DocumentCode :
2581679
Title :
Joint location and parameter tracking of mobile nodes in wireless networks
Author :
Sathyan, T. ; Hedley, M.
Author_Institution :
ICT Center, CSIRO, Marsfield, NSW, Australia
fYear :
2012
fDate :
23-26 April 2012
Firstpage :
1195
Lastpage :
1203
Abstract :
Achieving very high localization accuracy in wireless networks that measure time of arrival (TOA) is a challenging task, especially when low cost hardware is used. The local oscillators used in the wireless nodes will drift over time, which will result in frequency and time offset between different clocks. Synchronization between the clocks must be maintained to obtain highly accurate TOA measurements. The delay in the radio frequency electronics can also vary with time and environmental variation and for accurate localization this variation must be accounted for as well. Although calibrating these parameters prior to the operation of the network is one solution, it is not an option for networks that operate for longer periods of time or those that are rapidly deployed. In this paper we propose an algorithm that jointly tracks the frequency offset and radio delay of all the nodes in the network along with the location of the mobile nodes. The algorithm calculates the round trip delay measurements, which eliminates the need to estimate the time offset. We also derive the posterior Cramèr Rao lower bound (PCRLB) for the joint estimation problem, which provides a bound on the maximum performance achievable. Through simulations we show that the performance of the proposed algorithm is in close agreement with the PCRLB for both the non-kinematic and kinematic state estimation.
Keywords :
clocks; mobile radio; object tracking; oscillators; synchronisation; time-of-arrival estimation; local oscillators; location tracking; low cost hardware; mobile nodes; non-kinematic state estimation; parameter tracking; posterior Cramèr Rao lower bound; radio frequency electronics; round trip delay measurements; synchronization; time of arrival; time offset; wireless networks; wireless nodes; Noise; Noise measurement; Kalman filter; RF delay; RF-Positioning and tracking; frequency offset; time of arrival; unscented Kalman filter;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Position Location and Navigation Symposium (PLANS), 2012 IEEE/ION
Conference_Location :
Myrtle Beach, SC
ISSN :
2153-358X
Print_ISBN :
978-1-4673-0385-9
Type :
conf
DOI :
10.1109/PLANS.2012.6236975
Filename :
6236975
Link To Document :
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