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

[TheMetube1965]

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

[JJTatz]

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

[MrDaldagnuur]

i wish i was in that rocket.

[muhammed12236]

الفيديو بطيء جدا

[DrZoid99]

USA! USA!

[Neueregel]

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

[anisocoro]

i think that soon there will be need of such a satellite as combat auxilium for USA troops against old enemies

[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.

[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?

[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

[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.

[columbo255]

So, at 3:39 the lady says "We will have first and second stage separation and second stage ignition." Does the second stage separate then ignite?

Oh, and it's the Air Force's work that everybody benefits from. Even if the Army uses it most.

[anisocoro]

It referred to separation OF first stadium FROM second, because there has been a previous separation of boosters (stadium 0) from stadium 1

[artwleb]

@columbo255 the second stage is inside the walls of the Delta II so it does separate before ignition.

[vanwahlgren]

Thank You US Army! the whole world benefits from your works!

[sranelson]

Actually, GPS is launch by the US Air Force, namely the 19th Space Operations Squadron.

[vanwahlgren]

This is true but the real user is US Army. The Air Corps uses it for some navigation and to help with placement of munitions for the Soldiers, but the Army is the one who uses it in combat.

[gtq838]

@vanwahlgren air force designed for air force use specifically to guide missles all other uses are after the fact.

[CadetNewman]

19 SOPS helps with launch and early orbit, 2 SOPS does C2 for the satellites