The selection is made from the scenario tree under the constellation file. The following example shows this for GPS. Select [GPS constellation-->GPS signal sources file-->Satellite selection]
When there are more satellites visible than your signal generator can simulate, you can choose one of three Selection method algorithms to select the satellites your signal generator will simulate:
Please refer to the SimGEN user manual, DGP00686AAA, for further descriptions and information about the satellite selection control. In addition SOL10131 provides a more detailed definition of what "DOP" is and SOL10137 explains how PosApp determines the simulated power level.