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how to go from NED to ECI frame?

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Khang Nguyen
Khang Nguyen on 21 Feb 2021
Answered: Alan Moses on 25 Feb 2021
Hello! I am wondering how do you go from NED frame to ECI frame?
I got a NED frame from the WMM block but it say that the dimention of matrix multiplication is not complete.
also I got an error say that the built in fuction ecef2eci does't exist
function ECI = NEDtoECI(mu, l, NED)
DCM = [-sin(mu)*cos(l) -sin(mu)*sin(l) cos(mu) ; -sin(l) cos(l) 0 ; -cos(mu)*cos(l) -cos(mu)*sin(l) -sin(mu)];
dcmtran = DCM.';
ECEF = NED*dcmtran;
utc = [2019 1 4 12 0 0];
ECI = ecef2eci(utc,ECEF);
end

Answers (1)

Alan Moses
Alan Moses on 25 Feb 2021
Hi Khang,
The “ecef2eci” is part of the set of functions that require the ‘Aerospace Blockset CubeSat Simulation Library’ Add-on support package. You could download this from the Add-ons manager.
Alternatively, you may also check out the function here in the MathWorks File Exchange.
Hope it helps!

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