SXT-D GNSS Disciplined Oscillator Plus

The SXT-D GNSS Disciplined Oscillator Plus (GNSSDO+) is our highest-performance timing and frequency reference designed for engineers, researchers, and organizations that demand exceptional frequency stability, holdover performance, and traceable time. Built around the Septentrio mosaic-T module and a Rakon STP3593LF Double-Oven OCXO, it delivers industry-leading timing performance out of the box and achieves incredible accuracy when paired with a Fugro AtomiChron® subscription.

With an Allan Deviation of 4×10⁻¹⁵ 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-D GNSSDO+ Provides:

• High-precision GNSS timing (no subscription required)
  Multi-frequency GPS, GLONASS, Galileo, and BeiDou timing with <5 ns time-pulse precision and exceptional resilience against jamming and spoofing through Septentrio AIM+ technology.
• Ultra-stable 10 MHz frequency output The onboard Rakon STP3593LF Double-Oven OCXO provides exceptional frequency stability, temperature performance, and holdover capability, making it ideal for demanding laboratory, telecom, and scientific applications.
• Superior holdover performance
  When GNSS signals become unavailable, the Double-Oven OCXO maintains highly stable frequency output, minimizing drift and preserving synchronization for extended periods.
• 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, Ethernet connectivity, USB-to-Ethernet capability, logging, display control, and remote configuration without requiring a separate host system.
• Flexible power and deploymentUSB-C, Power-over-Ethernet (PoE), or external DC power options plus a rugged aluminum enclosure make the GNSSDO+ suitable for laboratories, telecommunications facilities, 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 SXT-D GNSSDO+ to achieve <1 ns timing accuracy for quantum systems, metrology, advanced networks, and financial timestamping applications.
• Frequency stability approaching hydrogen masers
  The combination of AtomiChron corrections and the SXT-D GNSSDO+'s Double-Oven OCXO provides frequency stability approaching hydrogen maser performance without the cost, power consumption, or maintenance requirements.
• Authenticated, spoof-resistant timing
  Corrections include Navigation Message Authentication (NMA), helping protect against non-genuine GNSS signals and timing attacks in critical infrastructure environments.
• No Internet dependency
  All corrections are delivered via encrypted L-band broadcast, allowing even air-gapped systems to achieve top-of-the-line timing accuracy.
• Global coverage and reliability
  A worldwide network of ground stations and multi-continental service availability ensures highly reliable correction delivery and traceable timing performance.

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.