VIAVI Solutions has introduced the µPNT GDO-1000, a GNSS-disciplined oscillator in a compact M.2 B-key form factor. At just 22 mm x 42 mm roughly the size of a postage stamp and weighing under 4 grams, the module is built for platforms where space and power are at a premium.
It targets use cases ranging from defense and airborne systems to unmanned platforms, data center cards, and communications equipment.
As GNSS interference becomes a persistent operational challenge, dual-frequency L1/L5 capability is increasingly seen as a baseline requirement across defense and critical infrastructure deployments.
At the same time, demand is rising for compact, low-power timing solutions, particularly as payload constraints tighten for warfighters and unmanned systems, and as chip-scale atomic clocks (CSACs) face cost and supply pressures.
The µPNT GDO-1000 is designed to address these constraints with a tightly integrated feature set:
- Dual-frequency L1/L5 GNSS reception combined with microsecond-level 24-hour holdover, ensuring reliable timing even in degraded or denied environments
- A standard M.2 B-key form factor that integrates directly into modern compute platforms and embedded systems without custom mechanical work, while consuming roughly 0.5 W
- AI and machine learning algorithms from the Jackson Labs team (now part of VIAVI) that actively predict and correct oscillator behavior under varying environmental conditions
- A MEMS-based oscillator that delivers stronger thermal stability across the full military temperature range than traditional OCXOs, while maintaining phase noise and Allan deviation performance under shock and vibration
- Support for external 1PPS inputs, enabling discipline from M-Code GPS, alternative PNT sources, or other references without hardware changes
- Multiple 1PPS and low phase noise 10 MHz coaxial I/Os, offering flexibility for system-level integration despite the device’s small footprint
Leadership Comment
“Until now, customers needing reliable timing in compact systems have had to choose between two suboptimal options. CSACs are expensive and supply-constrained. Full-size OCXO-based timing solutions are too large and power-hungry for many modern platforms,” said Doug Russell, Senior Vice President and General Manager, Aerospace & Defense, VIAVI Solutions. “The GDO-1000 offers a new path that doesn’t force customers to compromise. Its holdover performance approaches what customers expect from atomic-class clocks, in a module that fits on a standard M.2 slot and draws approximately half a watt.”
The GDO-1000 will be on display at VIAVI Booth 407 at the 2026 Joint Navigation Conference from June 1-4 at the Northern Kentucky Convention Center. As part of the event technical program, Lisa Perdue and Nino De Falcis of VIAVI will speak about a New Cesium-Less ePRTC Solution to Provide Timing for Homeland Critical Infrastructure.
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