Ryo Natsuaki

93 papers B 5C 48Journal 32Unranked 8
YearRankTypeTitle / Venue / Authors
2026 J jnl
A Sequential Doppler Offset (SDO) Method for Locating Targets Causing Azimuth Fractional Ambiguity in Spaceborne HRWS-SAR.
IEEE Geosci. Remote. Sens. Lett.
Yanyan Zhang, Akira Hirose, Ryo Natsuaki
2026 J jnl
SAR Waveform Diversity Using PN-Sequence and Its Optimization With Genetic Algorithm.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Raito Suzuki, Akira Hirose, Ryo Natsuaki
2026 J jnl
Virtual Delay-Emission (VDE): An HRWS Imaging Mode for Spaceborne MIMO-SAR.
IEEE Geosci. Remote. Sens. Lett.
Yanyan Zhang, Akira Hirose, Ryo Natsuaki
2025 J jnl
An Investigation of Systematic Bias in ALOS-2 Multilooked Interferograms.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Ryu Sugimoto, Yu Morishita, Masanobu Shimada, Ryo Natsuaki, Chiaki Tsutsumi, Ryosuke Nakamura, Toru Kouyama
2025 J jnl
Degree-of-Polarization-Based Radio Frequency Interference Detection for Synthetic Aperture Radar.
IEEE Trans. Geosci. Remote. Sens.
Yu Hashimoto, Akira Hirose, Ryo Natsuaki
2025 J jnl
Quaternion reservoir computing for spatiotemporal analysis in polarimetric synthetic aperture radar.
Neurocomputing
Kitoshi Kawai, Bungo Konishi, Ryo Natsuaki, Akira Hirose
2024 J jnl
Biquaternion Fourier Domain Filter for InSAR Noise Suppression by Enhancing Polarimetric-Interferometric Fringe Patterns.
IEEE Trans. Geosci. Remote. Sens.
Yuta Otsuka, Ryo Natsuaki, Akira Hirose
2024 C conf
Characterization of Systematic Bias in ALOS-2 Multilooked Interferograms.
IGARSS
Ryu Sugimoto, Yu Morishita, Masanobu Shimada, Ryo Natsuaki, Chiaki Tsutsumi, Ryosuke Nakamura, Toru Kouyama
2024 C conf
Comparison of Temporal Decorrelation Decay Functions Over Land Cover Types for L- and C-vand SAR.
IGARSS
Yukio Endo, Yu Morishita, Ryu Sugimoto, Ryo Natsuaki, Masanobu Shimada, Chiaki Tsutsumi, Toru Kouyama, Ryosuke Nakamura
2024 C conf
Complex-Valued Neural-Network Inverse Mapping for Explainability in PolSAR/InSAR Applications.
IGARSS
Gunjan Joshi, Ryo Natsuaki, Akira Hirose
2024 C conf
Landmine Detection Based on Riemannian Phasor Quaternion Self-Organizing Map.
IGARSS
Yicheng Song, Ryo Natsuaki, Akira Hirose
2024 J jnl
Multisensor Glacier Surface Classification Using Confidence-Aware Explainable Inverse-Mapping Neural Network.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Gunjan Joshi, Celia A. Baumhoer, Andreas J. Dietz, Ryo Natsuaki, Akira Hirose
2024 C conf
Optimizing PN-Sequences with Genetic Algorithm for SAR Waveform Diversity.
IGARSS
Raito Suzuki, Akira Hirose, Ryo Natsuaki
2024 C conf
P4006: An IEEE Standard in Development for RFI Impact Assessment.
IGARSS
Raúl Díez-García, Roger Oliva, Ryo Natsuaki, Priscilla N. Mohammed, Beau Backus, Mingliang Tao, Paolo de Matthaeis
2024 C conf
Polarimetric Goldstein Filter for Interferometric Phase Denoising.
IGARSS
Yuta Otsuka, Ryo Natsuaki, Akira Hirose
2024 J jnl
Quaternion Neural Networks: A physics-incorporated intelligence framework [Hypercomplex Signal and Image Processing].
IEEE Signal Process. Mag.
Akira Hirose, Fang Shang, Yuta Otsuka, Ryo Natsuaki, Yuya Matsumoto, Naoto Usami, Yicheng Song, Haotian Chen
2024 C conf
RFI Detection Using Degree of Polarization for Polarimetric Synthetic Aperture Radar.
