Rectangular reflector antennas have motivated the time-domain analysis of electromagnetic scattering problems. The asymptotic time domain physical-optics (TDPO) is applied to the analysis of a rectangular reflector il...Rectangular reflector antennas have motivated the time-domain analysis of electromagnetic scattering problems. The asymptotic time domain physical-optics (TDPO) is applied to the analysis of a rectangular reflector illuminated by a Gaussian-impulse. The effects of time-delayed mutual coupling between points on the surface will be ignored as a result of utilizing the TDPO method for determining the equivalent surface-current density on the reflector. Finally, in this work the scattered signals at the specular reflection point, at the edges, and at the corners can be clearly distinguished.展开更多
随着现代社会对电力系统稳定性和效率的要求日益提高,光纤通信技术在远程电力监控系统中的应用变得尤为关键。文章从光纤通信的基本原理出发,对比分析光纤与传统电缆的优势,并详细分析光纤在数据传输高效性、实时监控和故障检测等方面...随着现代社会对电力系统稳定性和效率的要求日益提高,光纤通信技术在远程电力监控系统中的应用变得尤为关键。文章从光纤通信的基本原理出发,对比分析光纤与传统电缆的优势,并详细分析光纤在数据传输高效性、实时监控和故障检测等方面的应用。此外,深入讨论光纤监控系统中远程光纤测试系统(Remote Fiber Test System,RFTS)、光时域反射仪(Optical Time Domain Reflectometer,OTDR)以及地理信息系统(Geographical Information System,GIS)等关键组件的作用和功能。文章全面概述光纤通信在远程电力监控系统中的应用,强调光纤通信技术对于提高电力系统运行效率和可靠性的重要性。展开更多
The transient backscattering mechanisms of a dipole array with reflector have been investigated from different aspects： time-domain, frequency-domain, and combined time-frequency domain, using 4 × 8 dipole array...The transient backscattering mechanisms of a dipole array with reflector have been investigated from different aspects： time-domain, frequency-domain, and combined time-frequency domain, using 4 × 8 dipole arrays with reflector as an example. The data of scattering from the arrays under the incidence of Gaussian pulses are obtained by finite differential time domain method. The influences of the array structural parameters, incident wave parameters, and incident angles on the waveforms, spectrum, and time-frequency representations of the backscattered fields of the arrays are analysed and conclusions are drawn. From these characteristics and conclusions, it is possible to deduce the array structure inversely from the backscattered field.展开更多
该文提出了一种全新的高速连接器时域模型MMTL(Multi-segment Multiple Transmission Line model)。该模型克服了MLC模型不稳定和仿真效率低的缺点,具有直观、精度可控、便于优化等优点。实验结果表明,该文所建模型精度高,与实际测量的...该文提出了一种全新的高速连接器时域模型MMTL(Multi-segment Multiple Transmission Line model)。该模型克服了MLC模型不稳定和仿真效率低的缺点,具有直观、精度可控、便于优化等优点。实验结果表明,该文所建模型精度高,与实际测量的最大误差小。展开更多
文摘Rectangular reflector antennas have motivated the time-domain analysis of electromagnetic scattering problems. The asymptotic time domain physical-optics (TDPO) is applied to the analysis of a rectangular reflector illuminated by a Gaussian-impulse. The effects of time-delayed mutual coupling between points on the surface will be ignored as a result of utilizing the TDPO method for determining the equivalent surface-current density on the reflector. Finally, in this work the scattered signals at the specular reflection point, at the edges, and at the corners can be clearly distinguished.
文摘随着现代社会对电力系统稳定性和效率的要求日益提高,光纤通信技术在远程电力监控系统中的应用变得尤为关键。文章从光纤通信的基本原理出发,对比分析光纤与传统电缆的优势,并详细分析光纤在数据传输高效性、实时监控和故障检测等方面的应用。此外,深入讨论光纤监控系统中远程光纤测试系统(Remote Fiber Test System,RFTS)、光时域反射仪(Optical Time Domain Reflectometer,OTDR)以及地理信息系统(Geographical Information System,GIS)等关键组件的作用和功能。文章全面概述光纤通信在远程电力监控系统中的应用,强调光纤通信技术对于提高电力系统运行效率和可靠性的重要性。
基金Project supported by the Foundations of Beijing Jiaotong Universitythe Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry
文摘The transient backscattering mechanisms of a dipole array with reflector have been investigated from different aspects： time-domain, frequency-domain, and combined time-frequency domain, using 4 × 8 dipole arrays with reflector as an example. The data of scattering from the arrays under the incidence of Gaussian pulses are obtained by finite differential time domain method. The influences of the array structural parameters, incident wave parameters, and incident angles on the waveforms, spectrum, and time-frequency representations of the backscattered fields of the arrays are analysed and conclusions are drawn. From these characteristics and conclusions, it is possible to deduce the array structure inversely from the backscattered field.
