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I'm trying to calculate elevation and azimuth angles of a satellite for a ground GPS receiver. I downloaded the SP3 file for the day '12-01-2015'. The ephemeris files are in the link below.

https://drive.google.com/drive/folders/1g0dMCTDHwfuKI5x-I4mh97c7pTvDgMPF?usp=sharing

The ground station location is lat_receiver= 37.0;%degree, lon_receiver= 35.34;%degree.

Are SP3 ephemeris files format ECEF? How can I found the elevation and azimuth angles for that station for all 32 GPS satellite? I need to find the satellittes and times with an elevation greater than 40 degrees?

I am trying to write this code in Matlab.

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  • $\begingroup$ Consider searching the site for similiar questions. $\endgroup$
    – Organic Marble
    Commented Aug 21, 2023 at 11:56

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You need to use the navigation file to find the ECEF coordinates of the satellites and then use SP3 files to form the precise orbits, after than you can convert ECEF to ENU and use formula in the following page: https://gssc.esa.int/navipedia/index.php/Transformations_between_ECEF_and_ENU_coordinates

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