講演抄録/キーワード |
講演名 |
2022-12-16 09:35
Radar Target Modeling by Employing Directional Point Source ○Hirokazu Kobayashi(Electromagnetic Wave System Lab.)・Hirohisa Oda(SOGO) SANE2022-76 |
抄録 |
(和) |
Electromagnetic scattering analysis using the point source is the most useful and simple method to evaluate radar performance, especially in imaging such as SAR and ISAR. In this case, we usually employ the point source as an omni-directional very small point scatterer. When calculating the radar image by point sources located on the surrounding outer boundary of the target, the point source modeling cannot sufficiently simulate actual scattering because of the scattering wave to the object inside due to their omni-directivity. In this paper, we propose a new concept that the added directional weighting function to the point source scatterer usually with omni-pattern, which leads a simple and low-cost method especially in radar image. The outside boundary of the radar target can be specifically expressed by an equation or positions of the spatial coordinates. Introducing a local coordinate around the regarding area so that deriving the outward normal vector, the point source can add the directional characteristics such as cosine pattern with arbitrary amplitude and phase information. Thus, it is considered that the analysis accuracy can be improved even with a point scatterer for 3D model that discretizes the actual outer shape of the target while keeping the computational cost relatively low. For the confirmation of this proposed method, we numerically calculate the 2D bistatic model of a conducting cylinder. |
(英) |
Electromagnetic scattering analysis using the point source is the most useful and simple method to evaluate radar performance, especially in imaging such as SAR and ISAR. In this case, we usually employ the point source as an omni-directional very small point scatterer. When calculating the radar image by point sources located on the surrounding outer boundary of the target, the point source modeling cannot sufficiently simulate actual scattering because of the scattering wave to the object inside due to their omni-directivity. In this paper, we propose a new concept that the added directional weighting function to the point source scatterer usually with omni-pattern, which leads a simple and low-cost method especially in radar image. The outside boundary of the radar target can be specifically expressed by an equation or positions of the spatial coordinates. Introducing a local coordinate around the regarding area so that deriving the outward normal vector, the point source can add the directional characteristics such as cosine pattern with arbitrary amplitude and phase information. Thus, it is considered that the analysis accuracy can be improved even with a point scatterer for 3D model that discretizes the actual outer shape of the target while keeping the computational cost relatively low. For the confirmation of this proposed method, we numerically calculate the 2D bistatic model of a conducting cylinder. |
キーワード |
(和) |
点波源 / 指向性パターン / バイスタティック散乱 / SAR/ISAR画像処理 / レーダ断面積 (RCS) / 近傍界遠方変換 (NFFFT) / / |
(英) |
point source / directional pattern / bistatic scattering / SAR/ISAR imaging / radar cross-section (RCS) / near-field to far-field transformation (NFFFT). / / |
文献情報 |
信学技報, vol. 122, no. 312, SANE2022-76, pp. 68-73, 2022年12月. |
資料番号 |
SANE2022-76 |
発行日 |
2022-12-08 (SANE) |
ISSN |
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 |
SANE2022-76 |
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