研究者詳細 - 山田　寛喜

論文 - 山田　寛喜

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Experimental study on Polarimetric SAR Tomography using Pi-SAR-L2 data

Kenichiro Suzuki, Hiroyoshi Yamada, Masato Ohki, Yoshio Yamaguchi, Ryoichi Sato

ISAP 2018 - 2018 International Symposium on Antennas and Propagation 2019年1月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Recently, SAR Tomography (TomoSAR) which exploits multiple SAR datasets to reconstruct three-dimensional target imaging has been attracting attention in microwave remote sensing. The TomoSAR can reconstruct the image without occurring the geometric distortion such as foreshortening and layover which are the problems of conventional 2D-SAR, because it reconstructs the image in three-dimensional space. Especially, the TomoSAR with L-band radar can observe local scatterings inside the vegetation, so it can be applied to biomass estimation and vegetation monitoring. However, the TomoSAR in Pi-SAR-L2, which is the L-band airborne SAR, has not been realized yet. In this paper, we apply the TomoSAR processing to the Pi-SAR-L2 datasets and show that the 3D-imaging is possible. Furthermore, we show that we can discriminate the local scattering mechanisms of three-dimensional target by introducing polarimetric analysis based on the Pauli scattering vector.

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On Optimum Element Arrangements of MIMO Radar Based on the Khatri-Rao Product Virtual Array

Jumpei Konishi, Hiroyoshi Yamada, Yoshio Yamaguchi

ISAP 2018 - 2018 International Symposium on Antennas and Propagation 2019年1月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

High-resolution property is important for indoor location estimation radars. In order to realize high-resolution location estimation by using array radar, it is necessary to increase the number of elements. However, it is often difficult because of the cost. Therefore, the MIMO radar and the Khatri-Rao (KR) product virtual-array processing, that are techniques to increase the number of elements virtually, have been attracting attentions. We have shown that the number of virtual array elements can be effectively increased by using the MIMO radar with Minimum Redundancy Array (MRA) by the KR product virtual array processing. However, optimum arrangements to realize the largest virtual Uniform Linear Array (ULA) is still unclear. In this paper, we show the optimum element arrangements to have the largest-aperture virtual ULA when we apply the KR product virtual array processing to MIMO radar.

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On Doppler Ambiguity Estimation for Millimeter FM-CW Radar by Using MUSIC Algorithm

Takahiro Horiuchi, Hiroyoshi Yamada, Yoshio Yamaguchi, Michiyo Hiramoto

ISAP 2018 - 2018 International Symposium on Antennas and Propagation 2019年1月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Even though Pulse-Doppler radar estimates velocity by measuring phase shift amount between pulses, the visible Doppler range is limited by Pulse-Repetition-Interval (PRI). In radio wave, Doppler frequency occurs from moving target as well as sound wave and the phase shift information should include slightly in samples of individual pulses. In this study, MUSIC algorithm is applied to measure these minute shift. We show experimental results on Doppler shift amount estimation by using both fast-time and slow-time and show that the shift amount can be measured without depending on PRI.

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Analysis of Polarimetric Scattering from Dihedral Structure for Detecting Building Damaged by Mudflow. 査読

Ryoichi Sato, Kentaro Sasaki, Yoshio Yamaguchi, Hiroyoshi Yamada

2019 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2019, Yokohama, Japan, July 28 - August 2, 2019 907 - 910 2019年

A Fundamental Study on Vehicle Detection in Flooded Urban Area Using Quad-Polarimetric SAR Data. 査読

Takanori Ishikuro, Ryoichi Sato, Yoshio Yamaguchi, Hiroyoshi Yamada

IEICE Transactions 102-C ( 1 ) 38 - 45 2019年

Experimental Validation of Conifer and Broad-Leaf Tree Classification Using High Resolution PolSAR Data above X-Band. 査読

Yoshio Yamaguchi, Yuto Minetani, Maito Umemura, Hiroyoshi Yamada

IEICE Transactions 102-B ( 7 ) 1345 - 1350 2019年

Robust height reconstruction of buildings based on ESPRIT-TOMoSAR

Masanori Gocho, Hiroyoshi Yamada, Yoshio Yamaguchi, Ryoichi Sato, Shoichiro Kojima, Motofumi Arii

International Geoscience and Remote Sensing Symposium (IGARSS) 2019-January 1136 - 1139 2019年

