TunnelSat

Extend your GPS coverage to provide accurate positioning for navigation, emergency location and IoT tracking systems in subterranean structures such as tunnels, mines, and underground parking and retail spaces.

What is TunnelSat?

TunnelSat provides accurate, real-time GPS signals to enhance navigation, safety, operational efficiency, and the provision of location-based services in environments where live-sky GPS is not possible.

Utilising a zone-based solution for uninterrupted GPS reception underground, each zone represents a static latitude, longitude and altitude based on the actual location of the zone and not the location of a surface antenna which other repeater only solutions rely upon.

Using live ephemeris data, TunnelSat generates positions almost indistinguishable from true GPS, with seamless transitioning from live-sky GNSS to simulation and back.

Key Features

• Seamless transition between outdoor live-sky GPS and indoor simulated GPS.
• Universal solution for existing GPS-based equipment.
• Compatible with all smartphones and professional P25 or TETRA receivers.
• No signal leakage or RF interference.
• GPS receivers require no additional accessories or software.

Applications

The ability to gain accurate positioning above ground is often taken for granted, but what happens when you require the same service but move to an underground environment? Having a solution that blends seamlessly with existing GPS technologies is essential for many applications.

• Enhanced safety in emergencies
• Navigation and location accuracy
• Improved public transport management
• Location-bases services and analytics
• Worker and asset tracking
• Autonomous vehicle operation

How does it work?

A series of radiating antennas are placed within a tunnel or underground structure. By connecting to a server recording live-sky GPS and utilising an accurate timing source, TunnelSat simulates the satellites signals that each antenna location would receive as if it was in the open and sends them in real-time.

A vehicle’s GNSS receiver or GPS device will use the GPS signals transmitted by the radiating antenna to calculate its position within the tunnel, depending on the vehicle's speed and its GNSS reporting frequency.