摘要
本文提出一种根据多站雷电定位资料确定闪电定位系统(LLS)场地误差的方法。该方法假定场地误差具有有限阶三角级数的形式,由雷电方位的多站实测资料,经Orville的本征值技术处理,将问题化为一个非线性无约束极值问题,从而可由对目标函数求极值点来确定场地误差。文中利用1988年夏天在北京地区由三个雷电方位探测器(DF)记录到的4900个实际雷电资料求得了各DF站的场地误差曲线。95％以上的闪电经误差订正后的方位与实测方位的残余偏差在±1°以内,与雷达回波的一致性也有了明显改进。
In this paper, a parameterization method of the site errors estimation in lightning locating system (LLS), using the data of multi-direction finders (DFs), has been developed. According to the method, the site errors for each DF are assumed to be a function of measured bearing and are expressed as limited-terms sinusoidal function. From Orville' s eigen technique and non-linear unconstrained minimization problem, the site errors are directly found by minimizing the objective function.
Utilizing the real data of some 4900 lightning flash samples observed by LLS of three DFs in Beijing region in the summer of 1988, the site error correction curves for all DFs were found. The results show that the residual errors more than 95 percentage of the flash between the corrected and real flash directions are less than 1 ° after correcting. In addition, the lightning locations with the correcting are more consistent with the radar echo than those without the correcting.
出处
《高原气象》
CSCD
北大核心
1990年第3期307-319,共13页
Plateau Meteorology
基金
"七五"攻关资助项目
关键词
雷电
定位
场地
误差
参数化法
Lightning locating
Site error
Random error
Correcting
