Todd E. Humphreys

GPS jamming is a continuing threat. A detailed understanding of how the available jammers work is necessary to judge their effectiveness and limitations. A team of researchers from Cornell University and the University of Texas at Austin reports on their analyses of the signal properties of 18...more >>

Disruption created by intentional generation of fake GPS signals could have serious economic consequences. This article discusses how typical civil GPS receivers respond to an advanced civil GPS spoofing attack, and four techniques to counter such attacks: spread-spectrum security codes, navigation...more >>

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.

Researchers sought to determine whether the GIOVE-A L1 binary offset carrier signal could be acquired and the PRN codes uncovered using codeless acquisition and statistical signal processing techniques. The short answer: Yes!

Galileo, Europe's answer to the U.S. Global Positioning System, achieved a milestone on December 28, 2005, with the launch of its first test satellite, GIOVE-A, which began transmitting navigation signals in early January 2006. Since the launch, receiver developers around the world have been...more >>