摘要
利用场地误差优化模式对深圳地区的地闪定位资料进行优化处理。首先对深圳市闪电定位系统进行简单介绍,然后利用改进的传输线模式对真实地表环境下的闪电辐射电磁场进行计算,以分析深圳市闪电定位系统的场地误差,最后基于定位误差和场地误差模式对闪电定位数据进行定位误差订正。结果表明不同方位角上的不规则地形对继后回击电磁场波形具有不同影响,随着表征地形粗糙程度的高度均方根的增加,电场的峰值下降,波形的上升沿时间增加。同时,电场波形上升沿时间也会随着方位角的变化而变化,这可能会给时间到达法的定位带来一定误差。为了验证该算法的合理性,对该系统覆盖的区域进行了闪电定位数据优化精度的时空分布分析和评估。结果表明这种优化方案是可行的、可靠的,优化后的闪电定位精度明显提高。
Based on the site error optimization model, the lightning flash data in Shenzhen are analyzed and corrected. The lightning location system of Shenzhen is introduced, and the site errors of the lightning location system are analyzed, the lightning-radiated electromagnetic field are calculated and analyzed with the improved transmission line model under real surface environment. Based on the site errors and site error model, the lightning flash data in Shenzhen are corrected. The results show that the irregular terrains with different azimuths have different effects on the electromagnetic waves of subsequent strokes. With the increasing root mean square of the height of irregular terrain, the peak value of electric field reduces and the waveform rise-time increases. Meanwhile, the rise-time of electric field waveform varies with the changes in azimuth, which may bring some errors in using the TOA （time of arrival） location method. To verify the reasonableness of the site error model, the optimization accuracy in the covered area of the lightning location system is also calculated and analyzed. It is found that this optimization method is feasible and reliable, and the location accuracy of the optimized lightning scheme is significantly improved.
出处
《气象科技》
北大核心
2015年第3期530-536,542,共8页
Meteorological Science and Technology
基金
中国气象局华南区域气象中心科技攻关项目(GRMC2012M17)
成都信息工程大学科研基金(KYTZ201413
CRF201401)共同资助
关键词
闪电定位系统
场地误差
误差分析
lightning location system
site error
error analysis
