Leon Lobo is the head of the National Timing Centre research and development programme at the National Physical Laboratory, Teddington, UK. Chander Velu is professor of innovation and economics at the ...

pilots. Others are more automated and rely on the ability of ships to monitor themselves. 24 In both cases, GPS and DGPS are used to provide accurate positioning information that is integrated with ...

The pilots flying into Denver International Airport could tell something was wrong. In urgent calls to air traffic controllers, they reported that the Global Positioning System they used to navigate ...

The Global Positioning System, or GPS, is used by millions of people around the world every day for everything from directions to delivery tracking. But do you ever wonder how GPS works or, more ...

provide some protection against interfering signals. Although quantitative measures of resistance to RF interference, such as jammer-to-signal ratio (J/S) measured in decibels (dB) do exist, these ...