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#100
by
butters
on 23 May, 2010 02:51
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For how long does Delta own the range?
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#101
by
Antares
on 23 May, 2010 04:25
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Until the Shuttle tries to land. NET 5/26. So the 24th is clear. Then NASA and USAF would get together to decide if there's really a chance to land the Shuttle on 5/26. If not, Delta would get 5/25. And so on. Not sure if SpaceX has the Range after Shuttle or not.
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#102
by
ChrisGebhardt
on 23 May, 2010 04:52
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Until the Shuttle tries to land. NET 5/26. So the 24th is clear. Then NASA and USAF would get together to decide if there's really a chance to land the Shuttle on 5/26. If not, Delta would get 5/25. And so on. Not sure if SpaceX has the Range after Shuttle or not.
Range requires 36-48 hours to reconfigure between vehicles. Delta on 5/24 would be ~2300 EDT with Atlantis coming home 0848 EDT 5/26. That's 34-hours. Therefore, 5/24 may NOT be a possibility for Delta.
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#103
by
Jim
on 23 May, 2010 12:56
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Landings are not the same as launches and require much less range resources.
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#104
by
WHAP
on 23 May, 2010 13:10
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Landings are not the same as launches and require much less range resources.
That may be true, but the Range still required 48 hours between the last Shuttle landing and the Atlas OTV launch. Once upon a time, it was only 24 hours.
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#105
by
HIPAR
on 23 May, 2010 18:01
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I guess they got the telemetry fixed. The rocket is still standing outside. If they found a major problem with the GPS satellite I'd assume the service structure would have been moved back around the the rocket.
I'm curious about what went wrong. Assuming they monitor the radio data link:
a) The satellite transmitter somehow shut off
b) Ground station equipment failure or setup problem
c) An obstruction moved into the beam
d) Radio interference
I've seen references to RF interference signals holding back launches.
--- CHAS
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#106
by
Jim
on 23 May, 2010 19:36
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I guess they got the telemetry fixed. The rocket is still standing outside. If they found a major problem with the GPS satellite I'd assume the service structure would have been moved back around the the rocket.
I'm curious about what went wrong. Assuming they monitor the radio data link:
a) The satellite transmitter somehow shut off
b) Ground station equipment failure or setup problem
c) An obstruction moved into the beam
d) Radio interference
I've seen references to RF interference signals holding back launches.
Spacecraft use ground links while on the pad. The RF is for during flight.
Power, commanding and telemetry are providing to the spacecraft through electrical connectors called inflight disconnects or spacecraft umbilicals which are mounted on the payload adapter or draped from the fairing. The wiring for these connectors comes from a panel on the upperstage which is connected to an liftoff umbilical on the outside of the launch vehicle. The wiring runs down the umbilical tower to a room at the base of the pad. The tower wiring is connected to spacecraft EGSE racks (power and comm) in this room. The racks communicate to the spacecraft control center over range provided fiber and copper comm circuits.
So here are some of the links and nodes
Spacecraft inflight disconnects
launch vehicle mission unique wiring to standard electrical interface panel
launch vehicle standard wiring to LV umbilical
Umbilical tower wiring
tower interface panel
spacecraft EGSE to tower panel wiring
spacecraft EGSE to pad/range interface wiring
now there are multiple circuits in the range, most ending up going through the XY building and then out.
The range circuits then arrive at the spacecraft control center facility, which could be on the Cape, KSC or ASO. There may be other nodes in between or less depending on the location. (NASA missions goes through Hangar AE or there are some direct circuits to ASO)
The spacecraft control center facility may have a central comm room and a specific mission circuits are then routed to the spacecraft control center room node.
The spacecraft control center EGSE is connected to this node
With the advent of ethernet and fiber circuits, comm with the control centers are no longer RF.
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#107
by
Antares
on 23 May, 2010 19:52
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Range requires 36-48 hours to reconfigure between vehicles. Delta on 5/24 would be ~2300 EDT with Atlantis coming home 0848 EDT 5/26. That's 34-hours. Therefore, 5/24 may NOT be a possibility for Delta.
Sigh. 30 hours is the stated requirement for this one.
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#108
by
Jim
on 23 May, 2010 21:10
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Scrubbed for Sunday
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#109
by
sdsds
on 23 May, 2010 21:22
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On the count Friday night where T-0 was at the close of the window they preceded past the point where they had held when T-0 was at the opening of the window. That is, the response during the second launch conductor's poll was "go". Did that mean that had regained contact with the spacecraft, or at that point were they relying on the launch director to call "hold" at the last moment?
Re: "Scrubbed for Sunday"
Sigh.
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#110
by
WHAP
on 23 May, 2010 21:41
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Typically, if it's the latter, you'll hear some discussion about proceeding with a known issue. It's been done before, for instances where weather is expected to clear, or other situations that might be fixed in time. I don't know what the circumstances were on this one.
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#111
by
Chris Bergin
on 23 May, 2010 23:34
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So much for getting a nap in beforehand...
Delta IV GPS IIF SV-1 Mission Scrubbed for May 23
Cape Canaveral AFS, Fla. (May 23, 2010) - The launch attempt of the United Launch Alliance Delta IV with the Air Force’s Global Positioning System IIF SV-1 satellite (GPS IIF SV-1) has been scrubbed for tonight. Mission managers require additional time to validate the modified approach to monitor the Global Positioning System satellite telemetry signal.
The Delta IV rocket and GPS IIF SV-1 satellite are safe and secure at this time. The next launch attempt has been set for Monday with a launch window of 11:13-11:31 p.m. EDT. The weather forecast calls for an 80 percent chance of acceptable weather during the launch window.
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#112
by
Chris Bergin
on 24 May, 2010 18:49
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Anyone Cape side hearing if this is looking good tonight?
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#113
by
Chris Bergin
on 24 May, 2010 19:08
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ULA have just sent out a media statement saying all is "GO" for tonight. Woo!
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#114
by
HIPAR
on 24 May, 2010 19:35
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What are the oddsmakers in Vegas saying about a 'Go' tonight?
--- CHAS
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#115
by
Satori
on 24 May, 2010 21:05
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From the NASA ELV page...
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#116
by
Satori
on 24 May, 2010 21:20
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#117
by
HIPAR
on 24 May, 2010 22:03
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According to the ULA mission booklet, GPS IIF-1 will be released to its operational orbit somewhere over the South China Sea with spacecraft separation occurring at about 3 AM. It is going into Plane B transmitting PRN25.
I fast forwarded my satellite tracking to that time. Apparently, the new satellite will orbit close to the GPS Space Vehicle 49 launched last March. That satellite hasn't been set usable because it exhibits an antenna pattern anomaly.
---CHAS
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#118
by
Satori
on 25 May, 2010 00:14
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#119
by
Satori
on 25 May, 2010 00:22
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