Local, Nonlinear Adaptive Co-registration of Master and Slave Interferometric SAR Complex Image Data for High Quality Digital Elevation Map Generation. - Ryo Natsuaki; Akira Hirose 001 (IGARSS (5), 2009)

Local co-registration for distortion reduction in SAR interferogram using amplitude information - combination of SPEC method and shape-from-shading -. - Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2011)

Circular Property in Complex-Valued Correlation Learning Observed in CMRF-Based Singular Unit Restoration for Phase Unwrapping. - Akira Hirose 001; Ryo Natsuaki (IScIDE, 2011)

SPEC Method - A Fine Coregistration Method for SAR Interferometry. - Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Geosci. Remote. Sens., 2011)

Improvement of ALOS interferogram quality by use of the local co-registration method using singular-point and amplitude information. - Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2012)

PHase property in complex-correlation and real-imaginary-correlation filtered SAR interferograms and its influence on DEM quality. - Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2013)

InSAR Local Co-Registration Method Assisted by Shape-From-Shading. - Ryo Natsuaki; Akira Hirose 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2013)

Changes of dominant scatterers and propagation paths as a possible origin of singular points in radar interferometry: Experimental analysis. - Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2014)

Circular property of complex-valued correlation learning in CMRF-based filtering for synthetic aperture radar interferometry. - Ryo Natsuaki; Akira Hirose 001 (Neurocomputing, 2014)

Ultrawideband Direction-of-Arrival Estimation Using Complex-Valued Spatiotemporal Neural Networks. - Kotaro Terabayashi; Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Neural Networks Learn. Syst., 2014)

Experimental analysis of singular point generation mechanisms in interferometric SAR using optics: The possibility of singular point generation by interference in a single pixel. - Shunichiro Fujinami; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2015)

Accuracy improvement by residue and amplitude based local co-registration method for ALOS-2/PALSAR-2 DInSAR. - Ryo Natsuaki; Manabu Watanabe; Takeshi Motooka; Masato Ohki; Masanobu Shimada (IGARSS, 2015)

ALOS-2 operation status. - Yukihiro Kankaku; Shinichi Suzuki; Takeshi Motohka; Masato Ohki; Ryo Natsuaki; Masanobu Shimada (IGARSS, 2016)

Emergency observation and disaster monitoring performed by ALOS-2 PALSAR-2. - Ryo Natsuaki; Takeshi Motohka; Manabu Watanabe; Masato Ohki; Rajesh Bahadur Thapa; Hiroto Nagai; Takeo Tadono; Masanobu Shimada; Shinichi Suzuki (IGARSS, 2016)

RFI detection and removal in Range-time Azimuth-frequency domain. - Ryo Natsuaki; Manabu Watanabe; Takeshi Motohka; Shinichi Suzuki (IGARSS, 2016)

Trial of volcanic ash detection using L-band synthetic aperture radar (SAR). - Manabu Watanabe; Masashi Sonobe; Ryo Natsuaki; Shinichi Suzuki (IGARSS, 2016)

Polarimetric characteristics of temporarily coherent RFI in alos-2 palsar-2. - Ryo Natsuaki; Takeshi Motohka; Takeo Tadono; Shinichi Suzuki (IGARSS, 2017)

Performance of ALOS-2 PALSAR-2 for disaster response. - Ryo Natsuaki; Masato Ohki; Hiroto Nagai; Takeshi Motohka; Takeo Tadono; Masanobu Shimada; Shinichi Suzuki (IGARSS, 2017)

Burst Misalignment Evaluation for ALOS-2 PALSAR-2 ScanSAR-ScanSAR Interferometry. - Ryo Natsuaki; Takeshi Motohka; Masanobu Shimada; Shinichi Suzuki (Remote. Sens., 2017)

An Autocorrelation-Based Radio Frequency Interference Detection and Removal Method in Azimuth-Frequency Domain for SAR Image. - Ryo Natsuaki; Takeshi Motohka; Manabu Watanabe; Masanobu Shimada; Shinichi Suzuki (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2017)

Proposal of Complex-Valued Convolutional Neural Networks for Similar Land-Shape Discovery in Interferometric Synthetic Aperture Radar. - Yuki Sunaga; Ryo Natsuaki; Akira Hirose 001 (ICONIP (1), 2018)

Effect of Building Orientation on Urban Flood Mapping Using Alos-2 Ampilitude Images. - Youngjoo Kwak; Ryo Natsuaki; Sang-Ho Yun (IGARSS, 2018)

