GPS Penetrates Underground, Concrete Structures with SubWAVE - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

GPS Penetrates Underground, Concrete Structures with SubWAVE

South of Stockholm, Sweden, the new Haninge Bus Terminal has been equipped with SubWAVE GPS Coverage Extension from Syntony. This installation enables full seamless continuity of GPS-based monitoring for bus traffic and allows accuracy to the passenger information system.

The GPS signal will no longer be lost when the buses enter the new Haninge Terrassen Terminal. In March, Syntony GNSS and RF Coverage AB deployed SubWAVE Continuous technology in the concrete-covered facility.

Using leaky feeders, SubWAVE Continuous technology emulates the GPS signal for every receiver in the area. They are then able to compute their own position with an accuracy similar to outside urban environments. Traffic Managers and professionals can determine if their buses are stopped or moving in the terminal, and even in which slot they are parked! And an additional software can narrow down the accuracy to a 5-meter level.

Additionally, this information can be passed on to provide very accurate passenger information, improving user experience of the service. Haninge commuters will be able to better plan their journey, directly from the feed on the Stockholm Public Transport (SL)  website and smartphone app, along with navigating inside the bus terminal with ease.

Since most smartphones are equipped with GPS chipsets, the signal emulated by SubWAVE can be understood natively, even in non-dedicated applications like Google and Apple Map. This access to GPS-based indoor positioning enables common services originally used outdoors only. The public can benefit from GPS-based guidance, and rescue forces can enhance their response efficiency to emergencies:

The GPS coverage extension also enables location of emergency calls. With this information, rescue forces can access the victims more efficiently, saving precious time, and lives.

Designed to map the existing architecture of PMR systems (Private Mobile Radio), its installation requires no modification of the terminals and is compliant with the existing standards (TETRA, P25). By emitting a perfect emulation of the “real” GPS, SubWAVE can even benefit the public in underground places equipped with the system, whether it is for safety reasons (locate emergency calls) or to improve the service (guidance of passengers).

SubWAVE offers multiple accuracy levels, depending on the needs, the use cases, and the environment. From the Zone mode, allowing to narrow down the location of emergency calls, to the Continuous mode, with a measured accuracy level of 2 meters, allowing, with the help of a Syntony software installed on receiver, tracking and navigation inside a tunnel (subway, train, road), a subway station, a mine, an underground parking, etc.

Stockholm underground subway has been fully equipped with SubWAVE  Zone technology since 2017. With the new installation, SL maintains quality of service to its 320 million annual passengers.