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1.

論文(リポジトリ)

論文(リポジトリ)
Yamaguchi, Yoshio ; Sato, Akinobu ; Boerner, Wolfgang Mart ; Sato, Ryoichi ; Yamada, Hiroyoshi
出版情報: IEEE transactions on geoscience and remote sensing — IEEE transactions on geoscience and remote sensing.  49  pp.2251-2258,  2011-06.  IEEE
本文リンク: http://hdl.handle.net/10191/19302
概要: This paper presents an improvement to a decomposition scheme for accurate classification of polarimetric SAR 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 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 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. 続きを見る
2.

論文(リポジトリ)

論文(リポジトリ)
Nakamura, Jun ; Aoyama, Kazuyasu ; Ikarashi, Muneyuki ; Yamaguchi, Yoshio ; Yamada, Hiroyoshi
出版情報: IEICE transactions on communications — IEICE transactions on communications.  E91-B  pp.2374-2379,  2008-07.  電子情報通信学会
本文リンク: http://hdl.handle.net/10191/23390
概要: This paper presents a coherent decomposition scheme for polarimetric SAR data. Coherent decomposition means the decomposition is applied to a single or a few scattering matrix data. Based on the scattering matrix acquired with an FM-CW polarimetric SAR system, we have devised a simple decomposition technique using the coherency matrix for the purpose of identifying scatterers. This paper presents the decomposition technique and some decomposition results obtained by a fully polarimetric FM-CW radar. It is shown the scattering mechanisms are well recovered and the orientation angles of wire scatterer are precisely measured. 続きを見る
3.

論文(リポジトリ)

論文(リポジトリ)
Hayashi, Kei ; Sato, Ryoichi ; Yamaguchi, Yoshio ; Yamada, Hiroyoshi
出版情報: IEICE transactions on communications.  E89-B  pp.191-195,  2006-01.  The Institute of Electronics, Information and Communication Engineers
本文リンク: http://hdl.handle.net/10191/21327
概要: This paper examines polarimetric scattering characteristics caused by a dihedral corner reflector of finite size. The dihedral corner reflector is a basic model of double-bounce structure in urban area. The detailed scattering information serves the interpretation of Polarimetric Synthetic Aperture Radar (POLSAR) data analysis. The Finite-Difference Time-Domain (FDTD) method is utilized for the scattering calculation because of its simplicity and flexibility in the target shape modeling. This paper points out that there exists a stable double-bounce squint angle region both for perfect electric conductor (PEC) and dielectric corner reflectors. Beyond this stable squint angular region, the scattering characteristics become completely different from the assumed response. A criterion on the double-bounce scattering is proposed based on the physical optics (PO) approximation. The detailed analyses on the polarimetric index (copolarization ratio) with respect to squint angle and an experimental result measured in an anechoic chamber are shown. 続きを見る
4.

論文(リポジトリ)

論文(リポジトリ)
Kimura, Koji ; Yamaguchi, Yoshio ; Moriyama, Toshifumi ; Yamada, Hiroyoshi
出版情報: IEICE transactions on communications — IEICE transactions on communications.  E87-B  pp.3050-3056,  2004-10.  The Institute of Electronics, Information and Communication Engineers
本文リンク: http://hdl.handle.net/10191/21325
概要: This paper proposes a method to detect buildings and houses whose walls are not parallel to Synthetic Aperture Radar (SAR) flight path. Experimental observations show that it is difficult to detect these targets because of small backscattering characteristics. The detection method is based on the correlation coefficient in the circular polarization basis, taking full advantage of Polarimetric SAR (POLSAR) data. Since the correlation coefficient is real-valued for natural distributed targets with reflection symmetry and for non-natural targets orthogonal to illumination direction, and it becomes a complex number for non-natural targets aligned not orthogonal to radar Line-Of-Sight (LOS), the value seems to be an effective index for detection of obliquely aligned non-natural targets. The detection results are shown using the X-band Polarimetric and Interferometric SAR (Pi-SAR) single-path data set in conjunction with other polarimetric indices. 続きを見る