IGARSS
Yu Hashimoto, Ryo Natsuaki, Akira Hirose
2024 J jnl
Removal of Synthetic Aperture Radar Range Ambiguity by Observing Adjacent Regions.
IEEE Geosci. Remote. Sens. Lett.
Raiki Kudo, Akira Hirose, Ryo Natsuaki
2024 J jnl
Robust Symbol Detection Based on Quaternion Neural Networks in Wireless Polarization-Shift-Keying Communications.
IEEE Trans. Neural Networks Learn. Syst.
Haotian Chen, Ryo Natsuaki, Akira Hirose
2024 J jnl
Time Series Scattering Power Decomposition Using Ensemble Average in Temporal-Spatial Domains: Application to Forest Disturbance Detection.
IEEE Geosci. Remote. Sens. Lett.
Ryu Sugimoto, Ryo Natsuaki, Ryosuke Nakamura, Chiaki Tsutsumi, Yoshio Yamaguchi
2024 B conf
Time-series Forecasting Coding: A New Processing Method Developed from Predictive Coding for Recurrent Neural Networks.
IJCNN
Yuto Wakui, Junya Kato, Ryo Natsuaki, Akira Hirose
2024 — conf
Utilizing Small and Large Spectral Radii for Appropriate Reservoir Computing Design.
ICONIP (1)
Bungo Konishi, Akira Hirose, Ryo Natsuaki
2024 — conf
Wrist measurement for millimeter-wave non-invasive glucose monitoring: Numerical analysis of an anatomically realistic tissue model.
EMBC
Lena Azuma, Ryo Natsuaki, Akira Hirose
2023 J jnl
Application of Inverse Mapping for Automated Determination of Normalized Indices Useful for Land Surface Classification.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Gunjan Joshi, Ryo Natsuaki, Akira Hirose
2023 C conf
Automated Determination of Normalized Indices Useful for Glacier Surface Classification.
IGARSS
Gunjan Joshi, Ryo Natsuaki, Akira Hirose
2023 C conf
Estimation of Dielectric Constant Distribution Utilizing Subsurface Objects Based on Radar Image Focusing.
IGARSS
Ryuta Imai, Ryo Natsuaki, Akira Hirose
2023 C conf
Extending Observation Coverage of SAR by Separating Range Ambiguous Signals Using PN-sequences.
IGARSS
Raito Suzuki, Ryo Natsuaki, Akira Hirose
2023 C conf
INSAR Phase Filtering By Attention-Based Reservoir Computing For High Reliability.
IGARSS
Bungo Konishi, Akira Hirose, Ryo Natsuaki
2023 C conf
Landmine Detection Based on Generalized Riemannian Quaternion Self-Organizing Map.
IGARSS
Yicheng Song, Ryo Natsuaki, Akira Hirose
2023 J jnl
Neural Network Fusion Processing and Inverse Mapping to Combine Multisensor Satellite Data and Analyze the Prominent Features.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Gunjan Joshi, Ryo Natsuaki, Akira Hirose
2023 C conf
Proposal of Biquaternion Neural Networks for Coherent Processing of Polarization-and-Phase Information in Polsar and Polinsar.
IGARSS
Yuta Otsuka, Ryo Natsuaki, Akira Hirose
2023 B conf
Reservoir Computing for Symbol Detection of Optical Wireless Scattering Communications.
IJCNN
Haotian Chen, Ryo Natsuaki, Akira Hirose
2023 J jnl
Riemannian Quaternion Self-Organizing Map to Overcome Degree-of-Polarization Error in Polarimetric Ground-Penetrating Radar.
IEEE Trans. Geosci. Remote. Sens.
Yicheng Song, Ryo Natsuaki, Akira Hirose
2023 — conf
Skin-Penetrating Interfaces for Millimeter-Wave Non-Invasive Glucose Concentration Estimation: Numerical Analysis.
EMBC
Lena Azuma, Ryo Natsuaki, Akira Hirose
2023 C conf
Standardizing The Impact Assessment of Radio Frequency Interference (RFI) in Space-Based Remote Sensing: Challenges and Benefits.
IGARSS
Ryo Natsuaki, Roger Oliva, Raúl Díez-García, Mingliang Tao, Paolo de Matthaeis
2023 B conf
Symbol Detection for Polarization Shift Keying Based on Quaternion Neural Networks.
