MSL FAQ - The pool of questions |
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MSL FAQ - The pool of questions |
 Dec 26 2008, 01:23 AM
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#151
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 Merciless Robot  Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602  |
I figured as much. The descent stage should be kept as functionally simple as possible, particularly since it's a brand-new technique; the bells & whistles can come on later missions.
-------------------- 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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Dec 26 2008, 02:35 AM
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#152
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 Junior Member Group: Members Posts: 21 Joined: 15-December 08 Member No.: 4509 |
Thanks Oersted and Doug for the answers.
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Dec 26 2008, 06:55 PM
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#153
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 Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
I knew that MARDI is on the rover itself, but I thought it was doing the descent imaging job like DIMES. I guess I am confused as to if it is doing science more by characterizing the landing area or will it help with the landing real time, like DIMES did with the drift?
What is the visual instrument being used then, or is one not necessary? I seem to remember Rob Manning saying somewhere that the 2 point motion problems with skycrane were actually easier than with the 3 point MER descent stage and could be dealt with simple sensors. Does this remove the need for a DIMES type system? And can MARDI be used once on the ground, perhaps to detect slippage? If someone could wrap up those answers and distribute them to us less informed persons, that would be appropriate for an UMSF Boxing Day...  edited to correct spellling 
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
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Dec 26 2008, 07:37 PM
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#154
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
MARDI is just imaging - it's not motion estimation like DIMES. I believe the radar for the descent stage will do everything needed in terms of horez. velocity etc. (Phoenix did fine without DIMES, for example)
As for use post-landing. That's not a baseline use or requirement - but Mike Caplinger did mention that they were looking at using it after landing. One potentially use would, of course, be motion estimation for wheel slip calculation. |
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Dec 26 2008, 08:03 PM
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#155
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Senior Member Group: Members Posts: 2511 Joined: 13-September 05 Member No.: 497 |
MER needed DIMES because of the late realization that transverse velocity, which couldn't be measured by the simple radar altimeter on MER, could cause problems for the airbags. All the other landers have had or will have more capable radars that can directly sense transverse velocity (since obviously a powered soft lander has to zero out transverse velocity.)
Yes, we have been discussing using MARDI post-landing, but I would think that the MSL navcams and hazcams would be just as capable of detecting slippage. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Dec 26 2008, 08:21 PM
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#156
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Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
Thanks for clearing that up for me. I can't wait for 2011!
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
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Dec 26 2008, 08:33 PM
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#157
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Junior Member Group: Members Posts: 21 Joined: 15-December 08 Member No.: 4509 |
QUOTE (lyford @ Dec 26 2008, 12:21 PM)  Thanks for clearing that up for me. I can't wait for 2011! Me neither, this is going to be an exciting mission! |
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| Guest_Oersted_* |
Dec 27 2008, 11:42 PM
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#158
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Guests |
But we WILL have to wait.. - Two more long years. *Sigh*
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