GPS capabilities can be protected against high power jamming sources to make them unjammable or practical purposes. Accuracy can be, simultaneously, improved. GPS III satellites are unnecessary and provide too little improvement over current … [Read more...] about Protection of U. S. PNT Capabilities – No New GPS Satellites, Please! *
PNT
Assured Position, Navigation, and Timing for the United States
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
Obama’s Flawed WMD Agreements
Recent reports of chemical weapons taken from Syrian military bases by al Qaeda groups, ISIS and the al Nusra Front should highlight the flaws of Obama's Iran deal. On August 18, 2014, Obama marked “an important achievement in our ongoing effort to … [Read more...] about Obama’s Flawed WMD Agreements
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
Weekly Briefing – March 16-20, 2015
“Anti-Semitism is a Huge Menace” – The Netherlands Chief Rabbi - Emerson Vermaat, Exclusive to ACD - “The growing wave of anti-Semitism in Holland forces Jews to be careful and hide any symbol that would give away their identity.” “I don’t think … [Read more...] about Weekly Briefing – March 16-20, 2015