IJCNN
Haotian Chen, Ryo Natsuaki, Akira Hirose
2023 C conf
Target-Phase-Focused Feature Synthesis and Extraction for Weakly Scattering Objects in Ground Penetrating Radar.
IGARSS
Ryuta Imai, Ryo Natsuaki, Akira Hirose
2023 C conf
Urban Damage Detection Using Temporally Stacked Synthetic Aperture Radar Interferometric Coherence.
IGARSS
Ryo Natsuaki, Ryu Sugimoto, Masanobu Shimada, Chiaki Tsutsumi, Ryosuke Nakamura
2022 C conf
An experiment of flooded building detection using ALOS-2 and a flood experiment field.
IGARSS
Masato Ohki, Ryo Natsuaki, Sadayoshi Aoyama, Takeo Tadono
2022 J jnl
Full-Learning Rotational Quaternion Convolutional Neural Networks and Confluence of Differently Represented Data for PolSAR Land Classification.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Yuya Matsumoto, Ryo Natsuaki, Akira Hirose
2022 C conf
InSAR Phase Unwrapping Using Dynamics of Coupled Phase Oscillators of the Kuramoto Model.
IGARSS
Bungo Konishi, Akira Hirose, Ryo Natsuaki
2022 J jnl
Model-Based Homogeneity to Extend Compressed Sensing for Ground Penetrating Radar.
IEEE Trans. Geosci. Remote. Sens.
Ryuta Imai, Yicheng Song, Ryo Natsuaki, Akira Hirose
2022 C conf
Neural Network Model for Multi-Sensor Fusion and Inverse Mapping Dynamics for the Analysis of Significant Factors.
IGARSS
Gunjan Joshi, Ryo Natsuaki, Akira Hirose
2022 C conf
Polarimetric Analysis of RFI in L-Band SAR System.
IGARSS
Ryo Natsuaki, Akira Hirose
2022 J jnl
Polarization-Aware Prediction of Mobile Radio Wave Propagation Based on Complex-Valued and Quaternion Neural Networks.
IEEE Access
Haotian Chen, Ryo Natsuaki, Akira Hirose
2022 B conf
Predicting polarization state based on quaternion neural networks to facilitate channel prediction.
IJCNN
Haotian Chen, Ryo Natsuaki, Akira Hirose
2022 C conf
Proposal of Detection of Subsurface Objects with Model-Based Homogeneity to Extend Compressed Sensing.
IGARSS
Ryuta Imai, Yicheng Song, Ryo Natsuaki, Akira Hirose
2022 C conf
Proposal of PolSAR Land Classification Using Full-Learning Quaternion Convolutional Neural Networks.
IGARSS
Yuya Matsumoto, Ryo Natsuaki, Akira Hirose
2021 J jnl
Complex-Valued Reservoir Computing for Interferometric SAR Applications With Low Computational Cost and High Resolution.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Bungo Konishi, Akira Hirose, Ryo Natsuaki
2021 C conf
Emulation of a Sar Interferogram from the Past Satellites for the Present Events.
IGARSS
Ryo Natsuaki, Ryu Sugimoto, Chiaki Tsutsumi, Ryosuke Nakamura
2021 — conf
Generalization characteristics of complex-valued reservoir computing for interferometric synthetic aperture radar applications.
APSIPA ASC
Bungo Konishi, Akira Hirose, Ryo Natsuaki
2021 C conf
Proposal of Complex-Valued Reservoir Computing for Topographic Aspect Classification.
IGARSS
Bungo Konishi, Akira Hirose, Ryo Natsuaki
2021 C conf
Proposal of PolSAR Land Classification Using Quaternion Convolutional Neural Networks.
IGARSS
Yuya Matsumoto, Ryo Natsuaki, Akira Hirose
2021 — conf
Proposal of higher-order tensor independent component analysis for signal separation in multiple-input multiple-output respiration/heartbeat remote sensing
EMBC
Seishiro Goto, Ryo Natsuaki, Akira Hirose
2020 C conf
Complex-Valued Convolutional Neural Networks in Interferometric Synthetic Aperture Radar and Their Teacher-Image Pollution Influence on the Performance.
