How to find GNSS satellite elevation angle from .obs and .nav data?

Trying to find GNSS/ NavIC satellite elevation angle from obs and nav data

Answer 1

[Aravind]

Hi @SOMNATH MAHATO,

It sounds like you're looking to calculate the satellite elevation angle from a .NAV RINEX file. Here's how you can do it:

1. Use the “rinexread” function to read the navigation data from the ".NAV" file and store it in a structure. You can find detailed information about the “rinexread” function here: https://www.mathworks.com/help/releases/R2024a/nav/ref/rinexread.html.
2. With this data, you can determine the position of the satellites in the Earth-centered Earth-fixed (ECEF) coordinate system using the “gnssconstellation” function from the Navigation Toolbox. More details about the “gnssconstellation” function are available at: https://www.mathworks.com/help/releases/R2024a/nav/ref/gnssconstellation.html.
3. Once you have calculated the satellite positions, you can obtain the elevation and azimuth angles of the satellites using the “lookangles” function, provided you know the position of the receiver. For more information on this function, visit: https://www.mathworks.com/help/releases/R2024a/nav/ref/lookangles.html.

By following these steps, you should be able to calculate the satellite elevation angle from the ".NAV" file.

Hope this helps!