Automatic retrieval of Satellite orbits

[mike-ivs]

This will need to be done automatically, and may have a delay in their upload that requires reprocessing when new orbits available.

[mike-ivs]

See https://github.com/UoA-eResearch/SPOC-live-flight/issues/4 for possible lead.

[mike-ivs]

For the orbit SP3 files, I manually download from IGS server:

https://cddis.nasa.gov/archive/gnss/products/

More information can be found from IGS website:

https://igs.org/products-access/#gps-orbits-clocks

[mike-ivs]

https://urs.earthdata.nasa.gov/documentation/for_users/data_access/python

https://github.com/GNSSpy-Project/gnsspy/blob/master/gnsspy/download.py

[mike-ivs]

Done