Hello,
If you want to compute the position vector from a ground location and a time-stamped azimuth+elevation+range measurement, please look here.
The only prerequisite is to create a TopocentricFrame attached to the longitude+latitude+altitude information, represented in Orekit by GeodeticPoint.
Note that the class TrackingCoordinates is only available in version 12.0, but you don’t have to use it to perform these calculations, it’s just a data container.
Best,
Romain