@inproceedings{206,
  author = {Will Hedgecock and Miklos Maroti and Janos Sallai and Peter Volgyesi and Akos Ledeczi},
  title = {High-Accuracy Differential Tracking of Low-Cost GPS Receivers},
  abstract = {In many mobile wireless applications such as the automated driving of cars, formation flying of unmanned air vehicles, and source localization or target tracking with wireless sensor networks, it is more important to know the precise relative locations of nodes than their absolute coordinates. GPS, the most ubiquitous localization system available, generally provides only absolute coordinates. Furthermore, low-cost receivers can exhibit tens of meters of error or worse in challenging RF environments. This paper presents an  approach that uses GPS to derive relative location information for multiple receivers. Nodes in a network share their raw satellite measurements and use this data to track the relative motions of neighboring nodes as opposed to computing their own absolute coordinates. The system has been implemented using a network of Android phones equipped with a custom Bluetooth headset and integrated GPS chip to provide raw measurement data. Our evaluation shows that centimeter-scale tracking accuracy at an  update rate of 1 Hz is possible under various conditions with the presented technique. This is more than an order of magnitude more accurate than simply taking the difference of reported absolute node coordinates or other simplistic approaches due to the presence of uncorrelated measurement errors.},
  year = {2013},
  journal = {ACM 11th International Conference on Mobile Systems, Applications, and Services (MobiSys '13)},
  month = {06/2013},
  publisher = {ACM},
  address = {Taipei, Taiwan},
}