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典型抛面天线的空域极化特性及散射矩阵测量方法 被引量:3
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作者 戴幻尧 罗佳 +2 位作者 李金梁 李永帧 王雪松 《信号处理》 CSCD 北大核心 2009年第9期1347-1352,共6页
单极化雷达天线的极化特性在空域中并非一成不变,而是按一定规律变化的。本文研究了抛面反射天线的空域极化特性,通过数值计算验证了天线极化状态在不同空域指向上分布的规律。并以此为基础,讨论了立足于现有的单极化雷达,仅需一个极化... 单极化雷达天线的极化特性在空域中并非一成不变,而是按一定规律变化的。本文研究了抛面反射天线的空域极化特性,通过数值计算验证了天线极化状态在不同空域指向上分布的规律。并以此为基础,讨论了立足于现有的单极化雷达,仅需一个极化通道对天线接收到雷达回波电压进行处理,完成雷达目标极化散射矩阵估计的方法。该法将可以大幅度的降低生产成本和设备复杂度,具有一定的理论参考价值和应用前景。 展开更多
关键词 抛面反射天线 空域极化特性 交叉极化分量 极化比 目标散射矩阵测量
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Optical Design of a Solar Parabolic Concentrating Collector Based on Trapezoidal Reflective Petals
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作者 Sasa Pavlovic Velimir Stefanovic +1 位作者 Darko Vasiljevic Emina Petrovic 《Journal of Energy and Power Engineering》 2015年第8期714-720,共7页
In this paper, detailed optical of the solar parabolic dish concentrator is presented. The system has diameter D = 2,800 mm and focal length f = 1,400 mm. The efficient conversion of solar radiation in heat at these t... In this paper, detailed optical of the solar parabolic dish concentrator is presented. The system has diameter D = 2,800 mm and focal length f = 1,400 mm. The efficient conversion of solar radiation in heat at these temperature levels requires a use of concentrating solar collectors. In this paper, detailed optical design of the solar parabolic dish concentrator is presented. The parabolic dish of the solar system consists from 12 curvilinear trapezoidal reflective petals. This paper presents optical simulations of the parabolic solar concentrator unit using the ray-tracing software TracePro. The total flux on receiver and the distribution of irradiance for absorbed flux on center and periphery receiver are given. The total flux at the focal region is 4,031.3 W. The goal of this paper is to present optical design of a low-tech solar concentrator, that can be used as a potentially low-cost tool for laboratory-scale research on the medium-temperature thermal processes, cooling, industrial processes, solar cooking and polygeneration systems, etc. 展开更多
关键词 Solar parabolic dish concentrator optical analysis solar energy solar radiation.
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