Title :
The non-line of sight problem in mobile location estimation
Author :
Wylie, Marilynn P. ; Holtzman, Jack
Author_Institution :
Dept. of Electr. & Comput. Eng., Rutgers Univ., Piscataway, NJ, USA
fDate :
29 Sep-2 Oct 1996
Abstract :
We consider the problem of tracking mobile stations using the ranging measurements from multiple base stations (BSs), without a priori knowledge of which BSs (if any) have a direct line of sight (LOS) range measurement. The two key contributions of this paper are to show that (1) it is possible to discriminate between LOS versus non-LOS (NLOS) measurements at each BS by using the time history of its range measurements in a simple hypothesis testing problem and (2) it is possible to correct the NLOS ranging error by exploiting a priori knowledge of the statistical characteristics of the system´s standard measurement noise. Simulation examples are presented and the RMS error is compared to the Cramer Rao lower bound on location estimation
Keywords :
distance measurement; error correction; land mobile radio; measurement errors; radio direction-finding; tracking; Cramer Rao lower bound; NLOS ranging error correction; RMS error; hypothesis testing; mobile location estimation; mobile stations tracking; multiple base stations; non-line of sight problem; range measurements; statistical characteristics; Computer networks; Error correction; History; Intelligent networks; Laboratories; Lifting equipment; Measurement standards; Noise measurement; Time measurement; Working environment noise;
Conference_Titel :
Universal Personal Communications, 1996. Record., 1996 5th IEEE International Conference on
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-3300-4
DOI :
10.1109/ICUPC.1996.562692