掲載種別：研究論文（国際会議プロシーディングス）

TomoSAR is one of the methods which can perform three-dimensional (3-D) imaging with multiple SAR datasets by using Direction-of-Arrival (DOA) estimation techniques to reveal height distribution of scatterers. However, resolution of the TomoSAR is generally insufficient for height estimation of small objects on the ground surface. Also, if we employ a high resolution DOA estimation method for the height estimation, its performance is often degraded due to orbital error. To solve this problem, we employ ESPRIT algorithm and propose a new method named ESPRIT-TomoSAR. The ESPRIT algorithm is one of high resolution DOA estimation techniques using orthogonality between signal and noise subspace, it has not only high resolution performance equivalent to the MUSIC algorithm but also robustness for orbital error. In this paper, to verify effectiveness of the proposed method, we provide experimental results by using actual airborne SAR dataset. The experimental results show that the proposed method realizes high resolution and robustness for orbital error, and it is effective for a precise height estimation such as the structure analysis of buildings.

DOI： 10.1109/IGARSS.2019.8899878

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直接波を特定する高分解能電波到来方向推定による屋内位置検出査読

平田明史, 山田寛喜, 大平孝

電気学会論文誌Ｃ（電子・情報・システム部門誌） 139 ( 8 ) 900 - 909 2019年

記述言語：日本語出版者・発行元：一般社団法人電気学会

<p>In recent years, research and development of highly accurate position detection indoors have attracted attention. In this paper, we propose a new scheme to improve accuracy of position detection indoors, identifying the direct wave between BLE transmitter (TX) and BLE receiver (RX), applying RD-CUBA-MUSIC<sup>(1)</sup> to indoor multi-path environment. In the proposed scheme, the direction of radio wave arrival is estimated in both directions of TX→RX and RX→TX. Estimation accuracy is improved by collating the arrival directions of the pair of two-way direct wave candidates. This Direction-Of-Arrival (DOA) estimation for direct wave is sequentially executed with a plurality of RXs and indoor position of TX is detected using the DOAs and the corresponding RX positions. In RD-CUBA-MUSIC, we select a beam pattern with high correlation with the sinc function beam pattern as a beam pattern of the ESPAR antenna. Computer simulation shows that the proposed scheme can achieve a detection accuracy within 1 m in error at a 91% probability. It also shows within 0.5 m in error at 67% even though it is in an indoor multi-path environment.</p>

DOI： 10.1541/ieejeiss.139.900

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Experimental study on polarimetric-HoloSAR

Hiroki Shimoda, Yoshio Yamaguchi, Hiroyoshi Yamada

IEICE Communications Express 8 ( 4 ) 122 - 128 2019年

Model-based target classification using polarimetric similarity with coherency matrix elements

Maito Umemura, Yoshio Yamaguchi, Hiroyoshi Yamada

IEICE Communications Express 8 ( 3 ) 73 - 80 2019年

ALOS-2 polarimetric SAR observation of Hokkaido-Iburi-Tobu earthquake 2018

Yoshio Yamaguchi, Maito Umemura, Daichi Kanai, Kosuke Miyazaki, Hiroyoshi Yamada

IEICE Communications Express 8 ( 2 ) 26 - 31 2019年

Robust Height Reconstruction of Buildings Based on Esprit-Tomosar.

Masanori Gocho, Hiroyoshi Yamada, Yoshio Yamaguchi, Ryoichi Sato, Shoichiro Kojima, Motofumi Arii

2019 IEEE International Geoscience and Remote Sensing Symposium(IGARSS) 1136 - 1139 2019年

Study on Imaging Method and Doppler Effect for Millimeter Wave Automotive SAR 査読

Takumi Kobayashi, Hiroyoshi Yamada, Yuuichi Sugiyama, Shogo Muramatsu, Yoshio Yamagchi

Proc. of 2018 International Symposium on Antennas and Propagation (ISAP) 2018年10月

偏波合成開口レーダデータの散乱モデル電力分解について

山口芳雄, SINGH Gulab, 山田寛喜

電子情報通信学会論文誌 B(Web) J101-B ( 9 ) 638‐647 (WEB ONLY) 2018年9月

TDM‐MIMOレーダによる移動ターゲットのDOA推定誤差解析

大橋卓, 山田寛喜, 山口芳雄

電子情報通信学会論文誌 B(Web) J101-B ( 7 ) 528‐538 (WEB ONLY) 2018年7月

Characterization of L-Band MIMP SAR Data from Rice Paddies at Late Vegetative Stage 査読

Motofumi Arii, Hiroyoshi Yamada, Masato Ohki

IEEE Transactions on Geoscience and Remote Sensing 56 ( 7 ) 3852 - 3860 2018年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Institute of Electrical and Electronics Engineers Inc.

