研究者詳細 - 山田　寛喜

論文 - 山田　寛喜

分割表示 893 件中 241 - 260 件目／全件表示 >>

Accuracy of 2-Dimensional Object Location Estimation Using Leaky Coaxial Cables 査読

Kenji Inomata, Yashio Yamaguchi, Hiroyoshi Yamada, Wataru Tsujita, Masahiro Shikai, Kazuhiko Sumi

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 59 ( 6 ) 2396 - 2403 2011年6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：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

The improvement of position estimation accuracy is a very important factor in various radar applications. This paper focuses on two-dimensional (2-D) location estimation in radar surveillance using leaky coaxial cables. A leaky coaxial cable is a kind of antenna and has recently attracted attention as a powerful tool for vehicle detection and as an intrusion detection sensor for perimeter security. We derive the Cramer-Rao bound (CRB) for a leaky coaxial cable sensing application and introduce the CRB ellipsoid to evaluate the accuracy of the 2-D location estimation of an object. The diameter and angle of a CRB ellipsoid indicates its error distribution. A leaky coaxial cable has an outer conductor with periodic slots. Its slot pattern determines the radiation characteristics such as the beam angle and harmonic radiation. We focus on the slot pattern to improve the estimation accuracy. Numerical analyses show that a slot pattern generating multi-beams improves the accuracy while single radiation is preferred for general use in communication applications.

DOI： 10.1109/TAP.2011.2143661

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Four-Component Scattering Power Decomposition With Rotation of Coherency Matrix 査読

Yoshio Yamaguchi, Akinobu Sato, Wolfgang-Martin Boerner, Ryoichi Sato, Hiroyoshi Yamada

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 49 ( 6 ) 2251 - 2258 2011年6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：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

This paper presents an improvement to a decomposition scheme for the accurate classification of polarimetric synthetic aperture radar (POLSAR) images. Using a rotation of the coherency matrix to minimize the cross-polarized component, the four-component scattering power decomposition is applied to fully polarimetric SAR images. It is known that oriented urban area and vegetation signatures are decomposed into the same volume scattering mechanism in the previous decompositions and that it is difficult to distinguish vegetation from oblique urban areas with respect to the radar direction of illumination within the volume scattering mechanism. It is desirable to distinguish these two scattering mechanisms for accurate classification although they exhibit similar polarimetric responses. The new decomposition scheme by implementing a rotation of the coherency matrix first and, subsequently, the four-component decomposition yields considerably improved accurate results that oriented urban areas are recognized as double bounce objects from volume scattering.

DOI： 10.1109/TGRS.2010.2099124

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On Array Calibration Technique for Multipath Reference Waves 査読

Hiroyoshi Yamada, Hiroshi Sakai, Yoshio Yamaguchi

IEICE TRANSACTIONS ON COMMUNICATIONS E94B ( 5 ) 1201 - 1206 2011年5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：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

High resolution direction-of-arrival (DOA) estimation algorithm for array antennas becomes popular in these days. However, there are several error factors such as mutual coupling among the elements in actual array. Hence array calibration is indispensable to realize intrinsic performance of the algorithm. In the many applications, it is preferable that the calibration can be done in the practical environment in operation. In such a case, the incident wave becomes coherent multipath wave. Calibration of array in the multipath environment is a hard problem, even when DOA of elementary waves is known. To realize array calibration in the multipath environment will be useful for some applications even if reference signals are required. In this report, we consider property of reference waves in the multipath environment and derive a new calibration technique by using the multipath coherent reference waves. The reference wave depends on not only the DOA but also complex amplitude of each elementary wave. However, the proposed technique depends on the DOA only. This is the main advantage of the technique. Simulation results confirm the effectiveness of the proposed technique.

