a 3d explanation of the GPS system
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IN MY CASE YOU NEED AT LEAST 4 SATELLITES TO PERFORM RTK OPERATION. THIS WILL GIVE 3D POSITION FIX.
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MUY MALA E INEXACTA "EXPLICACION"
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what country make this 3 GPS satellites
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GPS doesnt work like that at all!!
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satellites also look and move nothing like that
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"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."
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@ryans523 at least my gps need 4 satellites :P
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@pasham123 Incorrect, you need 4 spheres, 3 satellites providing 3 spheres, and earth acting as the 4th sphere
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bro in real life u need 4 sat. for actual loc.
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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.
colmanian 2 years ago 12
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.
flouger 1 year ago 3