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Paper Abstract and Keywords
Presentation 2025-10-24 14:05
Power-Weighted Histogram-Based Micro-Doppler Spectrogram Estimation Using a FMCW Array Radar System
Shoma Nagata, Takuya Sakamoto (Kyoto Univ.) EMCJ2025-62 MW2025-148 EST2025-75
Abstract (in Japanese) (See Japanese page) 
(in English) Spectrograms containing micro-Doppler components induced by limb motion play an important role in a wide range of applications, including human activity recognition, personal identification, and fall detection using deep learning. In general, spectrogram computation with radar relies on slow-time signals; however, aliasing becomes a challenge when measuring fast-moving human body parts. On the other hand, while the use of chirp signals with shorter sampling intervals increases the maximum measurable velocity, conventional Doppler-FFT suffers from limited velocity resolution under hardware constraints with a small number of transmitted chirps. To address this issue, we propose a spectrogram computation method that does not rely on Doppler-FFT by combining reflection signal separation with a power-weighted histogram. Furthermore, we quantitatively validate the effectiveness of the proposed method through radar measurement experiments on human gait.
Keyword (in Japanese) (See Japanese page) 
(in English) array radar / chirp radar / micro-Doppler / spectrogram / human gait / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 210, EST2025-75, pp. 130-135, Oct. 2025.
Paper # EST2025-75 
Date of Issue 2025-10-16 (EMCJ, MW, EST) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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 EMCJ2025-62 MW2025-148 EST2025-75

Conference Information
Committee EMCJ MW EST IEE-EMC  
Conference Date 2025-10-23 - 2025-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EST 
Conference Code 2025-10-EMCJ-MW-EST-EMC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Power-Weighted Histogram-Based Micro-Doppler Spectrogram Estimation Using a FMCW Array Radar System 
Sub Title (in English)  
Keyword(1) array radar  
Keyword(2) chirp radar  
Keyword(3) micro-Doppler  
Keyword(4) spectrogram  
Keyword(5) human gait  
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1st Author's Name Shoma Nagata  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Takuya Sakamoto  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2025-10-24 14:05:00 
Presentation Time 25 minutes 
Registration for EST 
Paper # EMCJ2025-62, MW2025-148, EST2025-75 
Volume (vol) vol.125 
Number (no) no.208(EMCJ), no.209(MW), no.210(EST) 
Page pp.130-135 
#Pages 6 
Date of Issue 2025-10-16 (EMCJ, MW, EST) 

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