Comput Methods Programs Biomed - Performance comparison of accelerometer calibration algorithms based on 3D-ellipsoid fitting methods.

Tópicos

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Resumo

Calibration of accelerometers can be reduced to 3D-ellipsoid fitting problems. Changing extrinsic factors like temperature, pressure or humidity, as well as intrinsic factors like the battery status, demand to calibrate the measurements permanently. Thus, there is a need for fast calibration algorithms, e.g. for online analyses. The primary aim of this paper is to propose a non-iterative calibration algorithm for accelerometers with the focus on minimal execution time and low memory consumption. The secondary aim is to benchmark existing calibration algorithms based on 3D-ellipsoid fitting methods. We compared the algorithms regarding the calibration quality and the execution time as well as the number of quasi-static measurements needed for a stable calibration. As evaluation criterion for the calibration, both the norm of calibrated real-life measurements during inactivity and simulation data was used. The algorithms showed a high calibration quality, but the execution time differed significantly. The calibration method proposed in this paper showed the shortest execution time and a very good performance regarding the number of measurements needed to produce stable results. Furthermore, this algorithm was successfully implemented on a sensor node and calibrates the measured data on-the-fly while continuously storing the measured data to a microSD-card.

Resumo Limpo

calibr acceleromet can reduc dellipsoid fit problem chang extrins factor like temperatur pressur humid well intrins factor like batteri status demand calibr measur perman thus need fast calibr algorithm eg onlin analys primari aim paper propos nonit calibr algorithm acceleromet focus minim execut time low memori consumpt secondari aim benchmark exist calibr algorithm base dellipsoid fit method compar algorithm regard calibr qualiti execut time well number quasistat measur need stabl calibr evalu criterion calibr norm calibr reallif measur inact simul data use algorithm show high calibr qualiti execut time differ signific calibr method propos paper show shortest execut time good perform regard number measur need produc stabl result furthermor algorithm success implement sensor node calibr measur data onthefli continu store measur data microsdcard

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