RT User Manual
Revision: 190902
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Internal data logging enables the data to be reprocessed post-mission. Data can be
collected in the unit, downloaded using “ftp”, processed on a PC and viewed using the
NAVdisplay.
Easy operation
There is minimal configuration required to use the system. The configuration can be
saved to the RT so it can operate autonomously without user intervention. A lot of work
has been put into the initialisation of the inertial algorithms so the RT can reliably start
to navigate in the vast majority of situations.
The single unit contains inertial sensors, GNSS receiver, data storage and CPU. One or
two antennas need to be mounted outside the vehicle where they have a clear view of the
sky. A 10–50 V dc power supply can be obtained from most vehicles. A laptop computer
allows real-time viewing of the results.
Self-correcting
Unlike conventional inertial navigation systems, the RT uses GNSS to correct all its
measurements. GNSS makes measurements of position, velocity and (for dual antenna
systems) heading. Using these measurements, the RT is able to keep other measurements,
such as roll and pitch, accurate. Tight coupling of the GNSS and inertial measurements
means the raw GNSS data can also be used. There is no drift from the RT in any of the
measurements while GNSS is present.
Interchangeable
The RT500 (v1) and RT3000 (v3) products have identical output capabilities. The serial
port, Ethernet, Wi-Fi and CAN bus are the same on RT500 and RT3000 devices including
the data formats. Each device comes with two user cables which house the connections
needed for data transfer from the RT to other devices e.g. laptop, Data Acquisition
system, LiDAR etc.
Advanced processing
In poor GNSS environments, drift times can be halved by using the combined results of
processing forwards and backwards in time. Our proprietary gx/ix™ processing engine
can further improve performance with single satellite aiding algorithms and tight
coupling of the inertial and GNSS measurements, meaning position updates even with
fewer than four satellites in view.
