a 3d explanation of the GPS system

[TechWeeklLeak1]

IN MY CASE YOU NEED AT LEAST 4 SATELLITES TO PERFORM RTK OPERATION. THIS WILL GIVE 3D POSITION FIX.

[gjrkayakero]

MUY MALA E INEXACTA "EXPLICACION"

[flouger]

You need 3 satellites to solve for x, y, z assuming that you know the transit times for each satellite(time from satellite to you).

The transmit time is going to be biased by some unknown amount. This bias will be the same across all the transit times.

If this bias was off by 1ms this would be an error of 300km. (1e-3*3e8)

4th sattelite is used to solve for this 4th unknown.

x,y,z, timebias. 4 unknowns, 4 satellites, 4 equations.

it doesn't work using circles.

[bestamerica]

'

what country make this 3 GPS satellites

[frcz10]

GPS doesnt work like that at all!!

[flerchjj]

satellites also look and move nothing like that

[ViscousDamping]

"Using messages received from a minimum of four visible satellites, a GPS receiver is able to determine the times sent and then the satellite positions corresponding to these times sent."

[pasham123]

bro in real life u need 4 sat. for actual loc.

[ryans523]

@pasham123 Incorrect, you need 4 spheres, 3 satellites providing 3 spheres, and earth acting as the 4th sphere

[pasham123]

@ryans523 at least my gps need 4 satellites :P

[joselu90]

That's worng!

[dhcpy]

Is it really that bad? I agree that satellites radiate spheres, but why bother drawing those, when with 4 spheres intersecting you may get the "point" in space?

2 spheres-->circle

3 spheres-->2 points

4 spheres--> actual location

The earth IS the 4rth sphere, so intersecting with the other 3 (from the satellites) does give 3 circles as in the video

[colmanian]

FOR PEOPLE WHO WISH THE UNDERSTAND GPS: The visual explanation is missleading. Each satelite emmits electromagnetic waves which emminate as a sphere (rather than the spotlight effect in the video). The crossing point of each sphere allows the position to be calculated in 3D space.

[HavokDelta6]

the cone is a representation of its accuracy, as it gets wider, the angle between the satalight and the spot on eatrh decreses, as a result acuracy EXPONENTUALLY decreses.

[darick04]

I just found something awesome to jack off to

[bmplefour]

As I have written many times space is one of the keys of the planet Earth. Not without superpower position in space. GPS, GALILEO, GLONAAS. How easy life you do what the GPS; How many jobs has created?

[perez041]

No explanation!

[NoiseLTD]

If I could, I would give this negative stars. Awful. If you use this to try to understand how GPS works, you'll know less after watching it than before.

[mmunrost]

Well I sure hope no-one uses this to explain GPS. It's totally wrong. Like one of the other comments, the signals are sent out in spheres and are not specifically targeted at the earth. It is stuff like this that leads to misconceptions.

[pantoffelhoofd]

rubbish, 3 is good!!!

[NoiseLTD]

If you know time with sufficient accuracy, three are satellites are enough. If you measure the direction to the satellite with sufficient accuracy, three satellites are enough, but measuring the direction to the satellite is generally impractical.

Some stationary GPS time standards can be set to remember their location, in which case only one satellite is needed to determine time.

GPS was designed to use four satellites, in general.

[bigwilly43729]

It not only has no explanation, but the trilaterion is off; the three circles don't intersect and it should have used spheres instead of circles anyway, to properly display the three-dimesional aspect of this.

[CamiloSanchez1979]

gay

[MikeDial]

In space there is no atmosphere. I guess that's why these satellites make no sound.

[AtomInfiltrators]

Who gave this two stars? It doesn't have any audio!

[ggwenlin]

how come there's no sound in this video? or explanation?

[MohammedBE]

because u can infer from the animation