Jim Bell Q'n'a, Questions Please |
Jim Bell Q'n'a, Questions Please |
Jan 22 2006, 11:06 PM
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
Jim Bell's agreed to do a brief Q'n'A in a few days time, so similar to the one I did for Steve, I want your questions! Try and keep it quite 'current' if you can, as we're going to make this more a 'news' outlet than a look back type chat.
We're going to try, if this one works, to do these every couple of weeks or so, a bit of Rover news and a bit of Q'n'A each time, but we'll see how this one goes first! Fire away people If they're all crap, don't worry, I've got LOADS in mind. Doug |
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Aug 14 2006, 12:45 PM
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
Here's a quick question for Jim or anyone else who knows... when we see a series of pancam pics of the sun, followed by a regular series of pancam pics, while I assume that the pics of the sun are used to renormalize the rover orientation, is that renormalized orientation applied to the immediately following series of pancam images, or is the processing done on earth and sent back to Mars, so that the renormalized orientation applies to the NEXT series of images? Also, how accurate is the sun-based orientation (+/- degrees azimuth/elevation)?
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Aug 14 2006, 02:56 PM
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Senior Member Group: Members Posts: 2519 Joined: 13-September 05 Member No.: 497 |
when we see a series of pancam pics of the sun, followed by a regular series of pancam pics, while I assume that the pics of the sun are used to renormalize the rover orientation, is that renormalized orientation applied to the immediately following series of pancam images, or is the processing done on earth and sent back to Mars, so that the renormalized orientation applies to the NEXT series of images? Also, how accurate is the sun-based orientation (+/- degrees azimuth/elevation)? I thought that most of the Sun images were being used only to estimate tau. I can't be sure from http://anserver1.eprsl.wustl.edu/anteam/me...ate_systems.ppt (page 13) if the processing is onboard or not, and I don't know the frequency with which they make these refinements. There has to be some onboard processing to provide coarse initial azimuth, but I'm not sure about fine adjustments. There's a lot more information in http://trs-new.jpl.nasa.gov/dspace/bitstre...8/1/05-0560.pdf but I haven't read through it yet. Also see Eisenman, et al, "Sun sensing on the Mars exploration rovers", http://ieeexplore.ieee.org/xpl/abs_free.jsp?arNumber=1035391 if you have IEEE access. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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