Location accuracy evaluation of ToA-based lightning location systems over mountainous terrain

Li, Dongshuai (Climate Dynamics Research Center and Earth System Modeling Center, Nanjing University of Information Science and Technology, Nanjing, China) ; Rubinstein, Marcos (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Rachidi, Farhad (3Electromagnetic Compatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Rachidi, Farhad (Electromagnetic Compatibility Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Diendorfer, Gerhard (OVE Service GmbH, Department ALDIS (Austrian Lightning Detection and Information System), Vienna, Austria) ; Schulz, Wolfgang (Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China) ; Lu, Gaopeng (Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China)

In this paper, we analyze the location error of time of arrival (ToA)-based lightning location systems (LLSs) caused by propagation effects over mountainous terrain around the Säntis tower located in the Swiss Alps. The study is based on a full-wave three-dimensional (3-D) finite difference time domain approach using the topographic map including the Säntis tower and the nearby sensors belonging to LLSs. It is found that the vertical electric fields are strongly affected by the presence of the mountainous terrain and the finite ground conductivity and that the location error associated with the ToA technique depends strongly on the used onset time estimation technique. The evaluated location errors associated with amplitude thresholds of 10% and 20% and the time of the linear extrapolation of the tangent at maximum field derivative are found to be smallest (about 300mor less). Finally, we assess the accuracy of two simplified methods (terrain envelope method and tight-terrain-fit method) to account for the location error due to propagation over mountainous terrain. These two methods might represent an efficient alternative to estimate the additional time delay due to propagation over a nonflat terrain by using available topographic data. In addition, a possible real-time location error compensation algorithm using the elongated propagation path method to improve the location error of the LLSs in mountainous regions is presented and discussed.


Type d'article:
scientifique
Faculté:
Ingénierie et Architecture
Ecole:
HEIG-VD
Institut:
IICT - Institut des Technologies de l'Information et de la Communication
Classification:
Ingénierie
Date:
2017-11
Pagination:
16 p.
Veröffentlicht in:
Journal of Geophysical Research: Atmospheres
Numérotation (vol. no.):
2017, vol. 122, pp. 11760–11775
DOI:
ISSN:
2169-897X
Le document apparaît dans:



 Datensatz erzeugt am 2021-07-15, letzte Änderung am 2021-07-16

Fulltext:
Volltext herunterladen
PDF

Dieses Dokument bewerten:

Rate this document:
1
2
3
 
(Bisher nicht rezensiert)