Left: World map showing the location of GPS ground components It is shown that the issue associated with assuring Position, Navigation, and Timing is not one of building backup systems to augment the GPS, but, rather, one of designing and building … [Read more...] about Assured Position, Navigation, and Timing for the United States
eLoran
The U.S. Global Positioning System Needs Protection
The Global Positioning System (GPS) is the most important technology and capability ever developed and fielded by the military forces of the United States. Originally, conceived as an aid to weapon delivery and navigation for the military, the system … [Read more...] about The U.S. Global Positioning System Needs Protection
Universal Positioning, Navigation, and Timing: A System for the Future
Abstract The problems of the vulnerability of the Global Positioning System to jamming and interference and the inadequate performance of eLoran are addressed. A new system, which should satisfy national needs for decades into the future, is … [Read more...] about Universal Positioning, Navigation, and Timing: A System for the Future
GPS Vulnerability: Options and Alternatives
Abstract The Global Positioning System (GPS) was declared operational on December 8, 1993. Since that time the system and the receivers that use it have been improved to a level of performance unimagined by its creators. Also, the system has been … [Read more...] about GPS Vulnerability: Options and Alternatives
Weekly Review, June 8-13, 2015
It’s Getting Late in the Cyber War - Rachel Ehrenfeld - Promises to increase the United States cyber defenses are nothing new, though lately they are made more frequently. On June 9, 2015, just one day after President Obama vowed to “aggressively … [Read more...] about Weekly Review, June 8-13, 2015
Securing the GPS
Recently, there has been a considerable interest shown in the fact that the nation has become very dependent on the GPS signals and the capabilities that they enable. There have been many presentations by those who claim that GPS signals are weak … [Read more...] about Securing the GPS
eLoran and GPS
Foreward: "On May 22, 2015, the US Department of Homeland Security agreed with the Exelis and UrsaNav Corporations to put an eLoran signal (a terrestrial system) on the air for testing and demonstration." The vigorous advocacy of the Washington-based … [Read more...] about eLoran and GPS
A Navigation and Timing Primer: Concepts and Misconceptions
This paper attempts to establish a common base of terms and concepts related to navigation. It is intended to set the definitions and principles which will enable rational discussions of navigation issues, such as the search for alternatives to … [Read more...] about A Navigation and Timing Primer: Concepts and Misconceptions