Effect of Propagation Model Calibration on DCM Positioning Accuracy in a Dense Urban Area

In this paper the authors evaluate the effect of propagation model calibration on the positioning accuracyobtained by a database correlation method (DCM). The calibration procedure defines a single calibration factor. This factor i s added to the predicted path loss to minimize the sum of the squared differences between predicted and measured received signa l strength values. The selected DCM algorithm (RF-FING+RTDPRED) employs a correlation database built using the Okumur aHata empirical propagation model. Additional diffraction losses are calculated using Epstein-Peterson’s method applied up on digital elevation models with building heights with a planar resolution of 10 meters. The experimental evaluation was ca rried out in a GSM radio access network in a dense urban area. Keywords— Okumura-Hata, Calibration, Database Correlation Method, Mobile Station, Positioning Accuracy.

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