Reference Trajectory - exact knowledge of your path

This picture shows the high accurate inertial measurement unit of the institute of geodesy including ring laser gyroscopes.

Do you need to know the performance of your navigation system or device? Do you want to have lane-level road information ?

We are proud to be the only university institute in Austria and maybe in Europe possessing a high accurate navigation-grade inertial navigation system like the iMAR iNAV-RQH-003 with ring laser gyros better than 0.003 deg/hr. With this system, we can

  • survey roads,
  • create ground truth data for commercial systems as well as scientific investigations with accuracies less than a cm,
  • calibrate inertial sensors (sensor errors, relative orientation, etc.)
  • evaluate navigation equipment

This high-precision IMU is usually mounted on our tailored calibrated platform for car roofs where we can add up to 5 GNSS antennas and multiple GNSS receivers. Using GNSS antenna splitter, it is possible to compare GNSS receivers using the same antenna. Knowing all the base lines with an accuracy of less than a millimiter, we can also compare different combinations of GNSS receivers and antennas at the same time.

When processing reference trajectories, we usually collect all measurement data during the drive to do post-processing to achieve the highest possible accuracy. Therefore, we process the GNSS measurements with data from a GNSS base station using the well-known RTK method (sometimes not fully correctly called DGPS). By doing this in post-processing, we do not suffer from latencies or communication problems between base station and rover, and hence can achieve much better results. Another huge advantage of post-processing is that the data can be processed forward and reverse (both directions in time), to get the best result in case of GNSS interruptions.

This picture shows a car carrying the platform of the institute with 4 GNSS antennas and receivers and different kinds of inertial measurement units
┬ę ifG, TU Graz

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Manfred Wieser
Steyrergasse 30/III
8010 Graz
Tel: +43/316/873-6348
Fax: +43/316/873-8888