Standards analysis
NR over Non-Terrestrial Networks
NTN versus NR NTN, transparent payload architecture, ECEF satellite tracking, UE- and satellite-centric views, GEO/LEO behavior, timing and Doppler.
Build the NR NTN model →Engineering Foundation
NR NTN & Satellite Radio
What changes when the NR air interface leaves a terrestrial cell: orbit-dependent geometry, long and varying delay, Doppler, moving coverage, autonomous UE compensation and multi-orbit design trade-offs.
Build the NTN timing model
Start with the architecture and satellite state, then follow SIB19 all the way through epoch-based delay prediction, random access and uplink alignment at the synchronization reference point.
Standards-guided numerical analysis
SIB19, Epoch Time and Timing Advance
Transparent payloads, the UL synchronization reference point, current SFN acquisition, future epochs, Common TA, service-link RTT and a complete numerical RACH trace.
Trace the timing numerically →Numerical geometry analysis
LEO Orbits, Beams and Elevation
Why a LEO orbit moves across the sky, how constellations maintain coverage, how spot beams move or steer, and how elevation angle changes range and footprint.
See the satellite geometry →Reproducible experiment
LEO Pass Timing and Doppler Error Analysis
Run a complete 600 km pass and measure how epoch, satellite-state and UE-position errors become residual service-link timing and Doppler errors.
Inspect the experiment →