599},
abstract={Distributed array radars consist of multiple sub-arrays separated by tens to hundreds of wavelengths and can match narrow beamwidths with large-aperture, high-gain antennas. The physical independence of the sub-arrays contributes to significant structure flexibility and is one of the advantages of such radars. However, a typical problem is the grating lobes in the digital beam forming (DBF) beam pattern. Unfortunately, the need to suppress the generation of grating lobes makes the design of acceptable sub-array arrangements very difficult. A sigma-delta beam former direction of arrival (DOA) estimation method is proposed in this study to solve this problem. The proposed method performs DOA estimation by acquiring the difference signals in addition to the sum signals of all sub-arrays. The difference signal is typically used for monopulse DOA estimation in the phased array radar. The sigma-delta beamformer simultaneously has both advantages of DOA estimations using a distributed array with a large aperture length and using a sub-array that is not affected by the grating lobe. The proposed method can improve the DOA estimation accuracy over the conventional method under grating lobe situations and help the distributed array radar achieve flexibility in the sub-array arrangement. Numerical simulations are presented to verify the effectiveness of the proposed DOA estimation method.},
keywords={},
doi={10.1587/transcom.2021EBP3211},
ISSN={1745-1345},
month={December},}
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TY - JOUR
TI - Sigma-Delta Beamformer DOA Estimation for Distributed Array Radar
T2 - IEICE TRANSACTIONS on Communications
SP - 1589
EP - 1599
AU - Toshihiro ITO
AU - Shoji MATSUDA
AU - Yoshiya KASAHARA
PY - 2022
DO - 10.1587/transcom.2021EBP3211
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E105-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2022
AB - Distributed array radars consist of multiple sub-arrays separated by tens to hundreds of wavelengths and can match narrow beamwidths with large-aperture, high-gain antennas. The physical independence of the sub-arrays contributes to significant structure flexibility and is one of the advantages of such radars. However, a typical problem is the grating lobes in the digital beam forming (DBF) beam pattern. Unfortunately, the need to suppress the generation of grating lobes makes the design of acceptable sub-array arrangements very difficult. A sigma-delta beam former direction of arrival (DOA) estimation method is proposed in this study to solve this problem. The proposed method performs DOA estimation by acquiring the difference signals in addition to the sum signals of all sub-arrays. The difference signal is typically used for monopulse DOA estimation in the phased array radar. The sigma-delta beamformer simultaneously has both advantages of DOA estimations using a distributed array with a large aperture length and using a sub-array that is not affected by the grating lobe. The proposed method can improve the DOA estimation accuracy over the conventional method under grating lobe situations and help the distributed array radar achieve flexibility in the sub-array arrangement. Numerical simulations are presented to verify the effectiveness of the proposed DOA estimation method.
ER -
English
