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  • Electronics and Electrical Engineering  (3)
  • Geosciences (General)  (1)
  • 1
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    Retrieving Storm Electric Fields from Aircraft Field Mill Data (2006)
    In:  Other Sources
    Details
    Publication Date: 2018-06-12
    Description: It is shown that the problem of retrieving storm electric fields from an aircraft instrumented with several electric field mill sensors can be expressed in terms of a standard Lagrange multiplier optimization problem. The method naturally removes aircraft charge from the retrieval process without having to use a high voltage stinger and linearly combined mill data values. It allows a variety of user-supplied physical constraints (the so-called side constraints in the theory of Lagrange multipliers) and also helps improve absolute calibration. Additionally, this paper introduces an alternate way of performing the absolute calibration of an aircraft that has some benefits over conventional analyses. It is accomplished by using the time derivatives of mill and pitch data for a pitch down maneuver performed at high (greater than 1 km) altitude. In Part II of this study, the above methods are tested and then applied to complete a full calibration of a Citation aircraft.
    Keywords: Electronics and Electrical Engineering
    Type: Journal of Atmospheric and Oceanic Technology; Volume 23; 1290-1291
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Retrieving Storm Electric Fields From Aircraft Field Mill Data. Part I: Theory (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: It is shown that the problem of retrieving storm electric fields from an aircraft instrumented with several electric field mill sensors can be expressed in terms of a standard Lagrange multiplier optimization problem. The method naturally removes aircraft charge from the retrieval process without having to use a high voltage stinger and linearly combined mill data values. It also allows a variety of user-supplied physical constraints (the so-called side constraints in the theory of Lagrange multipliers). Additionally, this paper introduces a novel way of performing the absolute calibration of an aircraft that has several benefits over conventional analyses. In the new approach, absolute calibration is completed by inspecting the time derivatives of mill and pitch data for a pitch down maneuver performed at high (greater than 1 km) altitude. In Part II of this study, the above methods are tested and then applied to complete a full calibration of a Citation aircraft.
    Keywords: Electronics and Electrical Engineering
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    General Matrix Inversion Technique for the Calibration of Electric Field Sensor Arrays on Aircraft Platforms (2007)
    In:  Other Sources
    Details
    Publication Date: 2018-06-12
    Description: A matrix calibration procedure has been developed that uniquely relates the electric fields measured at the aircraft with the external vector electric field and net aircraft charge. The calibration method can be generalized to any reasonable combination of electric field measurements and aircraft. A calibration matrix is determined for each aircraft that represents the individual instrument responses to the external electric field. The aircraft geometry and configuration of field mills (FMs) uniquely define the matrix. The matrix can then be inverted to determine the external electric field and net aircraft charge from the FM outputs. A distinct advantage of the method is that if one or more FMs need to be eliminated or deemphasized [e.g., due to a malfunction), it is a simple matter to reinvert the matrix without the malfunctioning FMs. To demonstrate the calibration technique, data are presented from several aircraft programs (ER-2, DC-8, Altus, and Citation).
    Keywords: Electronics and Electrical Engineering
    Type: Journal of Atmospheric and Oceanic Technology; Volume 24; Issue 9; 1576-1587
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Applications of GLM Data for National Climate Assessment (NCA) Studies (2019)
    In:  CASI
    Details
    Publication Date: 2019-12-17
    Description: The Geostationary Lightning Mapper (GLM) offers a new and exciting way to probe lightning/climate inter-relationships, and therefore supports the National Climate Assessment (NCA) program. In particular, there is a desire to use GLM to estimate lightning nitrogen oxides (LNOx) since trace quantities of NOx affect greenhouse gas concentrations (e.g., ozone).
    Keywords: Geosciences (General)
    Type: MSFC-E-DAA-TN75261 , Paper# AE11A-3181 , Fall AGU Meeting; Dec 09, 2019 - Dec 13, 2019; San Francisco, CA; United States
    Format: application/pdf
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