© The Institution of Engineering and Technology
Location finding is a major application for indoor wireless sensor networks. Some of these applications include, but not limited to, logistic tracking for goods, monitoring of patients in hospitals, security application and location aware advertising. In practice, there are many factors such as noise, non-line of sight (NLOS) influence, device crystal clock time drift and accurate synchronisation among sensor nodes that can affect the ranging accuracy. In this study, the authors first propose how non-synchronised sensor nodes can apply a time difference of arrival localisation technique to compute the position of the tags. Next, the authors discuss the impact of crystal clock time drift on localisation accuracy and propose a scheme to compensate them among the sensor nodes in order to reduce its influence on localisation errors. This allows low-cost devices to operate in the network with low crystal clock qualities.
References
-
-
1)
-
Francois, C.P.S., Lin, Z., Lee, J.X.: `Symmetric multi-way ranging for wireless sensor network', Proc. IEEE PIMRC, September 2007, p. 1–5.
-
2)
-
H. Rainer
.
(2005)
Symetric double sided – two way ranging.
-
3)
-
J. Xu ,
M. Ma ,
C.L. Law
.
Position estimation using ultra-wideband time difference of arrival measurements.
IET Sci., Meas. Technol.
,
1 ,
53 -
58
-
4)
-
Guowei, S., Rudolf, Z., Reiner, S.T.: `Performance comparison of TOA and TDOA based location estimation algorithms in LOS environment', WPNC'08, March 2008, p. 71–78.
-
5)
-
Jeremy, E., Lewis, G., Deborah, E.: `Fine grained network time synchronization using reference broadcasts', Proc Fifth Symp. on Operating System Design and Implementation, December 2002.
-
6)
-
P. Neal ,
O.H. Alfred ,
M. Perkins ,
S.C. Neiyer ,
R.J. O'Dea
.
Relative location estimation in wireless sensor network.
IEEE Trans. Signal Process.
,
8 ,
2137 -
2148
-
7)
-
Neal, P., O'Dea, R.J., Yanwei, W.: `Relative location in wireless networks', Proc. IEEE VTC, May 2001, 2, p. 1149–1153.
-
8)
-
P.G. Marilynn
.
(2005)
N-Way time transfer (‘NWTT’) method for cooperative ranging.
-
9)
-
J. Yi ,
C.M.L. Victor
.
An asymmetric double sided two-way ranging for crystal offset.
ISSSE
,
525 -
528
-
10)
-
L. Zhao ,
G. Yao ,
J.W. Mark
.
Mobile positioning based on relaying capability of mobile stations in hybrid wireless networks.
IET Radar Sonar Navig.
,
5 ,
762 -
770
-
11)
-
D.G. Matthew ,
F.S. Harvey
.
A linear closed-form algorithm for source localisation from time-differences of arrival.
IEEE Signal Process. Lett.
,
1 -
4
-
12)
-
K. Yu ,
Y.J. Guo ,
M. Hedley
.
TOA-based distributed localisation with unknown internal delays and clock frequency offsets in wireless sensor networks.
IET Signal Process.
,
2 ,
106 -
118
-
13)
-
D. Benoit ,
P. Jean-Benoit ,
A. Chadi
.
Joint distributed synchronization and positioning in UWB ad hoc networks using TOA.
IEEE Trans. Microw. Theory Tech.
,
4 ,
1896 -
1911
-
14)
-
Y. Saito ,
Y. Sanada
.
Effect of clock offset on an impulse radio ultra wideband ranging system with comparators.
IET Commun.
,
6 ,
1024 -
1029
-
15)
-
Damian, K., Sean, M., Beth, L., Terry, D.: `Single access point localisation for wearable wireless sensors', IEEE EMBS, 2008, p. 4443–4446.
-
16)
-
Y.T. Chan ,
K.C. Ho
.
A simple and efficient estimator for hyperbolic location.
IEEE Trans. Signal Process.
,
8 ,
1905 -
1915
-
17)
-
S. Fikret ,
Y. Bulent
.
Time synchronization in sensor networks: a survey.
IEEE Netw.
,
4 ,
45 -
50
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-com.2010.0183
Related content
content/journals/10.1049/iet-com.2010.0183
pub_keyword,iet_inspecKeyword,pub_concept
6
6