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A self-localization method for wireless sensor networks (2003)
| Content Provider | CiteSeerX |
|---|---|
| Author | Moses, Olph L. Krishnamurthy, Dushyanth Patterson, Robert |
| Abstract | We consider the problem of locating and orienting a network of unattended sensor nodes that have been deployed in a scene at unknown locations and orientation angles. This self-calibration problem is solved by placing a number of source signals, also with unknown locations, in the scene. Each source in turn emits a calibration signal, and a subset of sensor nodes in the network measures the time-of-arrival and direction-of-arrival (with respect to the sensor node’s local orientation coordinates) of the signal emitted from that source. From these measurements we compute the sensor node locations and orientations, along with any unknown source locations and emission times. We develop necessary conditions for solving the self-calibration problem and provide a maximum likelihood solution and corresponding location error estimate. We also compute the Cramer-Rao Bound of the sensor node location and orientation estimates, which provides a lower bound on calibration accuracy. Results using both synthetic data and field measurements are presented. keywords: sensor networks, localization, location uncertainty, Cramer-Rao bound 1. |
| File Format | |
| Volume Number | 4 |
| Journal | EURASIP Journal on Applied Signal Processing |
| Language | English |
| Publisher Date | 2003-01-01 |
| Access Restriction | Open |
| Subject Keyword | Self-localization Method Wireless Sensor Network Unknown Location Sensor Node Self-calibration Problem Sensor Node Location Orientation Angle Calibration Signal Maximum Likelihood Solution Location Uncertainty Orientation Estimate Necessary Condition Local Orientation Coordinate Source Signal Field Measurement Unattended Sensor Node Synthetic Data Unknown Source Location Cramer-rao Bound Calibration Accuracy Emission Time Sensor Network Location Error Estimate |
| Content Type | Text |
| Resource Type | Article |
