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Thread: Phobos-Grunt - status updates

  1. #271
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    Quote Originally Posted by astromark View Post
    'NeoWatcher' The failing's of leaveing orbit and entering the programmed flight path..'Engines' did not ignite.
    Yes; I know that. I was verifying what Theville was refering to.

  2. #272
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    Disturbing
    http://gizmodo.com/5876942/russia-ac...mars-satellite
    http://www.popsci.com/technology/art...-grunt-debacle
    http://www.space.com/13790-russian-p...unishment.html

    I seem to remember hearing about how Russian space workers are forbidden from talking with rocket engineers in the US.
    http://www.space-travel.com/reports/...ravel_999.html

    The Russian space programs needs an influx of money badly--not more bashing

    More on the failure
    http://www.russianspaceweb.com/phobo...ntry.html#1_17
    Last edited by publiusr; 2012-Feb-24 at 11:13 PM.

  3. #273
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    The Soviet Union may be gone but its legacy will be with us for a good while yet. It's tough to erase 70 years (or should I say 500?) of this type of thinking in just over 20. Especially when the "new" leaders are carried over from the old regime.
    Last edited by Trebuchet; 2012-Jan-22 at 03:46 PM. Reason: Forgot last sentence.
    Cum catapultae proscriptae erunt tum soli proscript catapultas habebunt.

  4. #274
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    My biggest pet peeve is that many science journalists cannot tell the difference from these two words:

    "Earth orbit", referring to an object orbiting around the Earth

    "Earth's orbit", referring to the path that he Earth takes around the Sun

    I know it is permissible to use bad grammer and spelling in forums, but journalists should strive for a higher standard of proper english.

  5. #275
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    Quote Originally Posted by cjameshuff View Post
    The odds look heavily in favor of a software or hardware design or assembly fault.
    That's the latest idea in the blame game.
    Russia blames cosmic radiation for failure of Mars moon probe that fell to Earth
    Popovkin said that some microchips used on the craft were imported and possibly of inadequate quality to resist radiation. He did not specify where the chips were manufactured. [...] Popovkin said the craft’s builder, Moscow-based NPO Lavochkin, should have taken into account the possibility of radiation interfering with the operation and said Lavochkin officials would face punishment for the oversight.

  6. #276
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    It looks like some people still think an American radar might be the cause:

    http://www.spacedaily.com/reports/NA..._Test_999.html

    NASA has refused to participate in an experiment designed to show if U.S. radars could have had an impact on Russia's troubled Phobos-Grunt Mars probe, the deputy head of the country's space agency, Roscosmos, Anatoly Shylov said on Thursday.
    I may have many faults, but being wrong ain't one of them. - Jimmy Hoffa

  7. #277
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    Quote Originally Posted by Extravoice View Post
    It looks like some people still think an American radar might be the cause:
    That article is older news. It references the official report to be published "next week". Popovkin announced it's release today.

    I can't find any mention of Shylov in this thread, but back on post 211, there was a link to this story where Popovkin eluded to that idea sparked by a General's suspicion.

    So now that the report is released, I'd like to hear what Shylov has to say. And if any mention of the investigation request is in the report.

    I've been looking for any NASA references to any of the allegations, but can't find any.

  8. #278
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    Thanks for the clarification. There's nothing older than yesterday's news
    I may have many faults, but being wrong ain't one of them. - Jimmy Hoffa

  9. #279
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    The probability that a random cosmic ray cause a failure when the fault tree is unavoidably huge on a one-shot event is paultry. A cosmic ray could cause Labron James to miss a free-throw, too. What a pathologically lame excuse.

    Space is hard. There will be failures of complex systems...and delays...and cost overruns...
    “It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.” ― Arthur Conan Doyle, Sherlock Holmes

  10. #280
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    IEEE Spectrum has an interesting article discussing the Phobos-Grunt report:

    It sounds like they were either unlucky and two chips died from radiation in short-order, or there was a software error.

    Some highlights IMHO:
    The probe died so suddenly that it didn’t even send an error message, but investigators concluded the only plausible failure mechanism was the simultaneous disabling of two identical chips in the dual-computer control system, causing both to restart simultaneously.
    Because the failures happened in such a short time frame, McClure suspects that Phobos-Grunt was done in by software.
    but...
    [T]he WS512K32, which is a single-package assembly of SRAM totaling 512 kilobytes...were identified..a few years ago as some of the most sensitive parts to single-event latch-up they had ever seen
    To add salt to the wound...
    Phobos-Grunt was supposed to await further instructions from Earth, but it never received them; in an incredible design oversight, the probe could receive emergency instructions only after a successful departure from parking orbit.

    Full article here:
    http://spectrum.ieee.org/aerospace/s...s-mars-probe/0
    I may have many faults, but being wrong ain't one of them. - Jimmy Hoffa

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