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 ...

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 ...

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 ...

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 ...

FIGURE 1. Low-cost single-frequency receivers collecting GPS+BDS data for single-baseline RTK, with patch antennas (left) and survey-grade antennas (right) on Jan. 4–6 and Jan. 6–8, 2016, respectively ...

I was considering posting this in the Lounge, but I'm actually looking for a scientifically accurate answer here, or at least one from someone who is well-informed. I have two "hockey puck" GPS ...

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 ...

Almost half a century ago, the US Department of Defense started working on an experimental project to launch a series of satellites into space to make it possible to pinpoint any location on Earth.