Profiles of RFI in Alos-2 Images - A Case Study in Tokyo Bay, Japan. - Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2018)

L-Band SAR Interferometric Analysis for Flood Detection in Urban Area - a Case Study in 2015 Joso Flood, Japan. - Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2018)

Sensitivity and Limitation in Damage Detection for Individual Buildings Using InSAR Coherence - A Case Study in 2016 Kumamoto Earthquakes. - Ryo Natsuaki; Hiroto Nagai; Naoya Tomii; Takeo Tadono (Remote. Sens., 2018)

Experimental Analysis on the Mechanisms of Singular Point Generation in InSAR by Employing Scaled Optical Interferometry. - Shunichiro Fujinami; Ryo Natsuaki; Kazuhide Ichikawa; Akira Hirose 001 (IEEE Trans. Geosci. Remote. Sens., 2018)

Pixel-by-Pixel Scattering Mechanism Vector Optimization in High-Resolution PolInSAR. - Tomoharu Shimada; Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Geosci. Remote. Sens., 2018)

Dependence of Polarimetric Characteristics on Sar Resolutions: Experimental Analysis. - Hyunsoo Kim; Jungmin Song; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2019)

Demonstration of InSAR-Based Three Dimensional Continuous Deformation Monitoring. - Ryo Natsuaki; Akiko Noda (IGARSS, 2019)

Investigations on the Optimum Combination of Azimuth Phase Coding and Up- and Down-Chirp Modulation for Range Ambiguity Suppression. - Ryo Natsuaki; Nida Sakar; Nestor Yague-Martinez; Muriel Pinheiro; Pau Prats-Iraola (IGARSS, 2019)

Enhancement of Polarization Mechanism in Pixel-By-Pixel Phase Optimization in Polinsar. - Yuta Otsuka; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2019)

Urban Flood Mapping Using SAR Intensity and Interferometric Coherence via Bayesian Network Fusion. - Yu Li 020; Sandro Martinis; Marc Wieland; Stefan Schlaffer; Ryo Natsuaki (Remote. Sens., 2019)

Land Form Classification and Similar Land-Shape Discovery by Using Complex-Valued Convolutional Neural Networks. - Yuki Sunaga; Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Geosci. Remote. Sens., 2019)

Similarity Approach for Radio Frequency Interference Detection and Correction in Multi-Receiver SAR. - Ryo Natsuaki; Marc Jäger 001; Pau Prats-Iraola (IGARSS, 2020)

Suppression of Additional Azimuth Ambiguities Under Multi-Channel and Multi-Waveform SAR. - Ryo Natsuaki; Pau Prats-Iraola (IGARSS, 2020)

Complex-Valued Convolutional Neural Networks in Interferometric Synthetic Aperture Radar and Their Teacher-Image Pollution Influence on the Performance. - Yuki Sunaga; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2020)

Similar land-form discovery: Complex absolute-value max pooling in complex-valued convolutional neural networks in interferometric synthetic aperture radar. - Yuki Sunaga; Ryo Natsuaki; Akira Hirose 001 (IJCNN, 2020)

Synthetic Aperture Radar Flood Detection under Multiple Modes and Multiple Orbit Conditions: A Case Study in Japan on Typhoon Hagibis, 2019. - Ryo Natsuaki; Hiroto Nagai (Remote. Sens., 2020)

Consideration on Singular-Point Generating Mechanisms by Analyzing the Effect of Phase-and-Polarization Optimization in PolInSAR. - Yuta Otsuka; Tomoharu Shimada; Ryo Natsuaki; Akira Hirose 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2020)

Generalization characteristics of complex-valued reservoir computing for interferometric synthetic aperture radar applications. - Bungo Konishi; Akira Hirose 001; Ryo Natsuaki (APSIPA ASC, 2021)

Proposal of higher-order tensor independent component analysis for signal separation in multiple-input multiple-output respiration/heartbeat remote sensing*. - Seishiro Goto; Ryo Natsuaki; Akira Hirose 001 (EMBC, 2021)

Proposal of Complex-Valued Reservoir Computing for Topographic Aspect Classification. - Bungo Konishi; Akira Hirose 001; Ryo Natsuaki (IGARSS, 2021)

Proposal of PolSAR Land Classification Using Quaternion Convolutional Neural Networks. - Yuya Matsumoto; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2021)

Emulation of a Sar Interferogram from the Past Satellites for the Present Events. - Ryo Natsuaki; Ryu Sugimoto; Chiaki Tsutsumi; Ryosuke Nakamura (IGARSS, 2021)

