Sensor Calibration

When using sensor like accelerometers, gyroscopes, magnetometers - all sensors used for navigation purposes - there is always the need to know about their performance in terms of noise, bias, bias stability, and other calibration parameters to either correct the sensors to get better / correct results or to improve the filter result of a sensor-integrated system. Another need for sensor calibration / investigation is that you are not sure about the actual performance of a sensor because there is no data sheet or some data is missing on the data sheet or you do not trust the data sheet or you want to be sure that the system you bought is as good as promised. All these afore mentioned sensor can be investigated and calibration parameter can be estimated. This is done for our scientific investigations but can also be offered as a service for you. The investigations are done using special measurement setups. For example, we have a single-axis turn table with turn rates up to 20°/s. For higher dynamics, we can mount the reference equipment with the equipment to investigate on a car to do two-dimensional analysis. For three-dimensional calibration, we have frames to mount the equipment in varous 3D orientations or move the sensors in all directions. For accelerometers, we can estimate e.g.
  • bias and bias stability
  • scale factors
For gyroscopes, we can calibrate
  • bias (often also called drift) and its stability
For magnetometers, we can provide calibration parameters for
  • deviation (systematic errors in the measurement resulting from constant magnetic materials in the surrounding)
  • declination (systematic offset between magnetic north and geographic north)
If you are interested in our research or calibration procedures, or have further needs, please contact us.

GNSS evaluation

We are doing research on GNSS receivers and algorithms, and hence have a great experience with GNSS receivers, antennas and algorithms. For our research, it is always needed to evaluate the achieved results and compare it with a ground truth. To do so, we have to great possibilities:
  • geodetic pillar network spread over the campus
  • calibrated sensor platform for dynamic investigations
In case of static investigations, we can mount GNSS receiver on stable geodetic pillars with known coordinates and investigate antenna performance, receiver performance or algorithm performance. Using RTK providers or the IGS station Lustbühel, one can simulate nearly every baseline length for RTK investigations. For dynamic conditions, we put the GNSS equipment on a calibrated car platform and can drive under different conditions (urban, suburban etc.). The reference for these kinematic conditions is built by a high-precision GNSS-INS environment unique in the scientific field at least in Austria. For receiver performance evaluations, we have an antenna splitter to see how different receiver act when they are getting the same signal at the same time, under static or dynamic conditions.
Manfred Wieser
Steyrergasse 30/III
8010 Graz
Tel: +43/316/873-6348
Fax: +43/316/873-8888