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Spacecraft Set to Reach Milestone, Reports Technical Glitches
Guest_AlexBlackwell_*
post Feb 8 2007, 12:30 AM
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Spacecraft Set to Reach Milestone, Reports Technical Glitches
NASA/JPL
February 7, 2007
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stevesliva
post Feb 8 2007, 02:24 AM
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As a chip guy, I'll be interested to hear whether it's the CCDs or the FPGA look-up tables, or perhaps some memory. The chips that we make these days are not only extremely susceptible to soft errors, but have some pretty wacky methods of working differently as time goes by. You can differentiate mean-time-to-failure in large systems at sea level versus Denver...
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mcaplinger
post Feb 8 2007, 03:36 AM
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QUOTE (stevesliva @ Feb 7 2007, 06:24 PM) *
As a chip guy, I'll be interested to hear whether it's the CCDs or the FPGA look-up tables, or perhaps some memory.

From what little I've heard, the problem is almost certainly analog in nature, if not in the CCD output amplifiers then somewhere in the signal chain before digitization.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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Posts in this topic
- AlexBlackwell   Spacecraft Set to Reach Milestone, Reports Technical Glitches   Feb 8 2007, 12:30 AM
- - tuvas   QUOTE (AlexBlackwell @ Feb 7 2007, 05:30 ...   Feb 8 2007, 12:43 AM
- - stevesliva   As a chip guy, I'll be interested to hear whet...   Feb 8 2007, 02:24 AM
|- - mcaplinger   QUOTE (stevesliva @ Feb 7 2007, 06:24 PM)...   Feb 8 2007, 03:36 AM
|- - mchan   QUOTE (stevesliva @ Feb 7 2007, 06:24 PM)...   Feb 8 2007, 07:20 AM
|- - stevesliva   I don't mean to trivialize the attention that ...   Feb 8 2007, 02:46 PM
|- - mchan   QUOTE (stevesliva @ Feb 8 2007, 06:46 AM)...   Feb 9 2007, 06:09 AM
- - tuvas   The problem is analog in nature somewhere, if it w...   Feb 8 2007, 04:07 AM
- - PhilCo126   It looks like the great galactic ghoul is active i...   Feb 8 2007, 05:13 PM
- - Zvezdichko   Well, the problem doesn't impact the quality o...   Feb 8 2007, 05:28 PM
- - AlexBlackwell   Mars Reconnaissance Orbiter Glitch Disrupts Data F...   Feb 8 2007, 11:58 PM
|- - jamescanvin   QUOTE (AlexBlackwell @ Feb 9 2007, 10:58 ...   Feb 9 2007, 12:27 AM
|- - DataMiner   QUOTE (AlexBlackwell @ Feb 8 2007, 04:58 ...   Feb 9 2007, 01:15 AM
|- - GuyMac   QUOTE (AlexBlackwell @ Feb 8 2007, 04:58 ...   Feb 10 2007, 03:12 AM
- - centsworth_II   How many more images of the northern plains did yo...   Feb 9 2007, 12:12 AM
|- - djellison   QUOTE (centsworth_II @ Feb 9 2007, 12:12 ...   Feb 9 2007, 12:41 AM
- - AlexBlackwell   Mars Orbiter Imaging Halved By Craig Covault/Aviat...   Feb 9 2007, 01:10 AM
- - slinted   I'm having a hard time figuring out what the c...   Feb 11 2007, 11:55 PM
|- - mcaplinger   QUOTE (slinted @ Feb 11 2007, 03:55 PM) t...   Feb 12 2007, 01:40 AM
|- - tuvas   QUOTE (slinted @ Feb 11 2007, 04:55 PM) t...   Feb 12 2007, 02:23 PM
- - nprev   This is more than a bit disconcerting; now I'm...   Feb 12 2007, 03:54 AM
- - Sunspot   Well I hope they get a picture of the possible Bea...   Feb 12 2007, 03:10 PM
- - ugordan   Whoa... there are some black thoughts here, Sunspo...   Feb 12 2007, 03:17 PM
- - djellison   Why move them up the list? Even if HiRISE were kn...   Feb 12 2007, 03:23 PM
