Analysis of wireless geolocation in a non-line-of-sight environment

被引:301
作者
Qi, YH
Kobayashi, H
Suda, H
机构
[1] Natl Inst Informat & Commun Technol, UWB Technol Inst, Yokosuka, Kanagawa 2390847, Japan
[2] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
[3] NTT Corp, DoCoMo, Wireless Labs, Yokohama, Kanagawa 2398536, Japan
关键词
geolocation; TOA; TDOA; AOA; signal strength based positioning; Cramer-Rao Lower Bound (CRLB); generalized-CRLB; maximum likelihood estimation (MLE); maximum a posteriori probability (MAP) estimation;
D O I
10.1109/TWC.2006.03024
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We present an analysis of the time-of-arrival (TOA), time-difference-of-arrival (TDOA), angle-of-arrival (AOA) and signal strength (SS) based positioning methods in a non-line-of-sight (NLOS) environment. Single path (line-of-sight (LOS) or NLOS) propagation is assumed. The best geolocation accuracy is evaluated in terms of the Cramer-Rao Lower Bound (CRLB) or the generalized CRLB (G-CRLB), depending on whether prior statistics of NLOS induced errors are unavailable or available. We then show that the maximum likelihood estimator (MLE) using only LOS estimates and the maximum a posteriori probability (MAP) estimator using both LOS and NLOS data can asymptotically achieve the CRLB and the G-CRLB, respectively. Hybrid schemes that adopt more than one type of position pertaining data and the relationship among the four methods in terms of their positioning accuracy are also investigated.
引用
收藏
页码:672 / 681
页数:10
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