IGARSS
Yuki Sunaga, Ryo Natsuaki, Akira Hirose
2020 J jnl
Consideration on Singular-Point Generating Mechanisms by Analyzing the Effect of Phase-and-Polarization Optimization in PolInSAR.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Yuta Otsuka, Tomoharu Shimada, Ryo Natsuaki, Akira Hirose
2020 B conf
Similar land-form discovery: Complex absolute-value max pooling in complex-valued convolutional neural networks in interferometric synthetic aperture radar.
IJCNN
Yuki Sunaga, Ryo Natsuaki, Akira Hirose
2020 C conf
Similarity Approach for Radio Frequency Interference Detection and Correction in Multi-Receiver SAR.
IGARSS
Ryo Natsuaki, Marc Jäger, Pau Prats-Iraola
2020 C conf
Suppression of Additional Azimuth Ambiguities Under Multi-Channel and Multi-Waveform SAR.
IGARSS
Ryo Natsuaki, Pau Prats-Iraola
2020 J jnl
Synthetic Aperture Radar Flood Detection under Multiple Modes and Multiple Orbit Conditions: A Case Study in Japan on Typhoon Hagibis, 2019.
Remote. Sens.
Ryo Natsuaki, Hiroto Nagai
2019 C conf
Demonstration of InSAR-Based Three Dimensional Continuous Deformation Monitoring.
IGARSS
Ryo Natsuaki, Akiko Noda
2019 C conf
Dependence of Polarimetric Characteristics on Sar Resolutions: Experimental Analysis.
IGARSS
Hyunsoo Kim, Jungmin Song, Ryo Natsuaki, Akira Hirose
2019 C conf
Enhancement of Polarization Mechanism in Pixel-By-Pixel Phase Optimization in Polinsar.
IGARSS
Yuta Otsuka, Ryo Natsuaki, Akira Hirose
2019 C conf
Investigations on the Optimum Combination of Azimuth Phase Coding and Up- and Down-Chirp Modulation for Range Ambiguity Suppression.
IGARSS
Ryo Natsuaki, Nida Sakar, Nestor Yague-Martinez, Muriel Pinheiro, Pau Prats-Iraola
2019 J jnl
Land Form Classification and Similar Land-Shape Discovery by Using Complex-Valued Convolutional Neural Networks.
IEEE Trans. Geosci. Remote. Sens.
Yuki Sunaga, Ryo Natsuaki, Akira Hirose
2019 J jnl
Urban Flood Mapping Using SAR Intensity and Interferometric Coherence via Bayesian Network Fusion.
Remote. Sens.
Yu Li, Sandro Martinis, Marc Wieland, Stefan Schlaffer, Ryo Natsuaki
2018 C conf
Effect of Building Orientation on Urban Flood Mapping Using Alos-2 Ampilitude Images.
IGARSS
Youngjoo Kwak, Ryo Natsuaki, Sang-Ho Yun
2018 J jnl
Experimental Analysis on the Mechanisms of Singular Point Generation in InSAR by Employing Scaled Optical Interferometry.
IEEE Trans. Geosci. Remote. Sens.
Shunichiro Fujinami, Ryo Natsuaki, Kazuhide Ichikawa, Akira Hirose
2018 C conf
L-Band SAR Interferometric Analysis for Flood Detection in Urban Area - a Case Study in 2015 Joso Flood, Japan.
IGARSS
Ryo Natsuaki, Akira Hirose
2018 J jnl
Pixel-by-Pixel Scattering Mechanism Vector Optimization in High-Resolution PolInSAR.
IEEE Trans. Geosci. Remote. Sens.
Tomoharu Shimada, Ryo Natsuaki, Akira Hirose
2018 C conf
Profiles of RFI in Alos-2 Images - A Case Study in Tokyo Bay, Japan.
IGARSS
Ryo Natsuaki, Akira Hirose
2018 — conf
Proposal of Complex-Valued Convolutional Neural Networks for Similar Land-Shape Discovery in Interferometric Synthetic Aperture Radar.
ICONIP (1)
Yuki Sunaga, Ryo Natsuaki, Akira Hirose
2018 J jnl
Sensitivity and Limitation in Damage Detection for Individual Buildings Using InSAR Coherence - A Case Study in 2016 Kumamoto Earthquakes.
Remote. Sens.
Ryo Natsuaki, Hiroto Nagai, Naoya Tomii, Takeo Tadono
2017 J jnl
An Autocorrelation-Based Radio Frequency Interference Detection and Removal Method in Azimuth-Frequency Domain for SAR Image.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Ryo Natsuaki, Takeshi Motohka, Manabu Watanabe, Masanobu Shimada, Shinichi Suzuki
2017 J jnl
Burst Misalignment Evaluation for ALOS-2 PALSAR-2 ScanSAR-ScanSAR Interferometry.
