To study bistatic scattering from a target at low altitude above two- dimensional (2D) randomly rough sea surface under an electromagnetic (EM) wave incidence at low grazing angle (LGA), a numerical approach of the fi...To study bistatic scattering from a target at low altitude above two- dimensional (2D) randomly rough sea surface under an electromagnetic (EM) wave incidence at low grazing angle (LGA), a numerical approach of the finite element method (FEM) is developed. The conformal perfectly matched layer (PML), as the truncation boundary of the FEM, is employed to reduce the reflection error of planar PML in conventional FEM. Numerical code of our FEM is examined by available solution of the forward backward iterative (FBM) method. Bistatic and back-scattering from composite model of a target above random rough sea surface generated by Monte Carlo realization, and functional dependence upon the sea surface wind speed, target altitude, incident and scattering angles, etc. are numerically simulated and discussed. This paper presents a numerical description of the observation principle and physical insight associated with the coupling interactions of a complex volumetric target and random rough sea surface.展开更多
在多波束测深系统的换能器安装与使用过程中,由于无法保证换能器坐标系统与船体坐标系统完全重合,因此必须进行横摇、纵倾以及航向偏差校准与改正,使两者坐标系统相一致。详细分析了多波束测深系统换能器安装校准的原理和方法,以"...在多波束测深系统的换能器安装与使用过程中,由于无法保证换能器坐标系统与船体坐标系统完全重合,因此必须进行横摇、纵倾以及航向偏差校准与改正,使两者坐标系统相一致。详细分析了多波束测深系统换能器安装校准的原理和方法,以"亚美通道"海底光缆路由调查中,挪威Simrad EM 3000多波束测深系统的安装与校准为例,阐述了其安装校准方法及在海底地形测量中的应用。展开更多
基金the China State Key Basic Research Project (Grant No. 2001CB309401-05)the National Natural Science Foundation of China (Grant No. 60171009).
文摘To study bistatic scattering from a target at low altitude above two- dimensional (2D) randomly rough sea surface under an electromagnetic (EM) wave incidence at low grazing angle (LGA), a numerical approach of the finite element method (FEM) is developed. The conformal perfectly matched layer (PML), as the truncation boundary of the FEM, is employed to reduce the reflection error of planar PML in conventional FEM. Numerical code of our FEM is examined by available solution of the forward backward iterative (FBM) method. Bistatic and back-scattering from composite model of a target above random rough sea surface generated by Monte Carlo realization, and functional dependence upon the sea surface wind speed, target altitude, incident and scattering angles, etc. are numerically simulated and discussed. This paper presents a numerical description of the observation principle and physical insight associated with the coupling interactions of a complex volumetric target and random rough sea surface.
文摘在多波束测深系统的换能器安装与使用过程中,由于无法保证换能器坐标系统与船体坐标系统完全重合,因此必须进行横摇、纵倾以及航向偏差校准与改正,使两者坐标系统相一致。详细分析了多波束测深系统换能器安装校准的原理和方法,以"亚美通道"海底光缆路由调查中,挪威Simrad EM 3000多波束测深系统的安装与校准为例,阐述了其安装校准方法及在海底地形测量中的应用。
