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Paper Abstract and Keywords
Presentation 2026-04-09 16:35
[Invited Lecture] Interference Path Loss Analysis of Aircraft Radio Altimeters under Rough Surface Scattering
Kohsuke Ushimaru, Takashi Hikage, Manabu Omiya (Hokkaido Univ.), Kazuyuki Morioka, Shunichi Futatsumori (ENRI) AP2026-8
Abstract (in Japanese) (See Japanese page) 
(in English) To evaluate interference with aircraft radio altimeters in the Sub-6 GHz band of the fifth-generation mobile communication system (5G), we analyze Interference Path Loss (IPL) characteristics. In this study, we perform electromagnetic field simulations using a large-scale parallel Finite Difference Time Domain (FDTD) method. Previous studies have primarily assumed a flat surface as the ground model when aircraft are parked; however, in actual airport environments, scattering caused by ground surface irregularities may affect interference characteristics. Therefore, this paper performs an analysis incorporating a random rough-surface ground model in addition to a detailed numerical model of the Beechcraft B300 light aircraft. We compare the IPL characteristics on flat and rough ground surfaces and examine the effect of diffuse reflection from the ground on the interference power received by the radar altimeter antenna mounted on the underside of the aircraft.
Keyword (in Japanese) (See Japanese page) 
(in English) Radio Altimeter / Interference Path Loss / Ground Reflection / Rough Surface Scattering / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 1, AP2026-8, pp. 38-42, April 2026.
Paper # AP2026-8 
Date of Issue 2026-04-02 (AP) 
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 AP2026-8

Conference Information
Committee AP  
Conference Date 2026-04-09 - 2026-04-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka University Nakanoshima Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation, Electoro-magnetic simulation 
Paper Information
Registration To AP 
Conference Code 2026-04-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Interference Path Loss Analysis of Aircraft Radio Altimeters under Rough Surface Scattering 
Sub Title (in English)  
Keyword(1) Radio Altimeter  
Keyword(2) Interference Path Loss  
Keyword(3) Ground Reflection  
Keyword(4) Rough Surface Scattering  
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1st Author's Name Kohsuke Ushimaru  
1st Author's Affiliation Hokkaido University (Hokkaido Univ.)
2nd Author's Name Takashi Hikage  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ.)
3rd Author's Name Manabu Omiya  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ.)
4th Author's Name Kazuyuki Morioka  
4th Author's Affiliation Electronic Navigation Research Institute (ENRI)
5th Author's Name Shunichi Futatsumori  
5th Author's Affiliation Electronic Navigation Research Institute (ENRI)
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Speaker Author-1 
Date Time 2026-04-09 16:35:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2026-8 
Volume (vol) vol.126 
Number (no) no.1 
Page pp.38-42 
#Pages 5 
Date of Issue 2026-04-02 (AP) 

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