Extricating Spirit, Digging out from Troy |
Extricating Spirit, Digging out from Troy |
Nov 7 2009, 04:13 PM
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#1
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Member Group: Members Posts: 239 Joined: 18-December 07 From: New York Member No.: 3982 |
5 downsampled navcam frames from sol 2078 are down. Someone might want to make an animation.
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Apr 13 2010, 04:13 PM
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#2
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Senior Member Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 |
What matters is that the movement of the rover is small compared to the relevant scale. No doubt the rover shifts a bit each time the wind changes direction, but probably by only a very small fraction of a millimetre. Surely such movements would be unimportant for the core studies, but those same movements could be critical for the seismology experiments.
In the case of the core studies, there is some relevant scale, but I don't know what it is. As mentioned above the signal wavelength sets an absolute lower limit to movement that you'd care about, in the cm range. There could be many factors that make that lower limit larger. If it was several metres, then movements of tens of cm would be unimportant. The errors induced by the rover movement would be swamped by other errors. Another point is that it might be that the movements could be corrected for in the core studies. Remember that the driven rover movements aren't random noise - the distances and directions and orientations are known with high precision. Edit - definitely you're right, Phil, that cm are not measured directly. But still the relevant timing errors correspond to some position errors, since the signals travel at a fixed speed, 300 000 km/s. |
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