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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