- - Analyst   Some questions to better understand the situation:...   Feb 12 2007, 03:46 PM
|- - mcaplinger   QUOTE (Analyst @ Feb 12 2007, 07:46 AM) t...   Feb 12 2007, 04:25 PM
|- - tuvas   QUOTE (mcaplinger @ Feb 12 2007, 09:25 AM...   Feb 12 2007, 09:12 PM
- - monitorlizard   mcaplinger, IIRC you are involved with the MRO CTX...   Feb 12 2007, 04:44 PM
|- - mcaplinger   QUOTE (monitorlizard @ Feb 12 2007, 08:44...   Feb 13 2007, 03:38 AM
- - vjkane2000   Can you confirm the Nature report that one of the ...   Feb 12 2007, 09:27 PM
- - slinted   Tuvas, thanks for the clarification. It's goo...   Feb 12 2007, 10:19 PM
- - vjkane2000   As a remote sensing scientist (although of things ...   Feb 12 2007, 11:25 PM
- - djellison   I think all the 'colour' strips of HiRISE ...   Feb 12 2007, 11:27 PM
- - slinted   I'm could certainly be wrong about this, heck ...   Feb 13 2007, 12:23 AM
|- - tuvas   QUOTE (slinted @ Feb 12 2007, 05:23 PM) I...   Feb 13 2007, 05:18 AM
- - JTN   New Scientist reports that HiRISE is currently ...   Mar 17 2007, 11:28 AM
- - monitorlizard   Does anyone know if HiRSE is going to continue tak...   Mar 21 2007, 03:02 AM
|- - tuvas   QUOTE (monitorlizard @ Mar 20 2007, 08:02...   Mar 21 2007, 03:04 AM
- - monitorlizard   Given the constantly increasing MRO data transmiss...   Mar 22 2007, 01:29 AM
|- - tuvas   QUOTE (monitorlizard @ Mar 21 2007, 06:29...   Mar 22 2007, 03:04 PM
- - monitorlizard   Thanks, tuvas. It's always nice to know what...   Mar 23 2007, 12:38 AM
- - nprev   Speaking of which, Tuvas, do you have the scoop on...   Mar 23 2007, 02:00 AM
|- - tuvas   QUOTE (nprev @ Mar 22 2007, 07:00 PM) Spe...   Mar 23 2007, 08:03 PM
- - OWW   http://www.azstarnet.com/allheadlines/174972   Mar 23 2007, 03:54 PM
- - Rakhir   This is the explanation from Spirit updates. Spir...   Mar 23 2007, 08:51 PM
- - nprev   Ah...I get it now, thanks, guys! Anybody els...   Mar 24 2007, 12:34 AM
- - Tom Tamlyn   If I remember correctly, the reason the two spacec...   Mar 24 2007, 12:06 PM
|- - Jim from NSF.com   QUOTE (Tom Tamlyn @ Mar 24 2007, 08:06 AM...   Mar 26 2007, 03:09 PM
- - djellison   MRO's a real spares-thief... MOI was done usin...   Mar 24 2007, 12:38 PM
|- - tuvas   It's got nothing on Phoenix though... But I no...   Mar 24 2007, 03:01 PM
- - djellison   Phoenix IS the spares cupboard Magellan did wel...   Mar 24 2007, 05:36 PM
|- - tedstryk   QUOTE (djellison @ Mar 24 2007, 05:36 PM)...   Mar 26 2007, 01:12 PM
- - elakdawalla   Agreed, we need those dish arrays for the DSN. Bu...   Mar 24 2007, 06:33 PM
- - nprev   Hmm. Well, they wouldn't be exactly the same.....   Mar 24 2007, 07:07 PM
- - djellison   Oh - same freq, same patch of sky - that's alw...   Mar 24 2007, 07:13 PM
- - nprev   Should I resurrect my world-famous (though previou...   Mar 24 2007, 07:25 PM
- - edstrick   At the rate they're running out of spares, the...   Mar 25 2007, 09:18 AM
|- - Thu   QUOTE (edstrick @ Mar 25 2007, 04:18 PM) ...   Mar 25 2007, 10:26 AM
- - ugordan   So in essence, Cassini used a Voyager wide-angle s...   Mar 26 2007, 01:17 PM
|- - tedstryk   QUOTE (ugordan @ Mar 26 2007, 01:17 PM) S...   Mar 26 2007, 02:27 PM
- - monitorlizard   Imagine the kind of spares lying around from milit...   Mar 26 2007, 02:15 PM
|- - Jim from NSF.com   QUOTE (monitorlizard @ Mar 26 2007, 10:15...   Mar 26 2007, 03:08 PM
|- - tty   QUOTE (Jim from NSF.com @ Mar 26 2007, 05...   Mar 28 2007, 06:46 AM
- - remcook   http://www.spaceflightnow.com/news/n0708/26mro/ ...   Aug 27 2007, 09:45 AM

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