Kilometers on the ground |
Kilometers on the ground |
Jul 21 2017, 10:48 AM
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#1
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Member Group: Members Posts: 125 Joined: 19-November 14 From: Québec Member No.: 7339 |
Hello everyone !
I would like to know more about the mileage grid on the ground. I have difficulty finding precise data from various unofficial sources. Here is my list: ______________________________________________________________________________ Bonjour a tous ! J'aimerais avoir des précisions sur la grille de kilométrage parcourus au sol. J'ai des difficulter a trouver des données bien précises à différentes sources non officiel. Voici ma liste : ______________________________________________________________________________ 1 km Sol 335, 17 juillet 2 km Sol 363, 14 août 3 km Sol 403, 24 sept 4 km Sol 431, 22 oct 5 km Sol 521, 23 janv 6 km Sol 568, 12 mars 7 km Sol 641, 26 mai 8 km Sol 668, 23 juin 9 km Sol 709, 4 août 10 km Sol 957, 16 avril 11 km Sol 1296 12 km Sol 1439 13 km 14 km Sol 1448 15 km 16 km Sol 1669 -------------------- |
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Jul 31 2017, 05:22 PM
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#2
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Member Group: Members Posts: 920 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
It depends on what you mean by traveled distance. Many thanks for your reply, Paolo. Appreciated. Wouldn't including the twists and turns - which, to me, seems the correct thing to do - make the odometry grow faster and, thus, crossing the km mark earlier? This seems to be the case up to km 10 (comparing the two columns) but not afterwards. As a curiosity: the average segment size is 0.9024 m with a standard deviation of 0.6396 I'm sticking to the JPL announcements Fernando |
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Jul 31 2017, 06:19 PM
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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 |
Many thanks for your reply, Paolo. Appreciated. Wouldn't including the twists and turns - which, to me, seems the correct thing to do - make the odometry grow faster and, thus, crossing the km mark earlier? .... As a curiosity: the average segment size is 0.9024 m with a standard deviation of 0.6396 I'm sticking to the JPL announcements Fernando Yes, it should but in cases where we had a very high value of slip that might have not been accounted for by the on-board software, or because of accumulated errors in position estimate, the rover might think it has moved more than it actually did so periodically Tim Parker (our resident Phil Stooke) re-localizes the vehicle position, and that's what it is poked in PLACES. While MSL has a better definition of rover odometry than MER it is still not uniquely defined. As the saying goes "a man with a watch knows what time it is, a man that has two is never sure!" Regarding the average segment length, I actually never measured it. This also would require a definition of what "straight line segment" actually means. I typically use the Pavlidis algorithm to define a straight line segment and set the tolerance to 10% (if the width of a set of points is within 10% of the length of the path, I call is a straight segment). If I have some spare time, I will run some numbers. 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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