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昆明地区连绵起伏山体对地闪回击定位精度影响的模拟研究
引用本文:吉德志,张运龙,王磊,张金波,戴炳哲.昆明地区连绵起伏山体对地闪回击定位精度影响的模拟研究[J].电波科学学报,2021,36(2):179-186,312.
作者姓名:吉德志  张运龙  王磊  张金波  戴炳哲
作者单位:1.云南电网有限责任公司昆明供电局,昆明 650011
摘    要:为了探讨真实地形对雷电定位精度的影响,利用二维时域有限差分(two-dimensional finite-difference time-domain,2D FDTD)算法,采取共形网格剖分技术,通过与平坦地面相比,首先研究了云南昆明地区复杂地形地貌对雷电电磁场传播的影响,然后利用时差定位算法,进一步探讨了该地区复杂地...

关 键 词:山体  雷电电磁场  辐射场强度  信号到达  时差定位
收稿时间:2020-01-10

Simulation study on the impact of rolling hills in Kunming area on the accuracy of cloud-to-ground return stroke location
JI Dezhi,ZHANG Yunlong,WANG Lei,ZHANG Jinbo,DAI Bingzhe.Simulation study on the impact of rolling hills in Kunming area on the accuracy of cloud-to-ground return stroke location[J].Chinese Journal of Radio Science,2021,36(2):179-186,312.
Authors:JI Dezhi  ZHANG Yunlong  WANG Lei  ZHANG Jinbo  DAI Bingzhe
Abstract:In this paper, two-dimensional finite-difference time-domain algorithm (2D FDTD) and conformal meshing technology are adopted. By comparing with the flat ground, the influence of complex topography and geomorphology on the electromagnetic field propagation in Kunming, Yunnan is firstly studied. Then we further analyze the possible influence of the complex topography of the area on the accuracy of lightning location by time of arrival (TOA) method. The results shows that: 1) Due to the preferential attenuation of high-frequency lightning signals by the complex mountains, the larger the mountain on the propagation path, the longer the wave risetime of the corresponding lightning electromagnetic field, that is, the signal arrival time may be delayed. For the selected area of Kunming, it can be seen that the delay time of the peak value of the pulse waveform is distributed within 4–5 μs. 2) According to the different definitions of the pulse signal arrival time, for the flat ground or the real surface considering complex terrain, the 10% peak arrival method has smaller delay time. According to the lightning location technique by TOA method, when the ground is flat, the positioning result of the 10% peak method basically coincides with the assumed lightning strike position. For the complex real ground, the positioning error of the 10% peak method is basically about 2000 m and the location errors are different for different propagation paths.
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