Author Topic: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018  (Read 47987 times)

Offline Ragmar

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET May 2018
« Reply #120 on: 12/06/2017 08:43 PM »
Here is a whole slide deck from September that contains the page Beidou posted.  It gives some more schedule details, but I found the parts about the software readiness confusing (one part says April 2019 but I'm not sure if that is needed for launch?)  The dates given for ILC are Q2-2018 for SV01 and Q4-2018 for SV02.
There are two software systems in the ground segment; the software readiness requires development in both systems.

The current system is the Operational Control Segment Architecture Evolution Plan (AEP) from Lockheed Martin.  The new system is the Next Generation Operational Control System (OCX) from Raytheon.  As originally designed, AEP had no ability to control GPS IIIA, and OCX had no ability to control GPS IIA.  OCX is very late and over budget, and is among the top acquisition disasters in recent history.

As a result, the ground segment plan has been revised as follows:
OCX Block 0 provides launch and checkout only for GPS IIIA.  USAF accepted OCX Block 0 earlier this month.
AEP Contingency Operations (COps) gives AEP the ability to control GPS IIIA.  This is due to come on line in 2019.
AEP M-Code Early Use (MCEU), planned for 2020, enables the military M-code signal.
OCX Block 1&2 gives OCX the ability to control the GPS constellation operationally, and will allow AEP to be retired.  This is scheduled for 2022.

OCX Block 0 is needed for launch.  COps is needed to add GPS IIIA to the operational constellation. 

http://www.losangeles.af.mil/News/Article-Display/Article/1361778/air-force-accepts-delivery-of-gps-next-generation-operational-control-system/

This is helpful.

So will they launch it (with OCX ready) in May?  Or will they wait till COps is ready to launch it?

Offline gongora

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET May 2018
« Reply #121 on: 12/12/2017 10:33 PM »
SpaceX will be launching GPS III-1 NET May 2018 instead of GPS III-2.  I'll get these threads sorted out at some point tonight.

GAO: GLOBAL POSITIONING SYSTEM (Dec. 12, 2017)

Quote
Independent of OCX development, the Air Force moved the first GPS III target launch date from March to May 2018 in the spring of 2017. According to Air Force officials, the change was the result of a decision to launch the first GPS III satellite on a Falcon 9 rocket, rather than a Delta IV.

edit: I found the GAO report via a tweet from Marcia Smith
« Last Edit: 12/12/2017 11:53 PM by gongora »

Offline gongora

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET May 2018
« Reply #122 on: 12/12/2017 10:43 PM »
From the GAO report:
Quote
The first GPS III satellite is projected to complete operational testing of legacy signal capabilities in September 2019. By that point, the Air Force plans to have launched 3 of the 10 GPS III satellites
...
 there are seven GPS III satellites planned to be launched by June 2021.
« Last Edit: 12/12/2017 10:43 PM by gongora »

Offline gongora

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET May 2018
« Reply #123 on: 12/12/2017 11:11 PM »
I merged the GPS III-1 thread from the ULA section and the GPS III-2 thread from the SpaceX section, there weren't really that many posts specific to ULA or the GPS III-2 satellite.  We can split out any GPS III-2 specific posts later (I'm not even sure who is going to launch it.)
« Last Edit: 12/12/2017 11:41 PM by gongora »

Offline zubenelgenubi

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET May 2018
« Reply #124 on: 12/12/2017 11:48 PM »
Re: launch swap

It will be interesting to see which ULA make/model will be retired 1st, 2nd, and last in 2018/9:
Delta II (ICESat-2),
Delta IV-M with 4-meter DCSS (GPS III-2),
or Delta IV-M with 5-meter DCSS (WGS-10).
« Last Edit: 12/12/2017 11:50 PM by zubenelgenubi »
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Offline gongora

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018
« Reply #125 on: 02/09/2018 02:59 AM »
From SpaceflightNow launch schedule:
Quote
The third GPS 3-series satellite will now launch on a Delta 4.
  GPS III-1 NET September

Offline AJW

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018
« Reply #126 on: 02/14/2018 03:41 PM »
I think that last sentence is an error on the Spaceflight now site and the switch was from Delta IV to F9.   Here's the full quote,

"A SpaceX Falcon 9 rocket will launch the U.S. Air Force’s first third-generation navigation satellite for the Global Positioning System. Delayed from May 3 and late 2017. Switched from a United Launch Alliance Delta 4 rocket. The third GPS 3-series satellite will now launch on a Delta 4. [Feb. 8]"

The last two sentences are incongruous.  If you look at the 'Latest Changes' section for Feb 8  you will see "Switching GPS 3-01 from Delta 4 to Falcon 9"

Offline gongora

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018
« Reply #127 on: 02/14/2018 03:49 PM »
I think that last sentence is an error on the Spaceflight now site and the switch was from Delta IV to F9.   Here's the full quote,

"A SpaceX Falcon 9 rocket will launch the U.S. Air Force’s first third-generation navigation satellite for the Global Positioning System. Delayed from May 3 and late 2017. Switched from a United Launch Alliance Delta 4 rocket. The third GPS 3-series satellite will now launch on a Delta 4. [Feb. 8]"

The last two sentences are incongruous.  If you look at the 'Latest Changes' section for Feb 8  you will see "Switching GPS 3-01 from Delta 4 to Falcon 9"

I don't quite understand what you're saying.  Three launch contracts have been awarded for GPS III satellites, one of them (previously the first flight) on Delta IV and the other two on Falcon 9.  The first flight was switched onto Falcon 9, but there has been no additional contract for SpaceX.  That would mean they just changed the order of the launchers.  Spaceflight Now is saying the order is now Falcon 9 -> Falcon 9 -> Delta IV

Offline pb2000

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018
« Reply #128 on: 02/14/2018 03:53 PM »
It's worded funny, but I think flight 1 and flight 3 are just swapping launch vehicles (or some other merry-go-round arrangement).
Launches attended: Worldview-4 (Atlas V 401), Iridium NEXT Flight 1 (Falcon 9 FT), PAZ+Starlink (Falcon 9 FT)

Offline AJW

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018
« Reply #129 on: 02/14/2018 03:56 PM »
Thanks for the clarification...  I was reading it as a swap from DIV to F9, not a change in flight order.

Offline gongora

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018
« Reply #130 on: 03/20/2018 06:22 PM »
[Spaceflight Now] U.S. Air Force divides new launch contracts between SpaceX, ULA
Quote
With the latest contract awards, SpaceX Falcon 9 rockets are slated to launch five of the Air Force’s first six new GPS 3-series navigation satellites, beginning as soon as September with the launch of the GPS 3-1 spacecraft. The second GPS 3 satellite is set for launch on a Falcon 9 booster no earlier than March 2019, followed by the launch of the GPS 3-3 satellite later next year on a ULA Delta 4 rocket.

Offline gongora

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Re: SpaceX Falcon 9 : GPS III-1 : SLC-40 : NET September 2018
« Reply #131 on: 03/24/2018 03:10 PM »
[Via Satellite] Raytheon Enters Final Phase of GPS OCX Software Build
Quote
“Our team has two primary goals this year,” said Dave Wajsgras, president of Raytheon Intelligence, Information and Services. “We will support the U.S. Air Force’s GPS 3 launch this fall and complete the software build for the full operational system by year’s end.”
Quote
Once complete, the team will begin integration and testing to keep the program on track for full system delivery in June 2021.

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