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The Top of Vera Rubin Ridge Part 2, Site 67-73, sol 1944-2297, 24 Jan 2018-22 Jan 2019
PaulH51
post Sep 21 2018, 01:35 AM
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QUOTE (djellison @ Sep 21 2018, 06:33 AM) *
They're just a ground data system burp of data.

Thanks Doug...
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jvandriel
post Sep 21 2018, 07:44 AM
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Here is my process for DeBayerin'....


Thanks for the advise Sean.

It saves me a lot of time and R.S.I. ( 21 mouseclicks per image with ImageJ and now just a few with GIMP and GMIC )

Thanks again.

Jan van Driel
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PaulM
post Sep 23 2018, 08:54 AM
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The processor board in Curiosity is similar to that in Opportunity.
The flash data memory system in Opportunity failed about two years ago and just like Curiosity,
Opportunity still has un-transmitted science data in flash memory on board.
Opportunity continued to be usable until her recent problems with dust by using RAM to store all command sequences and to store all science data.
Presumably Curiosity could also switch to using RAM for command and science data storage and continue to do science.
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mcaplinger
post Sep 23 2018, 02:42 PM
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QUOTE (PaulM @ Sep 23 2018, 12:54 AM) *
The processor board in Curiosity is similar to that in Opportunity.

Not very similar (RAD750 compared to RAD6000) and the flash is not on the processor board anyway.

If there was a flash issue, on MSL this would be handled by switching to the redundant computer.


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Phil Stooke
post Sep 26 2018, 11:08 PM
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Any news yet on progress with Curiosity's memory issue?

Phil


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PaulH51
post Sep 27 2018, 09:46 PM
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QUOTE (Phil Stooke @ Sep 27 2018, 07:08 AM) *
Any news yet on progress with Curiosity's memory issue?

The silence is deafening, hope we'll hear something before weekend...
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xflare
post Oct 3 2018, 01:04 PM
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There was a data down link from Curiosity this morning.

https://twitter.com/dsn_status/status/1047337018492166144
https://twitter.com/dsn_status/status/1047325785147809792

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PaulH51
post Oct 3 2018, 01:10 PM
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The next sunrise for Curiosity will be in a few hours on sol 2190. With only one mission update since the last images were received from Curiosity (on sol 2172) I know I'm not the only one with extensive withdrawal symptoms, not just from the lack of new images, but the lack of news about the investigation, which is somewhat frustrating compared to the regular updates during the sol 200 event... I know those updates did not tell us much, but at least they were made. I guess this is compounded by the duration of this anomaly, as it has already exceeded the sol 200 event on the A-side computer and the fact that the other rover on Mars is also silent. I hope they reach in the next days to let us know what's going on... Not sure what politics the previous post is referring to, can someone enlighten me?
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mcaplinger
post Oct 3 2018, 01:47 PM
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Go back and read the last update and note that it said "Because the amount of data coming down is limited, it might take some time for the engineering team to diagnose the problem".

You don't want to rush these things.


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serpens
post Oct 3 2018, 01:54 PM
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[quote name='xflare' date='Oct 3 2018, 01:04 PM' post='241303']
There was a data down link from Curiosity this morning....

10 bps? That is positively glacial. If correct then no wonder a few weeks has passed with no update.
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mcaplinger
post Oct 3 2018, 03:02 PM
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QUOTE (serpens @ Oct 3 2018, 05:54 AM) *
10 bps? That is positively glacial. If correct then no wonder a few weeks has passed with no update.

Read https://descanso.jpl.nasa.gov/DPSummary/Des...MSL_Telecom.pdf although unlike the MER equivalent it was written pre-launch and doesn't have any of the post-launch experience data.

QUOTE
The downlink signal level achievable using the [Rover LGA] is too low for all but special DTE applications.


The RLGA on MSL is quite limited for downlink as the mission was designed to be mostly reliant on the HGA and on UHF passes. The RLGA can support 40 bps to the 34m net for some Earth-Mars ranges but at some ranges it can't even manage 10 bps (see figure 4-11).

But I don't know if they've been using the LGA or, if so, how much.


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serpens
post Oct 3 2018, 11:45 PM
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Thanks mcaplinger.
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elakdawalla
post Oct 3 2018, 11:56 PM
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Update.
QUOTE
Engineers at NASA's Jet Propulsion Laboratory in Pasadena, California, this week commanded the agency's Curiosity rover to switch to its second computer. The switch will enable engineers to do a detailed diagnosis of a technical issue that has prevented the rover's active computer from storing science and some key engineering data since Sept. 15.

Like many NASA spacecraft, Curiosity was designed with two, redundant computers -- in this case, referred to as a Side-A and a Side-B computer -- so that it can continue operations if one experiences a glitch. After reviewing several options, JPL engineers recommended that the rover switch from Side B to Side A, the computer the rover used initially after landing.

The rover continues to send limited engineering data stored in short-term memory when it connects to a relay orbiter. It is otherwise healthy and receiving commands. But whatever is preventing Curiosity from storing science data in long-term memory is also preventing the storage of the rover's event records, a journal of all its actions that engineers need in order to make a diagnosis. The computer swap will allow data and event records to be stored on the Side-A computer.

Side A experienced hardware and software issues over five years ago on sol 200 of the mission, leaving the rover uncommandable and running down its battery. At that time, the team successfully switched to Side B. Engineers have since diagnosed and quarantined the part of Side A's memory that was affected so that computer is again available to support the mission.

"At this point, we're confident we'll be getting back to full operations, but it's too early to say how soon," said Steven Lee of JPL, Curiosity's deputy project manager. "We are operating on Side A starting today, but it could take us time to fully understand the root cause of the issue and devise workarounds for the memory on Side B.

"We spent the last week checking out Side A and preparing it for the swap," Lee said. "It's certainly possible to run the mission on the Side-A computer if we really need to. But our plan is to switch back to Side B as soon as we can fix the problem to utilize its larger memory size."


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PaulM
post Oct 12 2018, 12:49 PM
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It suprises me that both marsrovers are having problems at the same time. I wonder if there is a common cause for both failures. Is it possible that mars dust has found its way deep inside each rover and is effecting the electronics. Is mars dust conductive?
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mcaplinger
post Oct 12 2018, 03:35 PM
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QUOTE (PaulM @ Oct 12 2018, 04:49 AM) *
It suprises me that both marsrovers are having problems at the same time. I wonder if there is a common cause for both failures.

I think it's simply a coincidence. Even if dust got into the rovers, the electronics are conformally coated to protect against shorts from loose metallic particles.

Some significant fraction of martian dust is magnetic, so it's probably also electrically conductive.


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