Syntony GNSS and Chronos Technology have s formed a partnership to deliver underground GNSS positioning, navigation and timing (PNT) solutions for critical infrastructure applications in the United Kingdom.

Syntony GNSS is a leader and expert in the design and manufacture of GNSS systems, and Chronos Technology is a resilient GNSS system integrator.

GNSS coverage has become fundamental to many services from emergency services to asset tracking for example. Yet when entering an underground area such as a metro/subway, tunnel, car park, airport, or bus station for example, the GNSS signal is lost.

Syntony’s SubWAVE solution expands the GNSS coverage to underground areas, enabling the localization of any equipment with a standard GNSS chipset. Examples include standard smartphones and the TETRA  Emergency Services Network handset used for security and services. Security and services applications include locating emergency calls, keeping track of staff, locating faults in tunnels, managing assets, locating trains and providing guidance.

A Syntony team member in a Swedish road tunnel during SubWAVE testing shows the positioning in an underground environment on a smartphone. (Photo: Syntony GNSS)

By emitting a perfect emulation of the “real” GNSS signal, SubWAVE offers underground operators, their staff, emergency services and the general public the benefit of full GNSS coverage in all underground areas for both operational and safety reasons.

One fundamental aspect is the user only needs a standard GNSS receiver (a smartphone or TETRA radio) — no new handsets, receivers or apps are required. The system operates by broadcasting synthetic location specific GNSS signals through existing or new leaky feeder cables in the tunnels.

Accuracy levels vary with leaky feeder and system complexity options; however, 2-meter accuracy is possible with a standard smartphone. The system is widely installed in the Stockholm metro and is in active trials throughout Europe and America.

“We are pleased to form a partnership with GNSS specialists Chronos,” said Joel Korsakissok, president of Syntony GNSS. “Their knowledge and experience, together with their dedicated installation, commissioning and support teams complement our sophisticated solutions.”

“Since its first general availability, one of the well-known shortcomings of the GPS system was lack of indoor or underground coverage,” said Charles Curry, managing director with Chronos. “Many have tried to solve this with various technologies over the years. Syntony’s innovative technology offers underground GNSS coverage for PNT applications. We are very excited by the possibilities and pleased to be partnering with them to offer their solution for critical infrastructure applications in the UK.”

In addition, Chronos will also supply Syntony’s sophisticated GNSS simulators used in the aerospace and defence industries for product testing.