Launch of the GPS IIR-18 Satellite Dec 21, 2007

United Launch Alliance successfully launched a Delta II expendable launch vehicle today from Space Launch Complex 17-A,Kennedy Space Centre, Florida, at 3:04 p.m., EST carrying the Air Force's GPS IIR-18(M) satellite.
Designed to operate for 10 years, GPS satellites orbit the Earth every 12 hours, emitting continuous navigation signals. With the proper equipment, users can receive these signals to calculate time, location and velocity. In addition to its military use, GPS satellites provide directional assistance to civilian users around the world.

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• rocket
• launch
• gps
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• florida

[TheMetube1965]

Is this different from the GPS used by civilian navigators. I have one and wonder who provided the gps signal.....

[gtq838]

@JJTatz gps is not operated by the coast guard. It is owned and operated by the US department of defense which deligates the operation to us air force space command. the systems was created for pilot navigation for the airforce and later implemented into nearly every guidence system. Yes the do encrypt signal and they do so all the time 24/7/365 civilian and military signals are very different.

[JJTatz]

And you don't need 4. 3 for location, 4 for location and height.

[JJTatz]

@gtq838 Some errors with your statement. GPS is run by Coast Guard, not military per se. Yes, they can deny signal in some geographic areas. And no - they don't deny it by encypting. There is an unencrypted signal that's always present - unless it's not being transmitted to a geographic area. Same goes for encrypted. They don't "start encrypting". And there is no selective availability in use for civilian GPS. It's almost every bit as accurate as military now. With WAAS it's sub-cm accuracy

[MrDaldagnuur]

i wish i was in that rocket.

[fivedragon53]

@gtq838 hello, i know how gps sattelite work. But I have some question, is 24 gps sattelite constellation is all owned by US government? Is there any country who have their own gps sattelites? Is there any places which not get scanned by those 4 satellites above them?

[muhammed12236]

الفيديو بطيء جدا

[DrZoid99]

USA! USA!

[Neueregel]

Thanks for this!! I catch signal from #18 right now in my yard

[gtq838]

@anisocoro what are you talking about? first of all you need a minimum of 4 of these for it to even work. second the united states military operates these. they can shut off civilian and foreign government use of the current ones any times they please simply by encrypting the current signal... they actually already do that with the main signal your tomtom uses a crappy signal compared to the military band.