I’m currently trying to use the new functionalities of Orekit 10. I have a GNSS simulator but it’s on Orekit 7 and had to implement each constellation individually which wasn’t the most elegant way of doing so. I would like now to use the new interfaces definitions to try and make my life easier with handling the GNSS constellations.
But I’m not too familiar with the use of interfaces and how I should use them or specify the required inputs.
I’m doing a link budget assessment, assessing what C/N0 my GNSS receiver would get. I would like to first do the exact same but taking advantage of the new functionalities of Orekit and then extend it to range and phase measurements.
What would be your suggestion to setup all GNSS constellations? Is there YUMA files available for all of them?
I don’t think official YUMA files are available for all constellations.YUMA files are available for GPS satellites on celestrak website. QZSS almanacs are also available using YUMA files (here). However, for the other constellations, other format are used. For instance, the European GNSS Agency (GSA) provides Galileo almanacs using .xml files (here).
The common format used to setup all GNSS constellations is the RINEX navigation files. There is an open issue (#523) on Orekit to add support for this format.