講演抄録/キーワード |
講演名 |
2009-11-02 15:15
Dependency of Backscattering from Ocean Surface on Wind Direction by using Pi-SAR
-- Low wind speed case -- ○Akitsugu Nadai・Toshihiko Umehara・Takeshi Matsuoka・Makoto Satake・Tatsuharu Kobayashi・Seiho Uratsuka(NICT) SANE2009-95 |
抄録 |
(和) |
(まだ登録されていません) |
(英) |
The dependency of backscattering from ocean surface on wind direction under relatively weak wind speed (~5m/s) is analyzed using observation data with three directions of illumination by an airborne dual-frequency synthetic aperture radar (SAR) in the L- and X-bands. In the X-band, the dependencies of the NRCSs in the parallel polarizations show different features each other. The NRCS difference between up- and down-wind conditions depends on the incidence angle in the X-band HH polarization, though that in the VV polarization, the NRCS difference is almost zero. Moreover, the NRCS difference between parallel- and cross-wind conditions in VV polarization is greater than that in the HH polarization. Though the dependency of the NRCS in the L-band on the wind direction is smaller than that in the X-band, the NRCSs in the L-band cross polarizations under the cross-wind condition is greater than that under the parallel-wind condition. The polarization ratio (PR) in the X-band shows the dependency on the wind direction. The PR difference between up- and down-wind directions depends on the incidence angle as the incidence angle dependency in the X-band HH polarization. The dependency of the PR in the L-band on wind direction is also weaker than that in the X-band. The results suggest the possibility of ocean wind measurement using the polarimetric SAR in the X-band and/or using the dual-frequency SAR. |
キーワード |
(和) |
/ / / / / / / |
(英) |
ocean winds / radar cross section / polarization ratio / synthetic aperture radar / / / / |
文献情報 |
信学技報, vol. 109, no. 265, SANE2009-95, pp. 73-78, 2009年11月. |
資料番号 |
SANE2009-95 |
発行日 |
2009-10-26 (SANE) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
SANE2009-95 |