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Paper Abstract and Keywords
Presentation 2026-01-27 14:00
Evaluation of the Effect of Directivity Deviations on DOA Estimation on MIMO Radar
Ryo Ijichi, Ryuichiro Kataoka, Steven Wandale, Koichi Ichige (Yokohama National Univ.), Shota Kunikata, Ryo Saito, Katsuhisa Kashiwagi, Takahiro Kinoshita (Murata Manufacturing) IT2025-75 SIP2025-89 RCS2025-246
Abstract (in Japanese) (See Japanese page) 
(in English) Direction-of-Arrival (DOA) estimation using array antennas has been widely applied in various fields such as autonomous driving and surveillance systems. However, in practical environments, element-specific variations in gain and phase characteristics, sensor position errors, and mutual coupling among elements cause deviations in element directivity, which can degrade DOA estimation accuracy. Although these directivity deviations are considered potential error sources, their effects on DOA estimation performance have not been fully investigated.
In this study, gain and phase variations among array elements are modeled, and their effects on DOA estimation errors and spatial spectrum characteristics are analyzed through simulations. Furthermore, the relationship between the magnitude of these variations and estimation accuracy is clarified, providing insights for the design of high-precision array antennas and calibration techniques. Experimental antenna data are also used to validate the analytical results and confirm the consistency with the theoretical model.
Keyword (in Japanese) (See Japanese page) 
(in English) MIMO radar / DOA estimation / Directivity deviation / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 333, SIP2025-89, pp. 220-225, Jan. 2026.
Paper # SIP2025-89 
Date of Issue 2026-01-19 (IT, SIP, RCS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IT2025-75 SIP2025-89 RCS2025-246

Conference Information
Committee IT RCS SIP  
Conference Date 2026-01-26 - 2026-01-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Forest Sendai 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing for Wireless Communications, Learning, Mathematics, Information Theory, etc. 
Paper Information
Registration To SIP 
Conference Code 2026-01-IT-RCS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Evaluation of the Effect of Directivity Deviations on DOA Estimation on MIMO Radar 
Sub Title (in English)  
Keyword(1) MIMO radar  
Keyword(2) DOA estimation  
Keyword(3) Directivity deviation  
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Keyword(5)  
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1st Author's Name Ryo Ijichi  
1st Author's Affiliation Yokohama National University (Yokohama National Univ.)
2nd Author's Name Ryuichiro Kataoka  
2nd Author's Affiliation Yokohama National University (Yokohama National Univ.)
3rd Author's Name Steven Wandale  
3rd Author's Affiliation Yokohama National University (Yokohama National Univ.)
4th Author's Name Koichi Ichige  
4th Author's Affiliation Yokohama National University (Yokohama National Univ.)
5th Author's Name Shota Kunikata  
5th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
6th Author's Name Ryo Saito  
6th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
7th Author's Name Katsuhisa Kashiwagi  
7th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
8th Author's Name Takahiro Kinoshita  
8th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
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Speaker Author-1 
Date Time 2026-01-27 14:00:00 
Presentation Time 25 minutes 
Registration for SIP 
Paper # IT2025-75, SIP2025-89, RCS2025-246 
Volume (vol) vol.125 
Number (no) no.332(IT), no.333(SIP), no.334(RCS) 
Page pp.220-225 
#Pages 6 
Date of Issue 2026-01-19 (IT, SIP, RCS) 

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