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Paper Abstract and Keywords
Presentation 2026-07-22 16:00
[Short Paper] HAPS-Based ISAC for Simultaneous Localization of Multiple Disaster Survivors Using Reused 4G/5G Signals
Kanta Iwatsuki, Tran Gia Khanh (Science Tokyo) SR2026-41
Abstract (in Japanese) (See Japanese page) 
(in English) Japan has repeatedly suffered severe damage from earthquakes, including the 2011 Great East Japan Earthquake. Furthermore, with a 90% probability of the Nankai Trough earthquake—a disaster potentially exceeding the scale of the 2011 event—occurring within the next 40 years, establishing effective damage mitigation strategies is an urgent issue. During a disaster, rapid rescue operations are critical. However, rapidly locating isolated survivors in GNSS-denied environments, such as under rubble from collapsed buildings or indoors, is extremely difficult. Therefore, estimating the rough locations and burial depths of isolated individuals across a vast, communication-disrupted disaster area would enable appropriate allocation of limited resources, such as rescue teams. This would facilitate smoother, faster rescue operations and reduce human casualties. To this end, this study proposes an initial wide-area positioning method leveraging High Altitude Platform Stations (HAPS) and smartphones based on the Integrated Sensing and Communications (ISAC) approach. We evaluate the limits of positioning performance in severe multipath and debris-attenuated environments simulating an urban disaster through numerical analysis using the MUSIC algorithm, and report on the effectiveness and practical limits of narrowing down targets for subsequent localized search by UAVs.
Keyword (in Japanese) (See Japanese page) 
(in English) HAPS / Localization / Disaster / Smartphone / ISAC / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 120, SR2026-41, pp. 111-113, July 2026.
Paper # SR2026-41 
Date of Issue 2026-07-14 (SR) 
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 SR2026-41

Conference Information
Committee SR RCC  
Conference Date 2026-07-21 - 2026-07-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamaguchi 
Topics (in Japanese) (See Japanese page) 
Topics (in English) IoT, Wireless Distributed Networks, Sensor Networks, Control Communications, Network Control, General Topics 
Paper Information
Registration To SR 
Conference Code 2026-07-SR-RCC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) HAPS-Based ISAC for Simultaneous Localization of Multiple Disaster Survivors Using Reused 4G/5G Signals 
Sub Title (in English)  
Keyword(1) HAPS  
Keyword(2) Localization  
Keyword(3) Disaster  
Keyword(4) Smartphone  
Keyword(5) ISAC  
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Keyword(8)  
1st Author's Name Kanta Iwatsuki  
1st Author's Affiliation Institute of Science Tokyo (Science Tokyo)
2nd Author's Name Tran Gia Khanh  
2nd Author's Affiliation Institute of Science Tokyo (Science Tokyo)
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Speaker Author-1 
Date Time 2026-07-22 16:00:00 
Presentation Time 15 minutes 
Registration for SR 
Paper # SR2026-41 
Volume (vol) vol.126 
Number (no) no.120 
Page pp.111-113 
#Pages 3 
Date of Issue 2026-07-14 (SR) 

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