Geolocation systems

Geolocation systems are very present in our daily lives. Their operation is often based on the use of satellite constellation and in particular Galileo and GPS. However in the absence of satellite positioning system is really not accurate. For this reason, it is sometimes useful to use an inertial unit in addition to the satellite positioning system. In the Angeo project, I participated in the development of this industrial product and in particular on the calibration phases of an inertial unit.  The European Union has decided to support it under the Horizon 2020 research and innovation program: 

http://www.angeo.fr/actus/Le-projet-ANGEO-2-soutenu-par-lUnion-Europeenn...
http://www.navocap.com/content/navocap/En_savoir_plus/Nos_projets_Recher...

Magnetometers and accelerometers are sensors that are now integrated in objects of everyday life like automotive applications, mobile phones and so on. Some applications need information of acceleration and attitude with a high accuracy. For example, MEMS magnetometers and accelerometers can be integrated in embedded like mobile phones and GPS receivers. The parameters of such sensors must be precisely estimated to avoid drift and biased values. Thus, calibration is an important step to correctly use these sensors and get the expected measurements. This paper presents the theoretical and experimental steps of a method to compute gains, bias and non orthogonality factors of magnetometer and accelerometer sensors. This method of calibration can be used for automatic calibration in embedded systems. The calibration procedure involves arbitrary rotations of the sensors platform and a visual 2D projection of measurements.

Numerical calibration for 3-axis accelerometers and magnetometers
F.CAMPS, S.HARASSE, A.MONIN / LAAS-CNRS
Manifestation avec acte : 2009 IEEE International Conference on Electro/Information Technology, Windsor (Canada), 7-9 Juin 2009, pp.217-221 , N° 09111.