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Paper Abstract and Keywords
Presentation 2026-10-15 09:55
Adaptive Regularization for Three-Dimensional Time-Series Differential Interferometric Analysis Using Multi-Orbit SAR observations
Rikuto Kuromiya, Akira Hirose, Ryo Natsuaki (UTokyo) SANE2026-51
Abstract (in Japanese) (See Japanese page) 
(in English) We propose a three-dimensional displacement estimation method using time-series differential interferometric SAR (DInSAR) data acquired from multiple line-of-sight (LOS) directions, assuming without external data or an a priori deformation model. The proposed method selects the Tikhonov regularization parameter independently for each pixel based on a generalized cross-validation (GCV) loss that accounts for the entire time series, thereby suppressing instability caused by the viewing geometry. It also estimates a bias-correction coefficient from the consistency between cumulative LOS observations and the regularized solution to compensate for the underestimation caused by regularization. Validation over Kansai International Airport using 118 ALOS-2 images from four viewing geometries showed that the proposed method suppresses unstable horizontal estimates and improves consistency with measured land subsidence compared with an existing bias-correction method. The RMSE was approximately 1.2 cm/year for sites on the same island as the reference point and 6.3 cm/year for sites on the other island.
Keyword (in Japanese) (See Japanese page) 
(in English) Three-dimensional displacement estimation / time-series InSAR / Tikhonov regularization / generalized cross-validation / bias correction / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 192, SANE2026-51, pp. 7-12, Oct. 2026.
Paper # SANE2026-51 
Date of Issue 2026-10-08 (SANE) 
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 SANE2026-51

Conference Information
Committee SANE  
Conference Date 2026-10-15 - 2026-10-16 
Place (in Japanese) (See Japanese page) 
Place (in English) JAXA Sagamihara Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Technologies, Space Science and Applications, and generals 
Paper Information
Registration To SANE 
Conference Code 2026-10-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Adaptive Regularization for Three-Dimensional Time-Series Differential Interferometric Analysis Using Multi-Orbit SAR observations 
Sub Title (in English)  
Keyword(1) Three-dimensional displacement estimation  
Keyword(2) time-series InSAR  
Keyword(3) Tikhonov regularization  
Keyword(4) generalized cross-validation  
Keyword(5) bias correction  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Rikuto Kuromiya  
1st Author's Affiliation The University of Tokyo (UTokyo)
2nd Author's Name Akira Hirose  
2nd Author's Affiliation The University of Tokyo (UTokyo)
3rd Author's Name Ryo Natsuaki  
3rd Author's Affiliation The University of Tokyo (UTokyo)
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Speaker Author-1 
Date Time 2026-10-15 09:55:00 
Presentation Time 20 minutes 
Registration for SANE 
Paper # SANE2026-51 
Volume (vol) vol.126 
Number (no) no.192 
Page pp.7-12 
#Pages 6 
Date of Issue 2026-10-08 (SANE) 

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