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
Communications
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
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