Absolute coordinate system of GPS satellites

Saint

Saint

Valued Senior Member
What is the absolute coordinate system of GPS satellites?
Is it the center of the earth?
 
That is determined by scientists and you think scientists are liars so it the answer is irrelevant.
 
Saint said:
What is the absolute coordinate system of GPS satellites?
Is it the center of the earth?
Click to expand...
Fairly certain not centre of Earth

I know London, guess most other large cities, have nominal centres, London being

The coordinates of the nominal centre of London, traditionally considered to be the original Eleanor Cross at Charing Cross near the junction of Trafalgar Square and Whitehall, are about 51°30′26″N 00°07′39″W.

https://en.m.wikipedia.org/wiki/London

Also a plaque may mark the centre from which distances can be calculated to other parts of the city

https://gssc.esa.int/navipedia/index.php/Satellite_Coordinates

This link provides some details about satellite coordinates

The app I have in my phone requires 3 satellites to be in view before it will locate within a few metres my house

Uber makes good use of the system showing me the car which has accepted my request, shows on a roadmap where the car is and tracks its travel

:)
 
Saint said:
After major earthquake, will the plate coordinates be shifted?
Click to expand...
Possibly.

How do you think that the average rate of continental drift is determined for the various tectonic plates?
 
None of the coordinate systems mentioned are absolute.
If center of Earth is used, then it is relative to that accelerating coordinate system, not absolute. Earth is hardly an inertial object.

No, I am personally unfamiliar with the details of programming of GPS and what coordinate system might be used for the computations.
Center of Earth seems a reasonable choice in my opinion.
 
Saint said:
What is the absolute coordinate system of GPS satellites?
Is it the center of the earth?
Click to expand...
It's the system of longitude and latitude established long ago with Greenwich, London at its center. This position system is coordinated with satellites using more than 8 tracking stations around the world, who's locations have been precisely established using other methods.

While a single tracking station could move due to plate tectonics, it's role would just be removed temporarily until it's new location was established.
 
Saint said:
if one or two of the satellites break down, what will happen?
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There are 9 satellites held in reserve. If a
satellite fails, one of them will take up the slack. A new satellite will be launched in order to get the number of reserve satellites back up to 9.
 
Saint said:
which country pays for the satellite cost?
Click to expand...
It's primarily a US system. There is a separate Russian system, and the data can be combined for greater accuracy. Satellites are regularly taken off line until their positions can be corrected.
 
Do the satellites have commercial values to make money by providing services to broadcasting companies?
 
Saint said:
Do the satellites have commercial values to make money by providing services to broadcasting companies?
Click to expand...
GPS satellites, which orbit with periods of 12 hours would not make good communication satellites. Those orbit at geosnyc altitudes, which are a good deal higher.
 
GPS is a free service provided by the US government to help general commerce. Also there are military applications.
 
Please post on topic
spidergoat said:
GPS is a free service provided by the US government to help general commerce. Also there are military applications.
Click to expand...
And now some state governments demand that home healthcare workers acquire GPS tracking applications on their phones so they can track the healthcare provider's movements during the day. You log in when you arrive at your client and activate your GPS tracking, and the government now can track every move you make and the required on-line progress notes and match that information to your paper billing hours. This time-consuming activity is not compensated and basically reduces the hours spent on hands-on care. Something is wrong here!

For most home health workers this involves buying a new expensive phone with GPS tracking abilities and learn to sign in to a tracking center that compiles your every movement, and in effect forces you to spy on yourself.

I have several questions related to the legality of having to pay a fee to work and transmitting private health care information over an unsecured internet. AFAIK, these practices are both prohibited by law.

Any knowledgeable minds out there?
 
Write4U said:
And now some state governments demand that home healthcare workers acquire GPS tracking applications on their phones so they can track the healthcare provider's movements during the day. You log in when you arrive at your client and activate your GPS tracking, and the government now can track every move you make and the required on-line progress notes and match that information to your paper billing hours. This time-consuming activity is not compensated and basically reduces the hours spent on hands-on care. Something is wrong here!

For most home health workers this involves buying a new expensive phone with GPS tracking abilities and learn to sign in to a tracking center that compiles your every movement, and in effect forces you to spy on yourself.

I have several questions related to the legality of having to pay a fee to work and transmitting private health care information over an unsecured internet. AFAIK, these practices are both prohibited by law.

Any knowledgeable minds out there?
Click to expand...
Reported for thread hijacking.
 
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