Deployment, Calibration, and Measurement Factors for Position Errors in 802.11-Based Indoor Positioning Systems

Indoor positioning systems based on 802.11 and fingerprints offer reasonably low position errors. The authors study the deployment, calibration, and measurement factors for position errors by systematically investigating the number of access points, the number of samples in the training phase, the number of samples in the position determination phase, and the setup of the grid of reference points. Further, they bring out the best of the positioning system by selecting advantageous values for these parameters. For their study, they utilize a test environment with a size of about 312 square meters that is covered with 612 reference points arranged in an equally spaced grid.