The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

No audio available for this content. Why are the two GPS Transmitter frequencies (1575.42 and 1227.6 MHz) coherently selected integer multiples of 10.23 MHz master clock? The document defining the GPS ...

The global positioning system (GPS) constellation comprises 24 or more satellites in six orbital planes at an altitude of approximately 12,550 miles. Synchronized with on-board atomic clocks, the ...

LightSquared, a Virginia-based company that plans to build a nationwide wireless broadband network, is proposing to adapt its network so as not to interfere with GPS systems. The company plans to move ...

It’s illegal to own or operate a GPS jammer in the United States for many valid reasons. More importantly, it threatens many systems us humans find relevant. If GPS goes down, how will people get ...

ARE WE THERE? In a multi-GNSS world, that is. We’ve asked that question from time to time in this column over the years. So, are we there yet? That depends. One definition of “multi” is more than one.

Have you ever sent your location to somebody and then realized you’re a few buildings away from the marker on the map? Well, that’s exactly what Xiaomi aims to fix with dual frequency GPS receivers on ...

The argument raging over LightSquared’s proposed LTE network and possible interference with GPS services is actually two arguments over two sets of frequencies, both of which the startup hopes ...

Losing GPS would mean losing a lot more than Google Maps. The technology is integrated into everything from lights that turn ...

A new congressionally mandated report from the National Academies of Sciences, Engineering, and Medicine assesses the likelihood of harmful interference from Ligado Networks’ authorized use of the ...

While we pegged the Xiaomi Mi 8 as a contentious smartphone for its aesthetic design, the handset’s internals are far more interesting. It’s not just that the phone’s hardware brings a lot of value to ...