Thank you very much @luc for this complete answer !
I understand now how to use the object AngularAzEl. And you’re right, for my problem the usage of an unknown satellite seems to be the best way.
I’m just affraid of the performances of my computation because I have to keep useless informations in memory (Groundstation, Satellite, Offset and Baseweight) for each point.
I just implemented a small Class radarMeasurements with the values I need (date, az, el, range, rangeRate and possibly radar when I will work with different radars).
Maybe I will use a sub-Class of Measurements as @MaximeJ proposed when I will work on a more complex solution (multi-satellite, multi-radar).
Thank you again for your help !
ps : I asked a question on another subject about the conversion pvcoordinates => az, el, range for simulations and the opposite operation az, el, range => Vector3D with which I have some troubles with the reference Frame (X and Y are inversed)
If you have any idea I’ll be happy to exchange with you about this topic also.