While retaining most of the benefits that TPS, iTPS
have, TPSS relaxes the strict requirement that the beacon stations should be
able to reach all the sensor nodes in the network. Simulation results show that
TPSS is a simple, e?®ective and practical location discovery scheme that can
be used in sensor networks.
189
(a) epoch=1
(b) epoch=3
Fig. 8. Illustration of Position Errors in terms of Di?®erent Epochs and Measurement
Errors: with Di?®erent Network Density.
190 Fang Liu et al.
0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
Measurement Error (Stdv)
Average Distance Error
150 nodes
175 nodes
200 nodes
225 nodes
250 nodes
275 nodes
300 nodes
0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01
0
0.05
0.1
0.15
0.2
0.25
Measurement Error (Stdv)
Average Distance Error
150 nodes
175 nodes
200 nodes
225 nodes
250 nodes
275 nodes
300 nodes
Chapter 7 TPSS
References
1.
pp. 775??“784.
2.
bility, IEEE PIMRC, September 2002.
3.
Oct. 2000, pp. 28-34.
4. Bulusu, John Heidemann, Deborah Estrin, Density adaptive algorithms
for beacon placement, IEEE ICDCS 2001, April 2001.
5.
6.
406??“416.
7.
America and the Caribbean, 2001.
8.
2004.
9.
less Sensor Networks, 2003.
10. Lance Doherty, Kristofer Pister, Laurent. E. Ghaoui, Convex Position Estimation
in Wireless Sensor Networks, IEEE INFOCOM 2001, April 2001.
11.
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