研究者詳細 - 山田　寛喜

論文 - 山田　寛喜

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複数給電型パラサイトアレーにおける適応指向性制御の高速化

森下雅透, 山田寛喜, S.Chen, 太郎丸真, 大平孝

電子情報通信学会ソサイエティ大会 ( B-1-184 ) 2007年9月

Simple detection method of forested area by the correlation coefficients in the circular polarization basis using the X-band Pi-SAR data 査読

Y. Yamaguchi, Y. Yamamoto, R. Sato, H. Yamada

Electronic Proc. of ASAR Workshop 2007 2007年9月

POLSAR image analysis of wetlands using fully polarimetric quad-SAR data 査読

Y. Yamaguchi, H. Yamada, Y. Yajima, R. Sato, W. -M. Boerne

Electronic Proc. of ASAR Workshop 2007 2007年9月

FDTD法を用いた簡易人工物モデルの偏波散乱解析

浅川雄祐, 佐藤亮一, 山口芳雄, 山田寛喜

2007年度電子情報通信学会信越支部大会 ( 3D-3 ) 58 2007年9月

円偏波相関係数を用いたPOLSAR画像解析(1)

逸見祐輔, 山口芳雄, 山田寛喜

2007年度電子情報通信学会信越支部大会 ( 2A-5 ) 25 2007年9月

独立成分分析を用いた素子間相互結合および素子特性の校正手法

島田裕平, 山田寛喜, 山口芳雄

2007年度電子情報通信学会信越支部大会 ( 3C-1 ) 51 2007年9月

三角アレー送信側SSPによるコヒーレント波の相関抑圧特性

遠藤奈津美, 山田寛喜, 山口芳雄

2007年度電子情報通信学会信越支部大会 3 ( 3C-3 ) 53 - 53 2007年9月

Consideration on Adaptive Beamforming of the MuPAR Antenna

Masayuki Morishita, Hiroyoshi Yamada, Chen Sun, Makoto Taromaru, Takashi Ohira

2007年度電子情報通信学会信越支部大会 ( 10C-3 ) 225 2007年9月

Decorrelation performance of spatial smoothing preprocessing at transmitter in the presence of multipath coherent waves 査読

Natsumi Endo, Hiroyoshi Yamada, Yoshio Yamaguchi

IEICE TRANSACTIONS ON COMMUNICATIONS E90B ( 9 ) 2297 - 2302 2007年9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

Direction of arrival estimation of coherent multipath waves by using superresolution technique often requires decorrelation preprocessings. Spatial smoothing preprocessings are the most popular schemes as the techniques. In mobile environment, position change of the target/transmitter often brings us decorrelation effect. In addition, multiple signals transmitted by an antenna array, such as a MIMO transmitter, can also cause the same effect. These effects can be categorized as the spatial smoothing preprocessing at the transmitter. In this paper, we analyze the spatial smoothing effect at the transmitter in the presence of multipath coherent waves. Theoretical and simulation results show that the spatial smoothing at the transmitter has a good feature in comparison with the conventional SSP at the receiving array. We also show that better decorrelation performance can be obtained when the SSPs at the transmitter and receiving array are applied simultaneously.

DOI： 10.1093/ietcom/e90-b.9.2297

Web of Science

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Investigation on seasonal water area change in Lake Sakata based on POLSAR image analysis 査読

Ryoichi Sato, Yuki Yajima, Yoshio Yamaguchi, Hiroyoshi Yamada

IEICE TRANSACTIONS ON COMMUNICATIONS E90B ( 9 ) 2369 - 2375 2007年9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

This paper examines seasonal change of the true water area of Lake "Sakata" by using 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 the lake. Statistical POLSAR image analysis is carried out for both X- and L-band data, based on the three-component scattering power decomposition method, where the decomposed components are surface scattering, double-bounce scattering and volume scattering components. From the results of the image analysis for the L-band POLSAR data acquired by Pi-SAR system, it is found that strong double-bounce scattering can be observed at the vicinity of the boundary region between water area and the surrounding emerged-plants area in early and middle summer. This phenomenon is an important factor for environmental monitoring. To verify the generating mechanism of the double-bounce scattering, the Finite-Difference Time-Domain (FDTD) polarimetric scattering analysis is also executed for a simplified boundary model, which simulates the local boundary region around the lake and consists of lots of vertical thin dielectric pillars on a perfect electric conductor (PEC) plate or on a PEC and dielectric hybrid plate. Taking into account the polarimetric feature of the double-bounce scattering obtained by both the FDTD and POLSAR image analyses, one can distinguish the actual water area from the bush of the emerged-plants around the lake, even when the water area is concealed by emerged-plants and/or floating-leave plants. Consequently, it is found that by using the proposed approach, one can estimate the true water area seasonal change for the lake and the surrounding wetland.