Insufficient validation for polarimetric decomposition techniques has led to its less perceived popularity for more than 20 years. The true composition ratio of scattering mechanisms within a radar backscatter should be essential to make polarimetric synthetic aperture radar (SAR) operational applications. To achieve this, a novel comprehensive approach to accurately identify the contribution of each scattering mechanism by a multi-incidence angle and multipolarimetric (MIMP) SAR observation combined with a theoretical model simulation is newly applied to L-band SAR data. Rice paddies in Niigata, Japan having a simple vegetation structure without topography were observed by Polarimetric and Interferometric Airborne SAR L-band 2, by gradually varying the flight path in terms of incidence angle. In addition to the MIMP SAR observation, a dominant scattering mechanism is reliably isolated through the theoretical characterization of the data by a discrete scatterer model. Avoiding unnecessary Bragg scattering effect caused by the methodically distributed rice paddies, the volume scattering from grains is identified as a dominant scattering mechanism over incidence angles. In addition, HH and VV are strongly affected by the double-bounce scattering between stalks and the ground surfaces at only small incidence angles, whereas the contribution of the double-bounce scattering for HV is not obvious. The results at the L-band will be compared with another MIMP SAR data at the X-band obtained for the same rice paddies in 2014 so that multifrequency MIMP SAR data analysis shall be conducted for our next step.

DOI： 10.1109/TGRS.2018.2814996

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Polarimetric Angle Utilization for Grasping State of Damaged Bridge

Ryoichi Sato, Toshiya Nebu, Takanori Ishikura, Yoshio Yamaguchi, Hiroyoshi Yamada

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium 2018年7月

Polarimetric Response from Conifer and Broad-Leaf Tree at Ku-Band in Anechoic Chamber

Yoshio Yamaguchi, Yuto Minetani, Hiroyoshi Yamada

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium 2018年7月

3-D imaging using SAR tomography with Pi-SAR2-X dataset 査読

Masanori Gocho, Hiroyoshi Yamada, Motofumi Arii, Shoichiro Kojima, Ryoichi Sato, Yoshio Yamaguchi

IEICE Transactions on Communications E101B ( 2 ) 409 - 417 2018年2月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Institute of Electronics, Information and Communication, Engineers, IEICE

SAR tomography is one of the methods that can perform 3-dimensional (3-D) imaging with multiple SAR datasets by using the Direction-of-arrival (DOA) estimation technique to estimate the height distribution of scatterers. Several reports on SAR tomography have been issued. However, experimental results of the SAR tomography by the Pi- SAR2-X, Japanese airborne SAR operated by the NICT, have not been reported yet. This paper is the first to report the results of experiments on the Japanese SAR platform. High-resolution 2-dimensional image can be obtained by the X-band SAR. However the image is generated by projecting 3-D objects in to a 2-D image plane, hence the target responses having the same slant-range distance locate at the same image pixel. This is well known as the layover problem. When we employ the X-band SAR tomography, we can obtain 3-D high-resolution images without the layover and also foreshortening problem. It will be useful for disaster damage monitoring, especially in urban areas. The main difficulty of the SAR tomography comes from the phase error caused by inaccurate flight-path data. In many cases, the dataset are preprocessed and compensated so as to parallelize their flight-path to carry out the phase calibration and the DOA estimation easily. However, it is often difficult for common users to obtain such preprocessed datasets. In this paper, we propose a simple calibration method by using a flat-surface area with known altitude. Experiments show that the proposed method is effective for the Pi-SAR2-X standard products without parallelized preprocessing or precise flight-path information.

DOI： 10.1587/transcom.2017ISP0020

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Optimum element arrangements in MIMO radar using Khatri-Rao product virtual array processing 査読

Konishi Jumpei, Yamada Hiroyoshi, Yamaguchi Yoshio

IEICE COMMUNICATIONS EXPRESS 7 ( 11 ) 407 - 414 2018年

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