I want to find and see "GPS satellites in view" for different orbits missions. For example I want to see the observable GPS satellites for a specific satellite in GEO, for this purpose I need a software which can visualize and make a 3D model of about 33 satellites together(32 GPS satellites and one in GEO) arounding the earth for me. Do you know any special software? I use windows 8.(I couldn't use SaVi because of operating system)
Maybe Systems Tool Kit could be helpful:
It's a powerful tool, and there is also the possibility to have a free license, although it does not include all capabilities. I have used it on Windows 10, but I cannot tell about Windows 8.
SaVi runs under Windows. It can be run under the Windows Linux Subsystem, under Cygwin, or under VirtualBox. And how to get it running is fully documented.
And SaVi includes GPS and GNSS simulations.