How to calculate semiMajorAxis and trueAnomaly from TLE file

Question

Raghav Rathi 2024-7-25，18:39

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https://ww2.mathworks.cn/matlabcentral/answers/2140276-how-to-calculate-semimajoraxis-and-trueanomaly-from-tle-file

评论： Raghav Rathi about 21 hours 前

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Hi,

I am trying to add satelltie to satellite scenario by following the documentaion.

The general way is to simply use the TLE file

sat1 = satellite(sc,tleFile,"Name","Sat1")

If I want to find the Keplerian elements the function orbitalElements(sat1) can give eccentricity, inclination, rightAscensionOfAscendingNode and argumentOfPeriapsis. But how does MATLAB computes semiMajorAxis and trueAnomaly?

Any help is appreicated.

Thank you

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Answer 1

Sam Chak 2024-7-25，20:51

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https://ww2.mathworks.cn/matlabcentral/answers/2140276-how-to-calculate-semimajoraxis-and-trueanomaly-from-tle-file#answer_1490751

编辑：Sam Chak 2024-7-25，20:57

Hi @Raghav Rathi

Use the tleread() command.

Otherwise, you can also manually extract the info as detailed here:

https://www.mathworks.com/help/aerotbx/ug/satelliteScenario-key-concepts.html#mw_e08739b4-c5da-4983-898b-56e18cc71f87

After that, apply the equations that you learned in Orbital Mechanics to determine the Semi-major axis.

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Raghav Rathi about 21 hours 前

Hi @Sam Chak

Thanks for your reply, but tleread() is pretty much the same as orbitalElements() in terms of output.

When you create a satelliteScenario() using a TLE file, it also generates the orbit of the satellite.

For instance below is an example created using TLE file.

Since it can create the orbit of the satellite, I was wondering if there was a way to get the information about the semi major axis through a matlab function, as most of the information that is needed for the calculation is present.

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