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LEO satellite delay and Doppler simulation and adjusted NR_UE time sync

Thomas Schlichter requested to merge ntn_leo_time_comp into develop
  • Added rfsim channel models SAT_LEO_TRANS and SAT_LEO_REGEN to simulate time-variant delay and Doppler for circular satellite orbit. Delay and Doppler computation is done as in Matlab function dopplerShiftCircularOrbit: https://de.mathworks.com/help/satcom/ref/dopplershiftcircularorbit.html
  • Improved NR_UE time sync by adding PI comtroller
  • Added Rel17 NTN parameter ta_CommonDrift_r17 and use it as initial value to compensate time drift starting during initial sync
  • Add autonomous TA update to NR_UE based on the measured DL drift to keep UL sync (this needs to be replaced by standard compliant algorithm once SIB19 is implemented with continuously updated contents)

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