Post Solar Conjunction/Santorini Study Drive, The second leg in our Journey to Endeavor Crater |
Post Solar Conjunction/Santorini Study Drive, The second leg in our Journey to Endeavor Crater |
Guest_Bobby_* |
Dec 21 2008, 08:58 PM
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#1
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Guests |
As we are about to end our study of The Cobble Santorini and getting ready to hit the road again.
I think it's time we start a new topic on the drive to come. What challenges do we face and can we keep to solid pavement as much as possible and a Merry Christmas to our little buddies on The Planet Mars. |
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Jan 12 2009, 01:06 AM
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#2
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Open-loop operation based on operational experience; got it, thanks, Paolo!
More curiosity: I'm assuming that you guys built a table of the observed RAT-Z position vs. applied motor voltage/time. What sort of angular resolution did you get within your confidence/comfort level? Has the motor response changed over time as well? (I'm also assuming that it's still pretty linear, though). A lot of these engineering details are pure gold for future mission designs given the MERs' longevity. EDIT: Oops, think I meant something like 'distance resolution' instead of 'angular resolution': the Z-axis is forward/back, right? -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jan 12 2009, 09:04 AM
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#3
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
Open-loop operation based on operational experience; got it, thanks, Paolo! More curiosity: I'm assuming that you guys built a table of the observed RAT-Z position vs. applied motor voltage/time. What sort of angular resolution did you get within your confidence/comfort level? Has the motor response changed over time as well? (I'm also assuming that it's still pretty linear, though). A lot of these engineering details are pure gold for future mission designs given the MERs' longevity. EDIT: Oops, think I meant something like 'distance resolution' instead of 'angular resolution': the Z-axis is forward/back, right? As I was saying we did it pretty recently (in the Sol 1600s I think) for the first time. It might be that Honeybee had done it during development or ATLO, but I don't think we monitored this particular behavior. I do not recall exactly the test, but I believe we measured the response for ~1mm RAT_Z travel assuming the response being linear with voltage (= speed) and time. I'm afriaid this is all the details I have for the moment. Yes, MER is an engineering mine, one aspect of this mission that has not been pointed out too often! Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jan 13 2009, 09:33 PM
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#4
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
QUOTE sol 1768 Actual number of EDRs by sequence number and image type: Sol Seq.Ver ETH ESF EDN EFF ERP Tot Description ----- -------- --- --- --- --- --- ---- ----------- 01768 p1148.03 0 0 0 0 0 0 front_hazcam_rat_doc_right_eye_4bpp_pri_17 01768 p1148.03 0 0 0 0 0 0 front_hazcam_rat_doc_right_eye_4bpp_pri_17 01768 p1148.03 0 0 0 0 0 0 front_hazcam_rat_doc_right_eye_4bpp_pri_17 01768 p1154.01 0 0 0 0 0 0 front_hazcam_idd_unstow_doc 01768 p2138.09 0 0 0 0 0 0 pancam_RAT_diagnostic_R1 01768 p2138.09 0 0 0 0 0 0 pancam_RAT_diagnostic_R1 01768 p2138.09 0 0 0 0 0 0 pancam_RAT_diagnostic_R1 01768 p2138.09 0 0 0 0 0 0 pancam_RAT_diagnostic_R1 01768 p2536.22 0 0 0 0 0 0 pancam_superres_corsica_L26R12 01768 p2600.12 0 0 0 0 0 0 pancam_tau 01768 p2633.02 0 0 0 0 0 0 pancam_late_tau_L58R48 01768 Total 0 0 0 0 0 0 No driving to-sol it seems. More diagnostics. |
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Jan 13 2009, 11:52 PM
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#5
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
No driving to-sol it seems. More diagnostics. Correct. We need to retract the RAT-Z before driving. Last time we did not succeed, so we try and try again ;-) This time it should work. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jan 15 2009, 06:26 AM
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#6
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
Correct. We need to retract the RAT-Z before driving. Last time we did not succeed, so we try and try again ;-) This time it should work. ... In today's download I noticed a sequence of 4 pancams which appeared to show an extension followed by a retraction of the RAT along what I assume is the Z axis direction. It took place on sol 1768 over a period of about 6 minutes shortly before local noon.Was that the result we were hoping to see? -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Jan 15 2009, 05:26 PM
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#7
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
In today's download I noticed a sequence of 4 pancams which appeared to show an extension followed by a retraction of the RAT along what I assume is the Z axis direction. It took place on sol 1768 over a period of about 6 minutes shortly before local noon. Was that the result we were hoping to see? Not entirely. The initial extension was not expected, at least not to me which I am not an expert on the RAT flight software. Still the retraction maneuver was successful so we are good to go to drive. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jan 15 2009, 07:08 PM
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#8
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Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
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Jan 15 2009, 07:17 PM
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#9
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
...-> Yeah ! Next stop: Endeavour Crater I'm sure we will stumble into some cobbles along the way and deploy the IDD which now should be renamed Increasing Delay Device. (for those without sense of humor I mean: ) Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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