A combined approach for NLOS mitigation in cellular positioning with TOA measurements
15th European Signal Processing Conference, EUSIPCO 2007, Poznan, Polonya, 3 - 07 Eylül 2007, ss.530-534, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: Poznan
- Basıldığı Ülke: Polonya
- Sayfa Sayıları: ss.530-534
- Boğaziçi Üniversitesi Adresli: Evet
Özet
In this paper, we propose a method to mitigate the effects of non line of sight errors in range-based localization of mobile phones. The TOA/range measurement errors are dynamically tracked with a Kalman filter, which are then combined through a constrained weighted least squares (CWLS) algorithm to locate a mobile station with respect to three or more base stations. NLOS situations, which cause a large error in TOA readings, are initially detected and handled with a highly biased Kalman filter. The use of CWLS further mitigates NLOS errors. Simulation results clearly demonstrate the improvement offered by this combined approach. © 2007 EURASIP.