SubWAVE Underground GNSS Coverage

Safety for Underground Personnel

Product Information

Available all around the globe for positioning, navigation, and timing, GPS and GNSS signals cannot reach underground facilities. Operators and workers in underground stations, tunnels and mines are therefore deprived of the formidable advantages of geolocation, both for safety and management efficiency.

More powerful than a GPS repeater, Syntony’s SubWAVE is capable of generating genuine GNSS coordinates in real time computable by standard receivers. Operators can monitor their whole network and locate their assets and workers in real time with longitude, latitude, and altitude coordinates.

Available with precision tailored to clients’ applications, SubWAVE is the perfect solution to enable every underground location challenge.

Universal Positioning Solution

Generating genuine GNSS signals in real-time, SubWAVE allows receivers to keep on computing their position when entering an equipped area, ensuring the continuity of service, natively.

Seamless Transition Outdoor/Underground

SubWAVE generates genuine GNSS signals in real-time and allows receivers to keep on computing their position when entering an equipped area, ensuring the native continuity of service.

Compatible with existing PMR/TETRA Receivers

Based on the most popular location technology in the world, SubWAVE broadcasts a signal computable by every GNSS-enabled professional receiver already deployed, reducing drastically costs of deployment and technology integration.

No Interference with other RF Feeds

Designed to fit in the existing telecom network, SubWAVE GNSS emulated signals are conceived on specific bandwidths preventing them from interfering with other crucial and existing RF feeds.

GNSS Coverage Extension Fitting Specific Industry Needs

Each industry has its specifics and relies differently on geolocation services. Working with key players from different sectors, SubWAVE has been developed to provide the best service needed.


Available for the entire GPS Coverage Extension in metro tunnels and platform, SubWAVE can also be deployed in rail tunnels to keep locating trains, workers, and improve both safety and efficiency.


In road tunnels, GPS Coverage extension can improve safety of workers and maintenance operations, as well as continuity of service for every GPS user for navigation, platooning, etc.


Crucial in both open pits and underground mines, assets location is the backbone of optimised exploitation in mining. Already deployed by major key players in the industry, GPS-enabled receivers work instantly with SubWAVE GPS coverage extension underground.

Groundbreaking Technology for Subterranean Locations

The SubWAVE product emits a signal similar to standard GPS/GNSS enabling all existing and future chipsets to operate in subterranean locations. SubWAVE is the only solution worldwide which has this capability.

Enabling GNSS-Based Fleet Monitoring in Covered Bus Terminals

The new Haninge Bus Terminal south of Stockholm has been equipped with SubWAVE GPS Coverage Extension. The installation enables full seamless continuity of GPS-based monitoring for bus traffic and enables very accurate passenger information, so commuters can plan their journey directly from the feed on the SL website and smartphone app, together with the easy navigation inside the bus terminal.


  • Plug and play installation in DAS infrastructure used by cellular or PMR
  • No interference with train control or telecoms systems
  • No receiver or server modification
  • Compliant with existing PMR/TETRA receivers
  • Seamless transition with the outdoor/indoor
  • Does not require an App to be installed on the smartphone

The Chronos difference

Contact our team today to discuss how the groundbreaking Syntony SubWAVE solution can provide 100% GPS GNSS coverage in subterranean locations.

Key Features

  • From 3 up to 6 RF outputs
  • Extensive options
  • Full time and location control
  • PVT definition for each zone with positioning precision along the leaky feeder
  • Emission power for each zone
  • Synchronisation control with outdoor GNSS at << 1 microsecond
  • Alarm monitoring
  • GPS redundancy
  • Front LED error status
  • Extractable SSD drive for higher and easy maintenance
  • High reliability
  • Easy maintenance