Complex-Valued Reservoir Computing for Interferometric SAR Applications With Low Computational Cost and High Resolution. - Bungo Konishi; Akira Hirose 001; Ryo Natsuaki (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2021)

Proposal of Detection of Subsurface Objects with Model-Based Homogeneity to Extend Compressed Sensing. - Ryuta Imai; Yicheng Song; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2022)

Neural Network Model for Multi-Sensor Fusion and Inverse Mapping Dynamics for the Analysis of Significant Factors. - Gunjan Joshi; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2022)

InSAR Phase Unwrapping Using Dynamics of Coupled Phase Oscillators of the Kuramoto Model. - Bungo Konishi; Akira Hirose 001; Ryo Natsuaki (IGARSS, 2022)

Proposal of PolSAR Land Classification Using Full-Learning Quaternion Convolutional Neural Networks. - Yuya Matsumoto; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2022)

Polarimetric Analysis of RFI in L-Band SAR System. - Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2022)

An experiment of flooded building detection using ALOS-2 and a flood experiment field. - Masato Ohki; Ryo Natsuaki; Sadayoshi Aoyama; Takeo Tadono (IGARSS, 2022)

Predicting polarization state based on quaternion neural networks to facilitate channel prediction. - Haotian Chen; Ryo Natsuaki; Akira Hirose 001 (IJCNN, 2022)

Polarization-Aware Prediction of Mobile Radio Wave Propagation Based on Complex-Valued and Quaternion Neural Networks. - Haotian Chen; Ryo Natsuaki; Akira Hirose 001 (IEEE Access, 2022)

Full-Learning Rotational Quaternion Convolutional Neural Networks and Confluence of Differently Represented Data for PolSAR Land Classification. - Yuya Matsumoto; Ryo Natsuaki; Akira Hirose 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2022)

Model-Based Homogeneity to Extend Compressed Sensing for Ground Penetrating Radar. - Ryuta Imai; Yicheng Song; Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Geosci. Remote. Sens., 2022)

Skin-Penetrating Interfaces for Millimeter-Wave Non-Invasive Glucose Concentration Estimation: Numerical Analysis. - Lena Azuma; Ryo Natsuaki; Akira Hirose 001 (EMBC, 2023)

Estimation of Dielectric Constant Distribution Utilizing Subsurface Objects Based on Radar Image Focusing. - Ryuta Imai; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2023)

Target-Phase-Focused Feature Synthesis and Extraction for Weakly Scattering Objects in Ground Penetrating Radar. - Ryuta Imai; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2023)

Automated Determination of Normalized Indices Useful for Glacier Surface Classification. - Gunjan Joshi; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2023)

INSAR Phase Filtering By Attention-Based Reservoir Computing For High Reliability. - Bungo Konishi; Akira Hirose 001; Ryo Natsuaki (IGARSS, 2023)

Standardizing The Impact Assessment of Radio Frequency Interference (RFI) in Space-Based Remote Sensing: Challenges and Benefits. - Ryo Natsuaki; Roger Oliva; Raúl Díez-García; Mingliang Tao; Paolo de Matthaeis (IGARSS, 2023)

Urban Damage Detection Using Temporally Stacked Synthetic Aperture Radar Interferometric Coherence. - Ryo Natsuaki; Ryu Sugimoto; Masanobu Shimada; Chiaki Tsutsumi; Ryosuke Nakamura (IGARSS, 2023)

Proposal of Biquaternion Neural Networks for Coherent Processing of Polarization-and-Phase Information in Polsar and Polinsar. - Yuta Otsuka; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2023)

Landmine Detection Based on Generalized Riemannian Quaternion Self-Organizing Map. - Yicheng Song; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2023)

Extending Observation Coverage of SAR by Separating Range Ambiguous Signals Using PN-sequences. - Raito Suzuki; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2023)

Symbol Detection for Polarization Shift Keying Based on Quaternion Neural Networks. - Haotian Chen; Ryo Natsuaki; Akira Hirose 001 (IJCNN, 2023)

Reservoir Computing for Symbol Detection of Optical Wireless Scattering Communications. - Haotian Chen; Ryo Natsuaki; Akira Hirose 001 (IJCNN, 2023)

Neural Network Fusion Processing and Inverse Mapping to Combine Multisensor Satellite Data and Analyze the Prominent Features. - Gunjan Joshi; Ryo Natsuaki; Akira Hirose 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2023)

Application of Inverse Mapping for Automated Determination of Normalized Indices Useful for Land Surface Classification. - Gunjan Joshi; Ryo Natsuaki; Akira Hirose 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2023)

