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North Alabama Lightning Mapping Array (LMA): VHF Source Retrieval Algorithm and Error AnalysesTwo approaches are used to characterize how accurately the North Alabama Lightning Mapping Array (LMA) is able to locate lightning VHF sources in space and in time. The first method uses a Monte Carlo computer simulation to estimate source retrieval errors. The simulation applies a VHF source retrieval algorithm that was recently developed at the NASA Marshall Space Flight Center (MSFC) and that is similar, but not identical to, the standard New Mexico Tech retrieval algorithm. The second method uses a purely theoretical technique (i.e., chi-squared Curvature Matrix Theory) to estimate retrieval errors. Both methods assume that the LMA system has an overall rms timing error of 50 ns, but all other possible errors (e.g., multiple sources per retrieval attempt) are neglected. The detailed spatial distributions of retrieval errors are provided. Given that the two methods are completely independent of one another, it is shown that they provide remarkably similar results. However, for many source locations, the Curvature Matrix Theory produces larger altitude error estimates than the (more realistic) Monte Carlo simulation.
Document ID
20030066898
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Koshak, W. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Solakiewicz, R. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Blakeslee, R. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Goodman, S. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Christian, H. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hall, J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Bailey, J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Krider, E. P.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Bateman, M. G.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Boccippio, D.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Numerical Analysis
Distribution Limits
Public
Copyright
Other

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