There was once a time when your ancestors looked to the night sky to determine their location. Back then we used a Thomas guide, remember? Nowadays, all it takes is one magical technology to get directions, send your picnic spot to a lost friend, or track how far you've gone during a workout. That technology is called GPS, and you're about to discover the secret behind it.

Did you know that GPS was actually a military invention? The highest quality signals were used only for military purposes until May 2000, when they became available free of charge to all citizens. Now GPS is literally everywhere, and you can now even buy GPS insoles to keep an eye on your children or family members with Alzheimer's.

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TIMESTAMPS:
A brief history of GPS 0:29
How does it work? 1:35
2D and 3D trilateration 2:56
Performing the Calculations 5:21
And here's a bonus 8:05

#GPS #inventions #brightside

Music by Epidemic Sound https://www.epidemicsound.com/

RESUME:
– Simply put, GPS is a system consisting of three basic parts: satellites, ground stations and receivers.
– Ground stations use radars to find out if the satellites are actually where they are supposed to be.
– The GPS system has 32 active satellites orbiting the Earth. 24 of them are nuclear satellites, and the rest serve as emergency replacements if something happens to the others.
– A receiver on Earth must see at least 4 satellites to calculate an accurate location because the GPS uses a trilateration mechanism.
– 2D trilateration involves calculating the latitude and longitude on a map.
– When it comes to 3D trilateration, it's basically the same, but there will be spheres instead of circles on your drawing. The 3D position includes your latitude, longitude and altitude.
– GPS satellites send information about their position and current time to a GPS receiver at certain intervals. The receiver receives the information in the form of a signal.
– GPS satellites have atomic clocks that keep the most accurate time, but it would be impossible to install these clocks in every receiver.
– The atomic clocks of satellites are 38 microseconds ahead of the ground clocks every day. If scientists did nothing about it, GPS locations would deviate by 6 miles every day.
– There is also a GPS almanac in the receiver that keeps track of where this or that satellite should be at any time.
– GPS not only determines the most accurate location of people and objects, but also transmits time signals accurate to within 10 billionths of a second.
– Although incredibly accurate and useful, GPS sometimes takes people to unexpected places, especially in rural areas.

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