Rail Survey

Rail surveys present some of the most challenging operating conditions for GNSS survey systems. Bridges, cuttings, tunnels, overhead equipment and urban interference all affect the accuracy and availability of GNSS measurements, which rely on receiving a good number of clean signals directly from the satellites. This lack of GNSS reception means there are numerous stretches of track where alternative survey techniques must be employed, which can be a time-consuming and costly process.

Our products solve these problems because they don’t rely on just one measurement technology. As well as using the measurements from two GNSS receivers they also use inertial measurements to calculate and maintain position estimates. In practical terms this means once the system is set up and working, it doesn’t matter if the sensor passes through a deep cutting or under a bridge where the GNSS signals are blocked, because it can maintain all its estimates based on the inertial measurements. It also means the system provides a constant picture of its orientation at up to 250 Hz, which can be used as a georeferencing datum for video and lidar systems.



The perfect route to upgrading your GPS. Protect your investment and combine your GPS with our Inertial+. Designed as a drop in component, the Inertial+ blends accelerometers and gyros with data from an external GPS receiver. It gives smooth, continuous position measurements, even in poor GPS environments. The Inertial+ is a true Inertial Navigation System at an exceptionally low cost.



The Survey+ is a compact, turnkey GNSS-aided inertial navigation system for providing stable, reliable and highly accurate position and orientation measurements. It is designed for airborne laser scanning applications as well as road surveying and pavement inspection projects. It seamlessly integrates with other on-board sensors like aerial cameras, laser scanners or LIDAR technology.

Trackbed scanning
By cleverly blending GNSS and inertial measurements, our sensors get the position measurements you need, even when operating in deep cuttings and in and around tunnels.

Lineside vegetation monitoring
Position, orientation and velocity accuracy is important, but so is the ability to use those measurements. Our sensors easily integrate with external sensors, acting as a trigger, or responding to external events.

Capturing track geometry
In addition to real-time output, our sensors come with comprehensive post-processing software, allowing data captured over large areas to be processed to 2 cm RTK accuracy without local base-stations.

General mapping

GPS systems don’t perform well in deep cuttings and tunnels. The Inertial+ increases the reliability and accuracy of your existing GNSS system by converting it into an inertial navigation system.

Position measured up to 1 cm accuracy
Additional measurements unavailable to GNSS-only solutions
No data interruptions during GNSS blackout
One box solution for easy installation
Distance output to trigger external devices
Event input to synchronise with external devices
100 or 250 Hz systems
Real-time output
Single satellite aiding
NTRIP receiver compatible
Post-processing using RINEX files
Comprehensive software suite included at no extra cost