Remote. Sens.
Ryo Natsuaki, Takeshi Motohka, Masanobu Shimada, Shinichi Suzuki
2017 C conf
Performance of ALOS-2 PALSAR-2 for disaster response.
IGARSS
Ryo Natsuaki, Masato Ohki, Hiroto Nagai, Takeshi Motohka, Takeo Tadono, Masanobu Shimada, Shinichi Suzuki
2017 C conf
Polarimetric characteristics of temporarily coherent RFI in alos-2 palsar-2.
IGARSS
Ryo Natsuaki, Takeshi Motohka, Takeo Tadono, Shinichi Suzuki
2016 C conf
ALOS-2 operation status.
IGARSS
Yukihiro Kankaku, Shinichi Suzuki, Takeshi Motohka, Masato Ohki, Ryo Natsuaki, Masanobu Shimada
2016 C conf
Emergency observation and disaster monitoring performed by ALOS-2 PALSAR-2.
IGARSS
Ryo Natsuaki, Takeshi Motohka, Manabu Watanabe, Masato Ohki, Rajesh Bahadur Thapa, Hiroto Nagai, Takeo Tadono, Masanobu Shimada, Shinichi Suzuki
2016 C conf
RFI detection and removal in Range-time Azimuth-frequency domain.
IGARSS
Ryo Natsuaki, Manabu Watanabe, Takeshi Motohka, Shinichi Suzuki
2016 C conf
Trial of volcanic ash detection using L-band synthetic aperture radar (SAR).
IGARSS
Manabu Watanabe, Masashi Sonobe, Ryo Natsuaki, Shinichi Suzuki
2015 C conf
Accuracy improvement by residue and amplitude based local co-registration method for ALOS-2/PALSAR-2 DInSAR.
IGARSS
Ryo Natsuaki, Manabu Watanabe, Takeshi Motooka, Masato Ohki, Masanobu Shimada
2015 C conf
Experimental analysis of singular point generation mechanisms in interferometric SAR using optics: The possibility of singular point generation by interference in a single pixel.
IGARSS
Shunichiro Fujinami, Ryo Natsuaki, Akira Hirose
2014 C conf
Changes of dominant scatterers and propagation paths as a possible origin of singular points in radar interferometry: Experimental analysis.
IGARSS
Ryo Natsuaki, Akira Hirose
2014 J jnl
Circular property of complex-valued correlation learning in CMRF-based filtering for synthetic aperture radar interferometry.
Neurocomputing
Ryo Natsuaki, Akira Hirose
2014 J jnl
Ultrawideband Direction-of-Arrival Estimation Using Complex-Valued Spatiotemporal Neural Networks.
IEEE Trans. Neural Networks Learn. Syst.
Kotaro Terabayashi, Ryo Natsuaki, Akira Hirose
2013 J jnl
InSAR Local Co-Registration Method Assisted by Shape-From-Shading.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Ryo Natsuaki, Akira Hirose
2013 C conf
PHase property in complex-correlation and real-imaginary-correlation filtered SAR interferograms and its influence on DEM quality.
IGARSS
Ryo Natsuaki, Akira Hirose
2012 C conf
Improvement of ALOS interferogram quality by use of the local co-registration method using singular-point and amplitude information.
IGARSS
Ryo Natsuaki, Akira Hirose
2011 — conf
Circular Property in Complex-Valued Correlation Learning Observed in CMRF-Based Singular Unit Restoration for Phase Unwrapping.
IScIDE
Akira Hirose, Ryo Natsuaki
2011 C conf
Local co-registration for distortion reduction in SAR interferogram using amplitude information - combination of SPEC method and shape-from-shading -.
IGARSS
Ryo Natsuaki, Akira Hirose
2011 J jnl
SPEC Method - A Fine Coregistration Method for SAR Interferometry.
IEEE Trans. Geosci. Remote. Sens.
Ryo Natsuaki, Akira Hirose
2009 — conf
Local, Nonlinear Adaptive Co-registration of Master and Slave Interferometric SAR Complex Image Data for High Quality Digital Elevation Map Generation.
IGARSS (5)
Ryo Natsuaki, Akira Hirose