SXT GNSS Disciplined Oscillator

The SXT GNSS Disciplined Oscillator (GNSSDO) is a high-performance, multi-constellation timing receiver and frequency reference designed for engineers, researchers, and organizations that rely on extremely stable, traceable time. Built around the Septentrio mosaic-T module and the SiTime SiT5358 Super-TCXO, it provides robust timing performance without additional services — and unlocks incredible accuracy when paired with a Fugro AtomiChron® subscription.

With an Allan Deviation of 7×10⁻¹⁵ over 20000 seconds, the SXT GNSSDO is a high-powered, economical choice for your next timing project, whether you're researching quantum systems, securing financial infrastructure, or synchronizing networks.

Out of the box, the SXT GNSSDO provides:

• High-precision GNSS timing (no subscription required)
  Multi-frequency and multi-constellation timing with <5 ns time-pulse precision and strong resilience against jamming and spoofing.
• Ultra-stable 10 MHz frequency output
  The onboard SiT5358 Super-TCXO delivers ±50 ppb stability with excellent aging and temperature performance; ideal for labs, networks, and embedded systems.
• Event timestamping <20 ns
  Capture, log, and correlate time-critical events with exceptional precision using the dedicated SMA event input.
• Built-in control and remote access
  An integrated ESP32-WROVER provides a web console, USB-to-Ethernet capability, logging, and configuration without needing a separate microcontroller or host.
• Flexible power and deployment
  USB-C, PoE, or barrel-jack power options plus a sturdy aluminum enclosure make it suitable for labs, server rooms, and field installations.

What You Unlock with AtomiChron®:

A Fugro AtomiChron® subscription transforms the GNSSDO into a reference-grade timing source previously accessible only through cesium clocks or hydrogen masers.

• Sub-nanosecond accuracy (<1 ns)
  AtomiChron® delivers timing corrections over encrypted L-band, allowing the GNSSDO to achieve <1 ns timing accuracy — suitable for quantum systems, metrology, advanced networks, and financial timestamping requirements.
• Frequency stability approaching hydrogen masers
  AtomiChron® provides stability levels that surpass high-caliber industrial cesium clocks and approach hydrogen maser performance without the cost, power, or maintenance.
• Authenticated, spoof-resistant timing
  Corrections include Navigation Message Authentication (NMA), offering protection against non-genuine GNSS signals, a must for financial, security, and telecom applications.
• No internet dependency
  All corrections are delivered over encrypted L-band broadcast. Even air-gapped systems can achieve top-of-the-line timing accuracy.
• Global coverage and reliability
  A worldwide network of ground stations and multi-continental availability ensures highly reliable correction delivery and traceability.

Please Note: The mosaic-T firmware (4.14.4) supports RTCM input for RTK Rover positioning. However, RTCM output is not supported. You cannot use the mosaic-T as an RTK Base. The documentation suggests you can, but you cannot.