Riemannian Quaternion Self-Organizing Map to Overcome Degree-of-Polarization Error in Polarimetric Ground-Penetrating Radar. - Yicheng Song; Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Geosci. Remote. Sens., 2023)

Wrist measurement for millimeter-wave non-invasive glucose monitoring: Numerical analysis of an anatomically realistic tissue model. - Lena Azuma; Ryo Natsuaki; Akira Hirose 001 (EMBC, 2024)

Utilizing Small and Large Spectral Radii for Appropriate Reservoir Computing Design. - Bungo Konishi; Akira Hirose 001; Ryo Natsuaki (ICONIP (1), 2024)

P4006: An IEEE Standard in Development for RFI Impact Assessment. - Raúl Díez-García; Roger Oliva; Ryo Natsuaki; Priscilla N. Mohammed; Beau Backus; Mingliang Tao; Paolo de Matthaeis (IGARSS, 2024)

Comparison of Temporal Decorrelation Decay Functions Over Land Cover Types for L- and C-vand SAR. - Yukio Endo; Yu Morishita; Ryu Sugimoto; Ryo Natsuaki; Masanobu Shimada; Chiaki Tsutsumi; Toru Kouyama; Ryosuke Nakamura (IGARSS, 2024)

RFI Detection Using Degree of Polarization for Polarimetric Synthetic Aperture Radar. - Yu Hashimoto; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2024)

Complex-Valued Neural-Network Inverse Mapping for Explainability in PolSAR/InSAR Applications. - Gunjan Joshi; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2024)

Polarimetric Goldstein Filter for Interferometric Phase Denoising. - Yuta Otsuka; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2024)

Landmine Detection Based on Riemannian Phasor Quaternion Self-Organizing Map. - Yicheng Song; Ryo Natsuaki; Akira Hirose 001 (IGARSS, 2024)

Characterization of Systematic Bias in ALOS-2 Multilooked Interferograms. - Ryu Sugimoto; Yu Morishita; Masanobu Shimada; Ryo Natsuaki; Chiaki Tsutsumi; Ryosuke Nakamura; Toru Kouyama (IGARSS, 2024)

Optimizing PN-Sequences with Genetic Algorithm for SAR Waveform Diversity. - Raito Suzuki; Akira Hirose 001; Ryo Natsuaki (IGARSS, 2024)

Time-series Forecasting Coding: A New Processing Method Developed from Predictive Coding for Recurrent Neural Networks. - Yuto Wakui; Junya Kato; Ryo Natsuaki; Akira Hirose 001 (IJCNN, 2024)

Removal of Synthetic Aperture Radar Range Ambiguity by Observing Adjacent Regions. - Raiki Kudo; Akira Hirose 001; Ryo Natsuaki (IEEE Geosci. Remote. Sens. Lett., 2024)

Time Series Scattering Power Decomposition Using Ensemble Average in Temporal-Spatial Domains: Application to Forest Disturbance Detection. - Ryu Sugimoto; Ryo Natsuaki; Ryosuke Nakamura; Chiaki Tsutsumi; Yoshio Yamaguchi (IEEE Geosci. Remote. Sens. Lett., 2024)

Multisensor Glacier Surface Classification Using Confidence-Aware Explainable Inverse-Mapping Neural Network. - Gunjan Joshi; Celia A. Baumhoer; Andreas J. Dietz; Ryo Natsuaki; Akira Hirose 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2024)

Biquaternion Fourier Domain Filter for InSAR Noise Suppression by Enhancing Polarimetric-Interferometric Fringe Patterns. - Yuta Otsuka; Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Geosci. Remote. Sens., 2024)

Quaternion Neural Networks: A physics-incorporated intelligence framework [Hypercomplex Signal and Image Processing]. - Akira Hirose 001; Fang Shang; Yuta Otsuka; Ryo Natsuaki; Yuya Matsumoto; Naoto Usami; Yicheng Song; Haotian Chen (IEEE Signal Process. Mag., 2024)

Robust Symbol Detection Based on Quaternion Neural Networks in Wireless Polarization-Shift-Keying Communications. - Haotian Chen; Ryo Natsuaki; Akira Hirose 001 (IEEE Trans. Neural Networks Learn. Syst., 2024)

Degree-of-Polarization-Based Radio Frequency Interference Detection for Synthetic Aperture Radar. - Yu Hashimoto; Akira Hirose 001; Ryo Natsuaki (IEEE Trans. Geosci. Remote. Sens., 2025)