DOI： 10.1093/ietcom/e90-b.9.2369

Web of Science

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A simple mutual coupling compensation technique in array of single-mode elements by a weighted mutual coupling matrix based on the impedance matrix 査読

Hiroyoshi Yamada, Masayuki Morishita, Yoshio Yamaguchi

IEICE TRANSACTIONS ON COMMUNICATIONS E90B ( 9 ) 2288 - 2296 2007年9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 techniques for antenna arrays have been widely desired in many applications such as smart antennas, RF position location, and RFID system. To realize high-resolution capability of the techniques, precise array calibration is necessary. For an array of single-mode elements. a calibration matrix derived by the open-circuit method is the simplest one. Unfortunately, calibration performance of the method is not enough for the high-reslution DOA estimation techniques. In this paper, we consider problems of the calibration matrix derived by the method, and show that errors in the matrix can be effectively removed by an optimal diagonal weight coefficient. In the proposed compensation technique, the number of newly introduced parameters, or unknowns. is only one for an array of the identical elements. Performance of the simple compensation technique is verified numerically and experimentally.

DOI： 10.1093/ietcom/e90-b.9.2288

Web of Science

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POLSAR IMAGE ANALYSIS FOR WETLANDS MONITORING BASED ON A MODIFIED FOUR-COMPONENT SCATTERING POWER DECOMPOSITION 査読

Yuki Yajima, Ryoichi Sato, Yoshio Yamaguchi, Hiroyoshi Yamada, Wolfgang-Martin Boerner

Proc. of 2007 International Symposium on Antennas and Propagation (ISAP2007) 2007年8月

PRELIMINARY RESULT OF ALOS/PALSAR FULLY POLARIMETRIC DATA AND ITS COMPARISON WITH PI-SAR DATA 査読

Xin Xu, Yoshio Yamaguchi, Yuki Yajima, Hiroyoshi Yamada

Proc. of 2007 International Symposium on Antennas and Propagation (ISAP2007) 2007年8月

CLASSIFICATION OF TERRAIN USING THE CORRELATION COEFFICIENT IN THE CIRCULAR POLARIZATION BASIS FOR X-BAND POLSAR DATA 査読

Yukari Yamamoto, Yoshio Yamaguchi, Hiroyoshi Yamada, Ryoichi Sato, Jian Yang

Proc. of 2007 International Symposium on Antennas and Propagation (ISAP2007) 2007年8月

Performance of Adaptive Beamforming with Multiport Parasitic Array Radiator Antenna 査読

Morishita Masayuki, Chen Sun, Taromaru Makoto, Yamada Hiroyoshi, Ohira Takashi

International Symposium on Antennas and Propagation = International Symposium on Antennas and Propagation ( 2007 ) 764 - 767 2007年8月

Interference Cancellation Performance of Adaptive Array of ESPAR antennas 査読

Kataoka Eitaro, Morishita Masayuki, Yamada Hiroyoshi, Taromaru Makoto, Ohira Takashi, Yamaguchi Yoshio

International Symposium on Antennas and Propagation = International Symposium on Antennas and Propagation ( 2007 ) 760 - 763 2007年8月

TARGET DETECTION WITH SURFACE AND RADIATION MODE OF LEAKY COAXIAL CABLE 査読

Kenji Inomata, Takashi Hirai, Yoshio Yamaguchi, Hiroyoshi Yamada

Proc. of 2007 International Symposium on Antennas and Propagation (ISAP2007) 2 510 - 513 2007年8月

DOA ESTIMATION OF COHERENT WAVES BY USING SPATIAL SMOOTHING PREPROCESSINGS IN TRANSMITTER 査読

Natsumi Endo, Hiroyoshi Yamada, Yoshio Yamaguchi

Proc. of 2007 International Symposium on Antennas and Propagation (ISAP2007) 2007年8月

DEVELOPMENT OF THE FULLY POLARIMETRIC FM-CW SAR AND THE COHERENT DECOMPOSITION OF TARGET 査読

Kazuyasu Aoyama, Muneyuki Ikarashi, Jun Nakamura, Yoshio Yamaguchi, Hiroyoshi Yamada

Proc. of 2007 International Symposium on Antennas and Propagation (ISAP2007) 2007年8月

FULLY POLARIMETRIC AND INTERFEROMETRIC FM-CW SAR SYSTEM AND ITS PRELIMINARY MEASUREMENT RESULTS 査読

Jun Nakamura, Kazuyasu Aoyama, Muneyuki Ikarashi, Yoshio Yamaguchi, Hiroyoshi Yamada

Proc. of 2007 International Symposium on Antennas and Propagation (ISAP2007) 2007年8月

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