Investigation of the Relationship Between Localization Accuracy and Sensor Array

TL;DR

This study investigates how sensor array configurations affect magnetic localization accuracy, demonstrating that even sensor distribution yields significantly better precision with errors below 1mm and 1 degree.

Contribution

It provides experimental evidence on the impact of sensor array layout on magnetic localization accuracy using a dipole model and Levenberg-Marquardt optimization.

Findings

Even sensor distribution improves localization accuracy

Average localization error is 0.47mm with optimal sensor layout

Average orientation error is 0.92 degrees

Abstract

The magnetic localization method has been widely studied, which is mainly based on the accurate mapping of the magnetic field generated by magnetic sources. Many factors affect localization accuracy in the experiment. Therefore, this paper tends to study the relationship between localization accuracy and sensor array with different experiments. This system uses a small magnet as the magnetic source, and the mathematical model of the magnetic positioning system is established based on the magnetic dipole model to estimate the magnetic field. The Levenberg-Marquardt algorithm was used to construct a magnetic positioning objective function for comparison experiments. Experimental results show:When the sensor is evenly distributed around the magnet, the positioning accuracy is higher than other layout of the sensor array, the average localization error is 0.47mm and the average orientation error is 0.92 degree.