Modeling and Optimizing Positional Accuracy based on Hyperbolic Geometry for the Adaptive Radio Interferometric Positioning System
Date Issued
2007
Date
2007
Author(s)
Wu, Hao-Ji
DOI
en-US
Abstract
One of the most important performance objectives for a localization system is positional accuracy. It is fundamental and essential to general location-aware services. The radio interferometric positioning (RIP) method [1] is an exciting ap-proach which promises sub-meter positional accuracy. In this work, we would like to enhance the RIP method by dynamically selecting the best anchor nodes as beacon senders, and further optimizing the positional accuracy when tracking multiple targets. We have developed an estimation error model to predict posi-tional error of the RIP algorithm given different combinations of beacon senders. Building upon this estimation error model, we further devise an adaptive RIP method that selects the optimal sender-pair combination (SPC) according to the locations of targets relative to anchor nodes. We have implemented the adaptive RIP method and conducted experiments in a real sensor network testbed. Experi-mental results have shown that our adaptive RIP method outperforms the static RIP method in both single-target and multi-target tracking, and improves the av-erage positional accuracy by 47%~60% and re-duces the 90% percentile error by 55%~61%.
Subjects
感測網路
定位系統
無線電波干涉現象
測距
模型化
最佳化
雙曲線
Sensor Networks
Positioning System
Radio Interferometry
Ranging
Modeling
Optimizing
Hyperbolic Curve
Type
thesis