Faculty Profiles - YAMADA Hiroyoshi

Papers - YAMADA Hiroyoshi

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PI-SAR polarimetric画像解析

木村晃治, 山口芳雄, 山田寛喜

平成11年電子情報通信学会信越支部大会 ( PA8 ) 1999.10

Direction-of-arrival estimation with nonuniform array by using MODE method

NAKAZAWA Tatsuya, YAMADA Hiroyoshi, YAMAGUCHI Yoshio

Technical report of IEICE. RCS AP99-123 ( 10 ) 127 - 133 1999.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Recently, in the Direction-of-arrival (DOA) estimation with an antenna array, superresolution techniques have become attracting methods because of its high resolution capability of resolving incoming waves. One of its method called MODE method can resolve coherent signals directly. However, the method is only applicable to uniform linear array. In this paper, we propose to apply MODE method with EM (Expectation Maximization) algorithm to DOA estimation of coherent signals in nonuniform array. Simulations and experimental results show that the proposed method is valid in this case.

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An Improvement and Performance Evaluation of T-bar Fed Slot Antenna Using Subsurface Radar

WAKITA Yoshiyuki, WATABE Seiichi, YAMADA Hiroyoshi, YAMAGUCHI Yoshio

Technical report of IEICE. SANE SANE99-77 ( 10 ) 7 - 13 1999.10

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

A T-bar fed slot antenna designed for subsurface radar has wide band and flat frequency characteristic. The antenna can operate from 250 MHz to 1000 MHz (where VSWR < 3). However, the antenna can not provide optimal performance for radar system without a proper matching circuit, because of an impedance mismatching between a radar circuit of 50 Ω and the antenna of 150 Ω. Therefore a radar image is degrade by reflected wave on input port of the antenna. In this paper, an impedance matching technique of the antenna is discussed. The impedance matching between a radar circuit and the antenna can be attained by optimizing the T-bar shape. As a result, flat frequency characteristic of VSWR < 2 over 350 MHz ∼ 1000 MHz is obtained.

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MUSIC法における電波到来方向推定精度の定量的考察

原六蔵, 山田寛喜, 山口芳雄

平成11年電子情報通信学会信越支部大会 ( N1 ) 1999.10

EMアルゴリズムを用いた多重波の高分解能到来方向推定

中沢達也, 山田寛喜, 山口芳雄

平成11年電子情報通信学会信越支部大会 ( PA7 ) 1999.10

地中探査レーダ用T-bar Fed Slot Antennaの給電部形状に関する考察

脇田喜之, 渡部清一, 山口芳雄, 山田寛喜

平成11年電子情報通信学会信越支部大会 ( N2 ) 1999.10

シグナルプロセッシングアレーとモバイル通信

山田寛喜, 山口芳雄, 仙石正和

電子情報通信学会誌 J82 ( 9 ) 917 - 921 1999.9

偏波平均化MUSIC法のコヒーレント波検出性能について Reviewed

山田寛喜, 山倉利春, 山口芳雄

電子情報通信学会論文誌B-II J82-B-II ( 9 ) 1739 - 1746 1999.9

３成分分解法によるポーラリメトリックSAR画像解析

木村晃治, 山口芳雄, 山田寛喜

電子情報通信学会ソサイエティ大会 ( B-1-26 ) 1999.9

PI-SARポーラリメトリック解析（１）

木村晃治, 山口芳雄, 山田寛喜, 小林達治, 梅原俊彦, 灘井章詞, 浦塚清峰

電子情報通信学会技術研究報告 SANE99-54 ( 9 ) 1999.9

EMアルゴリズムを用いたMODE法による電波の到来方向推定

中澤達也, 山田寛喜, 山口芳雄

電子情報通信学会ソサイエティ大会 ( B-1-3 ) 1999.9

Polarimetric Decomposition of Range-Aligned Radar Targets Reviewed

Hiroyoshi Yamada, Kenji Kitayama, Yoshio Yamaguchi

Proc. XXVI-th URSI General Assembly 880 1999.8

Classification of target buried in the underground by radar polarimetry Reviewed

T Moriyama, M Nakamura, Y Yamaguchi, H Yamada, WM Boerner

IEICE TRANSACTIONS ON COMMUNICATIONS E82B ( 6 ) 951 - 957 1999.6

Co-null of targets and co-null Abelian group Reviewed

J Yang, Y Yamaguchi, H Yamada

ELECTRONICS LETTERS 35 ( 12 ) 1017 - 1019 1999.6

Polarimetric Scattering Characteristics of Targets Aligned in the Range Direction

KITAYAMA Kenji, YAMAGUCHI Yoshio, YAMADA Hiroyoshi

IEICE technical report. Antennas and propagation AP99-27 ( 5 ) 35 - 42 1999.5

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

This rcport describes the polarimetric scattering charactcristics of multiple targets aligned in the range direction within a radar resolution. Since radar target such as terrain extends both in the range and in the along-track dirction, the backscattered wave undergoes multiple reflections. The problem in polarimetric radar is how to evaluate such a scattering matrix resultant from multiple reflected waves. This report examines the fundamental polarimetric scattering characteristics of multiple wires. The scattering matrices of composite wire are derived as a function of thei spacing, simulated by the FD-TD analysis, and then compared to the experimental data. It is shown that resultant scattering matrix changes with spacing and that the interpretation of scattering matrix by multiple target becomes difficult.

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偏波比による路面状況の識別

木村晃治, 山口芳雄, 山田寛喜

電子情報通信学会総合大会 ( B-1-29 ) 1999.3