GPS and other satellites
I've asked this question a few times in the politics server but i've never received a response. How would GPS signals work if not for orbiting around the earth? The only response to this i've heard is that they are actually ground stations however that doesn't explain the following things:
1. The doppler effect you see from satellites proves they are moving
2. You can actually prove the speed of the satellite by using the shift mentioned above
3. The propagation delay of GPS satellites (67-68ms * speed of light) is equal to the orbit of the satellite
4. You can actually use directional antennas (i've done so for NOAA and starlink satellites) and trace them across the sky, indicating that it can't be a ground station
I did hear someone once say it was airplanes, however GPS RTK is accurate up to 1cm, sometimes even more accurate/ for this to be the case, an airplane would have to follow a centimetre accurate path, any mistake and it wouldn't work. Not to mention the refuelling required to have planes up there 24/7.
7 Replies
GPS Is nothing more than triangulation between ground towers
And you have systems that pre-date GPS that work just as well, i don't remember the name
Radiowaves signal propagation Is line of sight for thousands of Miles and they don't take into account any curve, ever
And satellites don't matter
They use a geocentric coordinate system and equations admittedly
Even pretending they are what they tell us, they actually prove that the Earth doesn't move
You can put stuff in the Sky above a flat surface
The coordinate systems assume a flat non-rotating earth. Name the coordinate system and it'll have a fundamental plane. Start there
Otherwise all your claims following the underlying assumptions of a FE still give you and require a FE.
GPS receivers deliver local tangent plane coordinates to the user. Mathematics chain these planes together for all receivers into a sphere. But how many planar surfaces would you need to make a sphere?