[rlmorel]

BFL

[1Old Pro]

Now, everyone can find his location within seven feet anywhere on the globe.

Except the military, they can find their location within 7 microns.

[ProtectOurFreedom]

Thanks for posting this great article!

Can we find something common about Richard Schwartz, Bradford Parkinson, James Spilker, and Hugo Fruehauf as well as the many great men who went before them who made GPS possible? (Johannes Kepler, Gottfried Wilhelm Leibniz, Michael Faraday, James Clerk Maxwell, Max Planck, Albert Einstein and many others)

[Red Badger]

> In 12 millennia, the north pole will point towards the star Vega.<

And in 12 more millennia it will be back to Polaris................

[sonova]

.

[AlaskaErik]

The mid-19th century introduced sextants.

Try mid-18th century.

[Sequoyah101]

Imagine locating a sea floor penetration point for a well located nearly 200 miles off the coast of Nigeria in just over 9,000 feet of water to within a meter on the face of the earth. After that, imagine tracking the position of the drill bit with similar accuracy.

Just one of the problems is proving you did it. The other problem is proving you didn't.

The big question is why?

It was expensive.

[HeadOn]

“Sources of errors for this plan abounded. Among these included space-time dilation, revealed by Albert Einstein in 1905 and 1915. Due to special relativity, the NAVSTAR satellite’s orbital speed of 2.4 miles per second decelerates the clocks by seven microseconds per day.

By contrast, general relativity speeds up those same clocks by 45 microseconds per day due to the GPS satellite’s greater distance from the Earth’s core. That reduces that gravitational influence compared to the surface.”

PLEASE - Nobody ping the flat-earthers and the Moon-landing conspiracy guys - they think Einstein was a co-conspirator...

GPS is cool stuff. Once you get the platforms in place, it’s all about timing and geometry!

[threefinger]

"...A few days after the Soviet Union launched Sputnik a few hundred miles above the Earth’s surface, scientists at the Johns Hopkins Applied Physics Laboratory realized the satellite could be tracked from the ground merely by the radio signals its transmitters emitted by exploiting the Doppler shift as it passed.

In August 1966, the U.S. Air Force submitted proposal 621B to engage these principles in reverse: using the satellite to locate a ground position, such as for search-and-rescue operations....

There are NO SOLDIERS in the US Air Force.

[mabarker1]

I don’t remember the FReeper Screename but someone here posted a while back that Their Father was a part of the original GPS system creator’s.

[rusty millet]

Apparently no one was concerned about the lack of diversity, only making awesome stuff that works.

[CodeJockey]

I’m assuming this same technology is also used for calculating ground speed in real time too?