This paper presents a new modeling method for a general curved surface and a more efficient scattering model to account for the scattering contribution of complex targets with shaped external surface. Before RCS analy...This paper presents a new modeling method for a general curved surface and a more efficient scattering model to account for the scattering contribution of complex targets with shaped external surface. Before RCS analysis, the actual external surface is divided into facets with different shapes. The calculation for scattering field of a single facet is based on PO PTD (Physical optics Physical theory of diffraction) model and the whole scattering field of the target can be obtained by phase synthesis. A calculation example is given to verify the validity of both the model and the modeling method. Time dependence e jwt is suppressed throughout this paper.展开更多
下滑信标是仪表着陆系统的重要组成部分,为进近中的航空器提供垂直方位引导。进行障碍物对下滑信标信号影响的精确分析可以为导航台站选址及解决导航台运行中存在的问题提供理论依据。本文基于物理光学-物理绕射理论(Physical optics-ph...下滑信标是仪表着陆系统的重要组成部分,为进近中的航空器提供垂直方位引导。进行障碍物对下滑信标信号影响的精确分析可以为导航台站选址及解决导航台运行中存在的问题提供理论依据。本文基于物理光学-物理绕射理论(Physical optics-physical theory of diffraction,PO-PTD)算法,结合空客A320-200型客机以及机场三维模型对下滑信标的下滑道结构影响进行了静态分析。在静态分析的基础上,对飞机在滑行道上滑行且五边上有飞机进近时的影响进行了动态研究,找出了某机场飞行员长期反映的下滑道信号不稳问题的原因。动态研究数据与飞行校验结果进行了比对并与飞行校验结果吻合。展开更多
文摘This paper presents a new modeling method for a general curved surface and a more efficient scattering model to account for the scattering contribution of complex targets with shaped external surface. Before RCS analysis, the actual external surface is divided into facets with different shapes. The calculation for scattering field of a single facet is based on PO PTD (Physical optics Physical theory of diffraction) model and the whole scattering field of the target can be obtained by phase synthesis. A calculation example is given to verify the validity of both the model and the modeling method. Time dependence e jwt is suppressed throughout this paper.
文摘下滑信标是仪表着陆系统的重要组成部分,为进近中的航空器提供垂直方位引导。进行障碍物对下滑信标信号影响的精确分析可以为导航台站选址及解决导航台运行中存在的问题提供理论依据。本文基于物理光学-物理绕射理论(Physical optics-physical theory of diffraction,PO-PTD)算法,结合空客A320-200型客机以及机场三维模型对下滑信标的下滑道结构影响进行了静态分析。在静态分析的基础上,对飞机在滑行道上滑行且五边上有飞机进近时的影响进行了动态研究,找出了某机场飞行员长期反映的下滑道信号不稳问题的原因。动态研究数据与飞行校验结果进行了比对并与飞行校验结果吻合。
