Nodes localization through data fusion in sensor network

The location of nodes in sensor network is an important problem with application in resource allocation, location sensitive browsing, and emergency communications. A key problem in sensor network location is the creation of a method that is robust to measurement quantization and measurement noise an...

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Bibliographic Details
Main Authors: Luo, R.C., Ogst Chen, Tu, L.C.
Format: Conference Proceeding
Language:English
Subjects:
Costs
Distance measurement
Fuses
Noise measurement
Noise robustness
Power measurement
Propagation losses
Quantization
Resource management
Sensor fusion
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Summary:The location of nodes in sensor network is an important problem with application in resource allocation, location sensitive browsing, and emergency communications. A key problem in sensor network location is the creation of a method that is robust to measurement quantization and measurement noise and also has a reasonable implementation cost. The RSS and TDoA are the popular distance measurement methods, but can be easy affected by noise and not independent. This paper explores a covariance intersection (CI) that fuses together location estimations obtained from power propagation loss measurements and propagation time to obtain higher accuracy location estimate. The performances of Kalman filter type estimators are severely affected by the ignored cross covariance. CI algorithm provides a mechanism to fuse two or more random variables with unknown correlation such that the computed covariance of the new estimate is consistent; therefore CI method is quite suitable for sensor network application. In simulation result shows that position estimates are correct within small ranging distance with few initial master nodes of the system.
ISSN:1550-445X
2332-5658
DOI:10.1109/AINA.2005.259