Research Data

Research data: time transfer, laboratories and Internet measurements

ntpstats reads the data behind recent time-transfer and NTP measurement studies directly:

Format	Where it comes from	What you get
cggtts	GNSS time-transfer receivers at time laboratories (BIPM CGGTTS V2E)	REF − GNSS time per epoch; ntpstats cv gives UTC(A) − UTC(B)
rinex-clock	IGS clock products (.clk, gzip accepted)	receiver and satellite clock biases
circular-t	BIPM Circular T, section 1	UTC − UTC(k) for about 80 laboratories
ripe-atlas	RIPE Atlas NTP measurements (API JSON)	offset and RTT per probe and server
ntppool	NTP Pool monitoring logs	offset, RTT and score per monitor
interop	the ntpstats open dataset (data/interop/, monthly since 2026)	NTP/NTS/NTPv5/Roughtime probes of public servers, with availability

All are auto-detected and work with every command: info, stability, noise, hat and report.

Stability of UTC(k) from Circular T

Circular T gives UTC − UTC(k) every five days. Concatenate the issues you have into one file:

curl -O https://webtai.bipm.org/ftp/pub/tai/Circular-T/cirt/cirt.44[0-9]
cat cirt.4* > cirt-all.txt
ntpstats info cirt-all.txt --all-peers                   # one series per laboratory
ntpstats stability cirt-all.txt --peer PTB -k tdev,htot  # stability of UTC(PTB)

The published uncertainties (uA, uB, u) are kept in each series' metadata.

GNSS common view between two laboratories

ntpstats cv laba.cggtts labb.cggtts -o ab.csv           # REF(A) - REF(B), common view
ntpstats cv laba.cggtts labb.cggtts --mode aiv -o ab.csv # all in view
ntpstats stability ab.csv -k tdev,mdev

• Common view differences the same satellite at the same epoch, so satellite clock errors cancel.
• All in view differences the per-epoch means.
• Line checksums of each file are verified; failing lines are skipped and counted.

Clock products (IGS)

ntpstats stability IGS0OPSFIN_20250190000_01D_05M_CLK.CLK.gz --peer PTBB -k oadev,hdev

NTP servers seen from many vantage points (RIPE Atlas)

curl "https://atlas.ripe.net/api/v2/measurements/MSM_ID/results/?format=json&start=...&stop=..." -o atlas.json
ntpstats info atlas.json --all-peers

In Python, ntpstats.research.group_summary(series, by="peer") gives the offset distribution per server (median, 95th percentile of |offset|) across all probes, or by="probe" per vantage point. Atlas logs local − server; ntpstats negates it to its usual server − local.

NTP Pool monitors

curl "https://www.ntppool.org/scores/192.0.2.1/log?limit=2000&monitor=*" -o pool.csv
ntpstats info pool.csv --all-peers        # one series per monitor
ntpstats hat pool.csv --all-peers         # which monitor paths are noisy?

Please keep requests to public services modest.

The ntpstats open interop dataset

Every week the Live interop workflow probes public NTP, NTS, NTS-pool, NTPv5 and Roughtime servers; the first run of each month is recorded in data/interop/. The dataset is versioned with every release (Zenodo), and its schema is in the directory's README.

ntpstats dataset data/interop --test nts      # availability and offsets of NTS servers over time
ntpstats stability data/interop --peer time.google.com -k oadev

A directory given to any command is read as the concatenation of its files.

Synthetic examples of every format are in examples/data/.