7-Day Starlink Performance Characterization in Athens, Greece (NEXASPHERE Project)

This dataset contains a 7-day network performance characterization of a Starlink Low Earth Orbit (LEO) satellite internet connection conducted in Athens, Greece. The measurements were performed for a week (11 - 18 May 2026), as part of the NEXASPHERE project (Horizon Europe, Grant Agreement No: 101192912). The primary objective of this dataset collection was to profile the baseline stability, potential network disruptions and throughput/latency fluctuations of the Starlink LEO satellite constellation in a realistic urban operational environment. This empirical dataset serves as a foundation for the calibration and validation of network simulation tools developed within the NEXASPHERE project. Location & Setup: City: Marousi, Athens, Greece (Lat: 38.049991, Lon: 23.788260) Deployment: Fixed rooftop installation with a 100% clear view of the sky (zero obstruction fraction) Network: Starlink (commercial service) satellite connection (Gen2/Rev4, rev4_catapult_proto1). Methodology & Tools: Timeframe: 7 consecutive days between 11 May 2026 (12:06 UTC) and 18 May 2026 (12:07 UTC) The measurements were collected in an automated way (using python scripts) via a Linux-based edge device (HP Compaq 8510w) connected to the Starlink terminal via Ethernet Latency & Jitter: 20 ICMP pings (20 per cycle) to Cloudflare (1.1.1.1) and Google (8.8.8.8) every 60 seconds Throughput (Downlink/Uplink): Measured every 5 minutes using multi-stream Ookla Speedtest-cli (multi-stream bursts capacity tests) and iperf3 (single-stream TCP to own public server) Antenna Telemetry: Real-time performance metrics (PoP ping, state, SNR, throughput) retrieved directly from the Starlink dish gRPC API once per minute Data Security & Handling: During the active collection phase, data was stored in OTE’s R&D ICT Cloud infrastructure, protected by a multi-layered security stack including VPN access, firewalls and HTTPS/TLS encryption. The dataset comprises a total of 8,857 latency cycles and 1,772 throughput cycles. Key Findings: Latency (RTT): Min: ~17 ms, Mean: ~27 ms, Max: ~120 ms, P95: below 41 ms Download/Upload Throughput (Speedtest): Peak ~429/77 Mbps with an average of 217/46 Mbps Jitter: Min: ~0.9 ms, Mean: ~7.8 ms, Max: ~78 ms Connectivity/Dish Availability: 100% connectivity availability over the 168-hour window. Dataset Structure: The data is provided in both .csv (tabular) and .json (structured) formats: all_metrics.csv/json: Consolidated dataset including all synchronized data samples latency.csv/json: High-resolution RTT statistics (min, mean, max, mdev) throughput_Down/Up.csv/json: Detailed iperf3 and Speedtest results antenna_metrics.csv/json: Internal telemetry from the Starlink gRPC interface metadata.json: Technical context (firmware versions, hardware models, IP configurations) measurements_summary.json: Aggregated statistical distribution (P50, P95, P99).