Faculty Profiles - YAMADA Hiroyoshi

Papers - YAMADA Hiroyoshi

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Stable Decomposition of Mueller Matrix

楊健, 山口芳雄, 山田寛喜

電子情報通信学会技術研究報告 AP97-91 ( 8 ) 29 - 34 1997.8

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

Huynen has provided a method to decompose a Mueller matrix into an average single target and a N-target (non-symmetric target and noises) in order to retrieve detailed target information. However, the decomposition sometimes fails in the presence of small error or noise in the elements of Mueller matrix. This paper attempts to improve Huynen's decomposition method. First, the definition of a stable decomposition is given, showing the importance and a problem of Huynen's approach by an example. Then a method is proposed to carry out stable decomposition, based on the Least Squares Method and the Newton's Method. Stability means the decomposition is not sensitive to errors. The proposed methods overcomes the problems on the unstable decomposition of Mueller matrix. Finally, two numerical examples are given, showing our method is superior to the methods of Huynen and Pottier.

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地中探査用T-barスロットアンテナのFDTD法解析

炭篤則, 脇田喜之, 山田寛喜, 山口芳雄, 藤本京平

電子情報通信学会技術研究報告 AP97-86 ( 8 ) 1997.8

On frequency dispersion estimation of electromagnetic scattering wave using modified Root-MUSIC algorithm

ITABA Naoto, YAMADA Hiroyoshi, YAMAGUCHI Yoshio

IEICE technical report. Antennas and propagation AP97-79 ( 7 ) 61 - 67 1997.7

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

The high-resolution capability of the superresolotion technique is available for analyzing the local mechanisms' of the electromagnetic scattering waves. In this paper, we apply the modified Root-MUSIC algorithm to the back scattering wave from the circular aperture of a cylindrical waveguide that contains frequency dispersive waves. Especially, we consider two types of SSP schemes, a pre- and a post-SSP techniques, for the modified Root-MUSIC algorithm, and show that the post-processing technique is stable. Furthermore, we show availability of a time-domain notch filtering scheme for the improvement of the estimation accuracy. In addition numerical and experimental results are shown to verify these results.

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On the classification of objects buried in the underground by radar polarimetry

森山敏文, 中村政文, 山口芳雄, 山田寛喜

電子情報通信学会技術研究報告 AP97-68 ( 7 ) 65 - 71 1997.7

校正用平行平板ターゲットによるPolarimetry calibrationの検討

北山健志, 山口芳雄, 山田寛喜

電子情報通信学会技術研究報告 AP97-69 ( 7 ) 1997.7

High-resolution scattering center estimation using polarization averaging MUSIC algorithm

山田寛喜, 山倉利春, 山口芳雄

電子情報通信学会技術研究報告 AP97-77 ( 7 ) 45 - 52 1997.7

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

Recently, estimation and resolution improvements utilizing the polarization information of electromagnetic wave have been attracting attention in the remote sensing and the indoor radio propagation analysis. Several modifications using the polarization gata have reported in superresolution techniques. In this paper, we propose a new modification concerning with decorrelation preprocessings for the technique. The method has two main advantages compared with the conventional one; 1)improved decorrelation performance, 2)increased the number of resolvable signals. The resolution improvement is achieved theoretically and experimentally.

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An equivalent sensitivity time control circuit for FM-CW radar Reviewed

H Kasahara, T Moriyama, Y Yamaguchi, H Yamada

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 80 ( 6 ) 1 - 7 1997.6

Polarization anisotropy係数による埋没物体の分類

森山敏文, 山口芳雄, 山田寛喜

電子情報通信学会総合大会 ( B-1-46 ) 1997.3

スーパレゾリューション法による高分解能ポーラリメトリックイメージング

山田寛喜, 大西和則, 山口芳雄

電子情報通信学会総合大会 ( B-1-44 ) 1997.3

Radar polarimetry applied to the classification of target buried in the underground Reviewed

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

WIDEBAND INTERFEROMETRIC SENSING AND IMAGING POLARIMETRY 3120 ( 3120-13 ) 182 - 189 1997

Polarimetric superresolution technique for 2-D radar target imaging Reviewed

H Yamada, K Onishi, Y Yamaguchi

WIDEBAND INTERFEROMETRIC SENSING AND IMAGING POLARIMETRY 3120 ( 3120-23 ) 317 - 326 1997

Resolution improvement of the MUSIC algorithm utilizing two differently polarized antennas Reviewed

T Yamakura, H Yamada, Y Yamaguchi

IEICE TRANSACTIONS ON COMMUNICATIONS E79B ( 12 ) 1827 - 1832 1996.12

FM-CWレーダにおける等価STC回路について Reviewed

笠原一, 森山敏文, 山口芳雄, 山田寛喜

電子情報通信学会論文誌B-II J79-B-II ( 9 ) 583 - 588 1996.9

Polarimetric detection of objects by a deep sounding FM-CW radar Reviewed

Y.Yamaguchi, H.Kasahara, T.Moriyama, H.Yamada

Proc. of International Symposium on Ground Penetrating Radar 373 - 376 1996.9

An equivalent time sensitivity control technique for polarimetric FM-CW radar Reviewed

T.Moriyama, H.Kasahara, Y.Yamaguchi, H.Yamada

Proc. of International Symposium on Antennas and Propagation (ISAP'96) 4 ( 4 ) 1053 - 1056 1996.9

Polarimetric calibration for a synthetic aperture FM-CW radar Reviewed

Y.Yamaguchi, Y.Takayanagi, H.Yamada

Proc. of International Symposium on Antennas and Propagation (ISAP'96) 4 ( 4 ) 1049 - 1052 1996.9

A new method to obtain the optimal polarization states in the co-polarized channel Reviewed

J.Yang, Y.Yamaguchi, H.Yamada

Proc. of International Symposium on Antennas and Propagation (ISAP'96) 4 ( 4 ) 1029 - 1032 1996.9

MUSIC algorithm for the delay time and the polarization estimation Reviewed

H.Yamada, T.Yamakura, Y.Yamaguchi

Proc. of International Symposium on Antennas and Propagation (ISAP'96) 3 ( 3 ) 737 - 740 1996.9

A new method for characterizing radar target Reviewed

J.Yang, Y.Yamaguchi, H.Yamada

Proc. of International Symposium on Antennas and Propagation (ISAP'96) ( 4 ) 1029 - 1032 1996.9

ホーンアンテナを用いたFM-CWレーダにおける分解能劣化補正の検討

笠原一, 山口芳雄, 山田寛喜

平成８年度電子情報通信学会信越支部大会 ( V-14 ) 27 - 28 1996.9

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