What is the output coordinate frame from IGRF Block?

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Norawit Nangsue
Norawit Nangsue 2021-4-27
回答： David Coventry 2021-8-2
Dear,
I'm trying to use the IGRF Block from Arerospace Blockset.
The reference is here, Calculate Earth magnetic field and secular variation using 12th generation International Geomagnetic Reference Field - Simulink (mathworks.com)
I'm using trying to use the XYZ output from that block. But my problem is: I'm not sure about the "+ve down" notation as written in the document, is it the same to NED(North East Down) or ENU(East North Up)?
Thank you

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回答（1 个）

David Coventry
David Coventry 2021-8-2
The coordinate frame is local NED at the requested lat,lon,h location.
The source paper can be used as a reference:
https://earth-planets-space.springeropen.com/articles/10.1186/s40623-015-0228-9
"The geocentric components of the geomagnetic field in the northward, eastward, and radially inwards directions (X, Y and Z) are obtained from the model coefficients using Equation 1 and by taking the gradient of V in spherical polar co-ordinates"
Also, please take a look at the new IGRF block which has the updated IGRF-13 data:
https://www.mathworks.com/help/aeroblks/internationalgeomagneticreferencefield.html
David

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