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SpaceX F9 - Starlink 0.9 - SLC-40

Discussion in 'SpaceX' started by ecarfan, Mar 13, 2019.

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  1. mongo

    mongo Well-Known Member

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    Hey, when you loaded the software on all the satellites, you did remember to increment Sat_ID each time, right?
     
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  2. bxr140

    bxr140 Active Member

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    It will be interesting if we actually learn space's architecture. IIRC, they had previously specified separate payload and T&C frequencies (happy for a fact check on my memory....); in those situations typically the T&C is significantly slower than the payload data rate because it doesn't need to be fast, and its typically at a frequency far enough away from the payload that there's no chance of any kind of interference.

    If SpaceX is using their payload as their T&C they would have to identify, separate, and route the signal internally within the bus instead of on to the next payload gizmo (the downlink antenna array or the ISLs). Certainly plausible, especially given the volume they're talking about. The big risk, of course, is that if your payload goes down you lose all commanding. Maybe ok given the volume, but there's definitely zero chance of interactive troubleshooting at that point.

    Either way, nothing beats a hard line between the engineer's computer and the satellites. So its understandable that they want to update FSW while on the ground. For me, the most curious thing is that they need to update the FSW [at this point in the game, for the 60 sats that are locked and loaded].
     
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  3. e-FTW

    e-FTW New electron smell

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    This makes me think of a dead man's switch: if you upload something that locks you out, and by a certain time you've not accessed it to disable the dead man's switch, it automatically reverts to known good state.
     
  4. bxr140

    bxr140 Active Member

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    Yes, there's definitely checks and balances to make sure the upload is uncorrupted (at the most basic level, its just a file exchange), and there's definitely checks and balances to make sure the new version is uncorrupted before dumping the old version (at the most basic level, its just like updating software on your devices).
     
  5. boonedocks

    boonedocks Active Member

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    T -5 hours

     
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  6. Grendal

    Grendal SpaceX Moderator

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    Correct weblink:
     
  7. N5329K

    N5329K Active Member

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    Outstanding launch and 1st stage recovery. Nice work, SpaceX.
    Robin
     
  8. ecarfan

    ecarfan Well-Known Member

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    Perfect mission so far, anxiously awaiting sat deployment! The view of the sat stack with the earth below is mind boggling!
     
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  9. TLej

    TLej Little-Known Member

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    Deployment was kind of anti-climactic, I would have liked an animation or something showing how the constellation spreads out from the initial blob.

    Unbelievable to think that first stage has now landed three times, and the rest of the world combined hasn't done it once yet.
     
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  10. ecarfan

    ecarfan Well-Known Member

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    It sure was. :oops: But all that matters is that it was successful according to the webcast host.
     
  11. ICUDoc

    ICUDoc Active Member

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    Never expected the sats to all fall off at once! So I guess they reach 550kms and a spread out constellation over, what, days? Weeks??
     
  12. Model 3

    Model 3 Active Member

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    #52 Model 3, May 23, 2019
    Last edited: May 23, 2019
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  13. dhanson865

    dhanson865 Active Member

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    #53 dhanson865, May 23, 2019
    Last edited: May 23, 2019
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  14. Electroman

    Electroman Well-Known Member

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    When these 60 satellites finally reach steady state, are these all expected to follow the same path (same inclination)? what would be the separation between them?
     
  15. oneday

    oneday Active Member

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    Yeah not exactly what I was expecting either. Definitely initiated the spin on an entire different axis than I thought. Even though it was anti climactic it still blows me away how SpaceX innovates. Cool time to be alive.
     
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  16. ICUDoc

    ICUDoc Active Member

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    Re: these new satellites
    Can we see them?
    Can we know where they are?
    When (if ever) will we be able to use them? Are these commercial or test -only?
     
  17. mongo

    mongo Well-Known Member

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    Yes, all in the same inclination (53 degrees), but maybe not in the same plane. Like Iridium, they could take advantage of precession to shift to multiple offset planes before finishing their maneuver to their final altitude and spacing.
    However, this doc https://fcc.report/IBFS/SAT-MOD-20181108-00083/1569860.pdf
    Calls out 66 sats each in 24 planes, so all 60 may stay in this planes and only the 6 additional/ spares will precess. 15 degree planes separation (at equator), 6ish degrees sat separation in plane.

    Doubt it
    Yes, satellite tracking sites will likely update with the constellation data
    These are real, end user sats. This launch lacks sat to sat comm links (laser or RF), so will function as ground to ground relays. Likely internal testing for now followed by a few main commercial customers, then general consumption.
     
  18. Electroman

    Electroman Well-Known Member

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    i am trying to grasp what that means. But again how many miles far away each one will be to the adjacent one in the same plane?
     
  19. Cosmacelf

    Cosmacelf Well-Known Member

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    Oh wow, no sat to sat links. Didn’t know that. SpaceX is really developing this network in real time aren’t they? I suspect they are finding or are going to find that station keeping for laser links is going to be tricky, not to mention Sun interference, etc.
     
  20. dhanson865

    dhanson865 Active Member

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    "All 60 Starlink satellites online, solar array deployment coming up soon" from twitter
    "Krypton ion thrusters activate in about 3 hours to raise orbit" and was posted about 30 minutes after deployment" from twitter

    So now they should be raising their orbits, dunno how many hours or days it'll take them to get into position but they are already sending and receiving data at this point. Nothing stopping them from being usable as they adjust their orbit.

    Said another way the sats come online and become a usable part of the network before they get into their assigned positions. So every time they launch another batch they add to the network rather quickly
     
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