Timeline for Can the satellites in Martian orbit be put to use providing a rudimentary GPS system on Mars?
Current License: CC BY-SA 3.0
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| Sep 30, 2014 at 7:41 | comment | added | Philipp |
@LocalFluff When you have 4 time measurements with 4 positions there is only one possible time where all 4 distances line up exactly. To accurately estimate your position in n dimensions, you always need n reference points. In this example you also need your "position" in the 4th "dimension" time, so you need a 4th reference point for your position.
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| Sep 30, 2014 at 7:39 | comment | added | LocalFluff | How does a fourth satellite help time keeping? | |
| Sep 30, 2014 at 0:08 | comment | added | Mark Adler | Though that all is only if you want to get an instantaneous solution. That is important for a car or airplane on Earth, but not so much for a Mars rover that goes a few tens of meters a day. By measuring a distance to a single satellite over a period of time you can get the same kind of solution, with the accuracy depending on how long you measure, and over how many passes. If you're willing to wait a day instead of a second to get your position update, you don't need four satellites. | |
| Sep 29, 2014 at 23:16 | history | edited | Philipp | CC BY-SA 3.0 |
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| Sep 29, 2014 at 23:10 | history | edited | Philipp | CC BY-SA 3.0 |
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| Sep 29, 2014 at 23:04 | history | edited | Philipp | CC BY-SA 3.0 |
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| Sep 29, 2014 at 22:59 | history | edited | Philipp | CC BY-SA 3.0 |
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| Sep 29, 2014 at 22:53 | history | edited | Philipp | CC BY-SA 3.0 |
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| Sep 29, 2014 at 22:48 | history | answered | Philipp | CC BY-SA 3.0 |