New Horizons Hibernation and Cruise to Pluto |
New Horizons Hibernation and Cruise to Pluto |
Guest_AlexBlackwell_* |
Jun 28 2007, 10:05 PM
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#1
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Guests |
I thought I'd kick off a new thread with this announcement:
New Horizons Slips into Electronic Slumber June 28, 2007 |
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Aug 7 2007, 03:29 PM
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#2
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I do hope this turns out to be a weird software issue rather than a hardware problem even though extensive ground testing probably makes software bugs less likely.
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Aug 7 2007, 04:14 PM
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#3
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Senior Member Group: Members Posts: 1591 Joined: 14-October 05 From: Vermont Member No.: 530 |
I do hope this turns out to be a weird software issue rather than a hardware problem even though extensive ground testing probably makes software bugs less likely. I hope it's neither. I hope it was an uncorrectable, transient, radiation-induced error. What will be most interesting is how deep the safe mode is, and how graceful the failure is. |
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Aug 7 2007, 04:26 PM
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#4
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I hope it was an uncorrectable, transient, radiation-induced error. That wouldn't be too good, either. It would mean the spacecraft is too sensitive to random, unpredictable cosmic-ray events even while in the state of hibernation when most of the electronics are powered off. Imagine a trip like that during Pluto closest approach. I'd actually put those kinds of faults in the hardware "fault" category. -------------------- |
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Aug 7 2007, 05:31 PM
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#5
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Senior Member Group: Members Posts: 1591 Joined: 14-October 05 From: Vermont Member No.: 530 |
That wouldn't be too good, either. It would mean the spacecraft is too sensitive to random, unpredictable cosmic-ray events even while in the state of hibernation when most of the electronics are powered off. Imagine a trip like that during Pluto closest approach. I'd actually put those kinds of faults in the hardware "fault" category. I think it was reading the GP-B updates with all the talk of multi-bit errors that makes me think they're something you have to live with... GP-B dealt with them far more often than 1 in 2 years. i.e. http://einstein.stanford.edu/highlights/hl_040105.html "Investigations into the root causes of the recent spate of MBEs suggests the possibility that the scrub routine which is checking the memory cells of the on-board Command & Control Computer Assembly (CCCA) could trigger a safemode response on a single MBE if that error occurs in certain locations. As a result, the team has re-programmed the safemode response for the MBE test to automatically stop the mission timeline, rather than rebooting the computer." |
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