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Satellites Finding Other Satellites

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Analysis of error in time difference of arrival measurements introduced by the motion of satellite-based receivers

Stephen M. Dumas; T. Alan Lovell; Andrew J. Sinclair; Gregory D. Durgin
2017 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE)

This article analyzes the ranging errors in a new type of satellite ranging configuration:  a system where a moving constellation of small satellites (e.g. cubesats) track other moving space-based targets.  This work was sponsored by AFRL and performed in conjunction with Kirtland Air Force Base.

Seeing Through Walls

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On-Wall, Wide Bandwidth E-shaped Patch Antenna for Improved Whole-Home Radio Tomography

Cheng Qi, Peter Hillyard, Amal Al-Husseiny, Neal Patwari, Gregory D. Durgin
IEEE Journal of Radio Frequency Identification

This recent journal article documents a multi-year collaborative effort with the University of Utah to perform topography on buildings by slapping sensor networks around the building perimeter.  Measurement campaigns around Atlanta-area homes show how a custom-designed E-patch antenna can operate when placed against a variety of building materials.  Using this antenna, the RF tomography accuracy improves significantly, identifying moving people within the building with 1-2 meters.  The goal is to track emergency workers with a quick-to-deploy, ad-hoc wireless sensor network.

Cell Phone Localization with RF Signal Strength Fingerprints

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Indoor/Outdoor Location of Cellular Handsets Based on Received Signal Strength

DocumentID: PG-TR-040618-JZ
Date: June 18, 2004
Jian Zhu and Prof. Gregory D. Durgin

This report is a the first university measurement campaign demonstrating the ability of cell phone received signal strength fingerprinting to provide E911-grade localization of users.  Performed by Georgia Tech students with help from Polaris Wireless LLC, this technique is now used all over the world to supplement GPS in emergency response and lawful intercept situations.