3GPP Rel-17 NTN & Satellite Telecommunications Audit

NTN / SATCOM3GPP Rel-17SDR Ready

Overview & Audit Objective

3GPP Release 17 introduces Non-Terrestrial Networks (NTN) to integrate satellite constellations (LEO, MEO, GEO) directly with 5G NR User Equipment and IoT devices. This playbook guides operators through tracking LEO satellite orbits, calculating dynamic Doppler frequency offsets, capturing L-band/S-band satellite bursts (Iridium / Inmarsat / 5G NTN), and decoding telemetry with gr-satellites.

Execution Steps

1
Inspect Satellite Tooling & Constellations:
Display available satellite demodulators, center frequencies, and orbit profiles:
Terminal — NTN Status Check
```
telcosec ntn status
```
2
Calculate LEO Orbital Doppler Shift:
Compute carrier frequency shifts and receiver search bands for satellite passes:
Terminal — Calculate Doppler
```
telcosec ntn doppler leo
```
3
Receive & Demodulate Satellite Signals with SDR:
Capture L-band satellite downlink signals using SDR hardware (USRP / HackRF / LimeSDR) and gr-satellites:
Terminal — Demodulate with gr-satellites
```
conda activate telcosec-sdr
gr_satellites --hexfmt --demod BPSK --rate 250000 /tmp/satellite_iq.raw
```
4
Parse Satellite Packets & SBD Telemetry:
Extract burst data packets and parse mobile messaging streams using the Iridium Toolkit:
Terminal — Parse Satellite Bursts
```
sudo ntn-sat-install
iridium-parser -i /tmp/satellite_bursts.bits -o /tmp/iridium-frames.pcap
```

Evidence & Artifact Archiving

Archive satellite IQ captures and parsed frame PCAPs into a timestamped evidence archive:

Terminal — Bundle Evidence

telcosec bundle-evidence satellite-ntn-audit