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Brady O' Hanlon

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Carrier-Phase Anomalies Detected on SVN-48   May 17, 2010
By: Brady O' Hanlon,Mark L. Psiaki,Paul M. Kintner Jr.,Steven P. Powell

Anomalous behavior of the L1 C/A-code carrier phase has been detected on PRN07/SVN-48. The anomalies are sudden step-like changes of phase by about 10 degrees/5 millimeters. These steps are followed by negative steps of the same magnitude that restore the original phase time history. These...more >>

Article
Assessing the Spoofing Threat   January 1, 2009
By: Brady O' Hanlon,Brent Ledvina,Mark L. Psiaki,Paul M. Kintner Jr.,Todd E. Humphreys

A portable spoofer implemented on a digital signal processor mounts a spoofing attack, characterizes spoofing effects, and suggests possible defense tactics. GNSS users and receiver manufacturers should explore and implement authentication methods against sophisticated spoofing attacks.




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