DOI： 10.1587/transcom.E94.B.1201

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マルチアンテナセンサシステムの特性評価に関する検討招待

山田寛喜, 黒崎雄太, 西森健太郎, 山口芳雄

電子情報通信学会技術研究報告 RCS2011-8 ( 4 ) 41 - 46 2011年4月

実伝搬チャネルを用いた2x2MIMOセンサに適したアンテナ配置に関する考察招待

西森健太郎, 本間尚樹, 山田寛喜, 牧野秀夫

電子情報通信学会技術研究報告 RCS2011-5 ( 4 ) 25 - 30 2011年4月

マルチアンテナセンシングによる侵入検出のための電力変動検出に関する基礎検討

小川研, 山田寛喜, 山口芳雄

電子情報通信学会総合大会 ( B-1-203 ) 2011年3月

Brewster角を用いた植生の誘電率測定に関する基礎検討

渡邊卓磨, 山田寛喜, 有井基文, 小林弘一, 山口芳雄

電子情報通信学会総合大会 ( B-2-42 ) 2011年3月

一般化体積散乱成分を用いたPOLSAR画像の散乱成分分解に関する検討

滝沢竜之介, 山田寛喜, 山口芳雄

電子情報通信学会技術研究報告 SANE2010-150 ( 1 ) 71 - 76 2011年1月

実環境データに基づくMIMOセンサに適した素子間隔の考察

小出悠太, 西森健太郎, 本間尚樹, 桑原大輝, 山田寛喜, 牧野秀夫

電子情報通信学会技術研究報告 AP2010-149 ( 1 ) 97 - 102 2011年1月

非同期送信アンテナ分散配置環境における屋内侵入検出実験

田仲圭, 黒崎雄太, 山田寛喜, 西森健太郎, 山口芳雄

電子情報通信学会技術研究報告 AP2010-137 ( 1 ) 25 - 30 2011年1月

非同期送信アンテナ分散配置環境を想定した屋内侵入検出に関する検討

黒崎雄太, 山田寛喜, 西森健太郎, 辻宏之, 山口芳雄

電子情報通信学会技術研究報告 AP2010-136 ( 1 ) 19 - 24 2011年1月

拡張型体積散乱モデルを用いたモデルベースターゲット分類に関する検討

佐藤彰展, 山口芳雄, 山田寛喜

電子情報通信学会技術研究報告 SANE2010-149 ( 1 ) 65 - 70 2011年1月

Array calibration techniques for DOA estimation with arbitrary array using root-MUSIC algorithm 査読

Yoshiki Takahashi, Hiroyoshi Yamada, Yoshio Yamaguchi

2011 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications, IMWS-IWPT 2011 - Proceedings 235 - 238 2011年

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）

In recent years, high-resolution Direction of Arrival (DOA) estimation with an array antenna has become indispensable for various applications such as microwave-power transmission and reception. In actual measurement, however, DOA estimation accuracy is deteriorated by many error factors. Furthermore, almost all the computationally efficient DOA estimation algorithm can apply to the uniform arrays. In this report, we proposed the calibration method for Root-MUSIC which is low computationally efficient method with an arbitrary array. © 2011 IEEE.

DOI： 10.1109/IMWS.2011.5877119

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POLARIMETRIC SCATTERING FEATURE ESTIMATION FOR ACCURATE WETLAND BOUNDARY CLASSIFICATION 査読

Ryoichi Sato, Yoshio Yamaguchi, Hiroyoshi Yamada

2011 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS) 130 - 133 2011年

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：IEEE

This paper investigates polarimetric scattering characteristics from boundary region between the water area and the surrounding emerged plants in wetland, and proposes a simple true water area estimation method, by using both phi(HH)-phi(VV) and P-d in polarimetric synthetic aperture radar (PolSAR) image analysis. The true water area includes not only the body of water but also the water area under emerged-plants and/or floating-leave plants in wetland.
To verify the generating mechanism of the specific polarimetric scattering features, the Finite-Difference Time-Domain (FDTD) polarimetric scattering analysis is also carried out for a simplified boundary model, which simulates the local boundary region around the wetland and consists of lots of vertical thin dielectric pillars on a dielectric plate.
Taking into account the polarimetric feature obtained by both the FDTD and PolSAR image analyses, one can distinguish the actual water area from the emerged-plants around a wetland, even when the water area is concealed by emerged-plants and/or floating-leave plants. Resultantly, it is found that by using the proposed simple classification markers, one can estimate the true water area boundary for wetland and the surrounding emerged-plants.

DOI： 10.1109/IGARSS.2011.6048915

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FOUR-COMPONENT SCATTERING POWER DECOMPOSITION USING COHERENCY MATRIX 査読

Yoshio Yamaguchi

2011 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS) 1044 - 1047 2011年

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：IEEE

In this tutorial presentation, model-based scattering power decompositions for fully polarimetric SAR data analysis are reviewed, and a relevant four-component scattering power decomposition scheme is presented. Although the method is still not perfect, it provides us with intuitive imaging results by RGB color-coding based on the physical scattering mechanisms. By using a rotation of the coherency matrix to minimize the cross-polarized component, the result of the four-component decomposition becomes more significant with simple and easy calculation. It is shown that oriented urban areas or man-made structures are clearly distinguished from volume scattering as double bounce objects.

DOI： 10.1109/IGARSS.2011.6049374

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Indoor experiment on vegetation permittivity measurement using Brewster's angle

Takuma Watanabe, Hiroyoshi Yamada, Hirokazu Kobayashi, Yoshio Yamaguchi, Motofumi Arii

2011 3rd International Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2011 746 - 749 2011年

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）

Vegetation monitoring is one of the major applications of polarimetric synthetic aperture radar (PolSAR). In this paper, permittivity estimation method for vegetation by using multi-angle polarimetric radar is proposed. The method utilizes Brewster's angle of double-bounce scattering component. We demonstrate validity of the proposed method by indoor model experiments. We use a dihedral reflector and dipole cloud to obtain double-bounce scattering and volume scattering, respectively. The experimental results show that the proposed method works properly when volume scatterer exists. © 2011 KIEES.

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任意形状アレーにおけるRoot-MUSICを用いたDOA推定のためのアレー校正手法

高橋善樹, 山田寛喜, 山口芳雄

電子情報通信学会技術研究報告 AP2010-128 ( 12 ) 61 - 66 2010年12月

SAR軌道に対して傾いた市街地の分類に関する検討

下唐湊理, 山口芳雄, 山田寛喜, 児玉拓哉

第550回電波研連F分科会 2010年12月

偏波壁透過レーダの基礎検討

大川平, 山口芳雄, 山田寛喜

第550回電波研連F分科会 2010年12月

Utilization of fully polarimetric ALOS-PALSAR data 査読

Y.Yamaguchi, R.Sato, H.Yamada

The 4th Joint PI Symposium of ALOS Data Nodes for ALOS Science Program in Tokyo, 61 2010年11月

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