GPS Satellites help???????

Question

Choose from the list of options below the two statements that are true.

A GPS stands for Global Positioning Satellites.
B GPS satellites contain highly accurate atomic clocks.
C GPS satellites transmit at a speed of 2 × 108 m s-1.
D GPS satellites are used to track the location of vehicles.
E GPS receivers use triangulation to find an accurate location.
F GPS satellites are in geostationary orbits around Earth.

Answer 1

A) No, it's Global Positioning *SYSTEM*

B) Yes they do

C) They transmit at the speed of light which is roughly 2x10^8 m/s

D) GPS receivers track the location of vehicles. The satellites just transmit a signal.

E) Yes, they use a form of triangulation

F) No



So B, C, and E.

Answer 2

A - No it's System not Satellites

B - Yes

C - No, it's the speed of light which is 3 * 10^8 m/s

D - Not directly. A GPS receiver can track the satellites and calculate it's location. Some receivers can report that location over the internet and so be tracked. So if you put the correct type of GPS on a truck you can track the truck but the GPS satellites themselves aren't tracking the truck.

E - Almost. They use trilateration not triangulation. You're measuring distances not angles.

F - No, they are a lot closer than that and have a ground track repeat of almost exactly 12 hours.





If the question claims that two of these are correct then the answers sheet is going to say that B and E are the two true statements, the error in E is very commonly made.

Answer 3

C (just under 3 million m/s) and F (LEO orbit) are wrong. GPS does use a Geostationary satellite to transmit WAAS data though.



D is questionable. By itself, GPS does not track, but fundamentally just transmits the time and its location from satelites to the earth receivers. In concert with other systems it can track the location of the receiver, either by logging on the receiver, or a live with wholly separate radio system.

Answer 4

Just about everybody is wrong. GPS sats are not geostationary. They wouldn't work if they were since you get your position by how fast they're traveling toward or away from you, and their relative distances from you.

They're also not LEO by a longshot. They orbit about 12,000 miles up.

I have no idea what that transmission speed you posted means. The rf frequency is from 1175mhz to1575mhz with a data rate of a little over 1mhz.

They don't use triangulation in the traditional sense, but do it by measuring your distance, not direction, from several satellites.

They're used in tracking, but they don't do the tracking. That takes another communications system that transmits the coordinates the GPS receiver picked up.

Answer 5

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Answer 6

A should read "Global Positioning System"

B is correct

C,im not sure of your equation, but the transmitted speed is the speed of light taking 118 milliseconds to reach earth from geo staionary orbit

D, its not the vehicle they track, its the gps receiver, be it in your car or in your pocket (Like in a smart phone)

E, this is correct, the most i have found is 5 satellites at one time

F is correct

Answer 7

I would chose A,E and F.

Answer 8

a and f at a guess