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Zhurong maps, traverse route and location mapping
Huguet
post Aug 31 2021, 12:13 AM
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Amazing how detailed the orbiter get the track... a single track on Tianwen-1,.. Hirise will indeed be nice with its better resolution and seeing the 2 track path.
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Phil Stooke
post Sep 17 2021, 05:45 PM
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We have had no news on Tianwen-1 and Zhurong for a while. The rover at least, and probably the orbiter too, are entering a superior conjunction blackout period about now. Their blackout will be longer than NASA's, probably because it's the first time they have dealt with it and will want to be more conservative.

Meanwhile I wanted to show the difference between the existing map and the new Tianwen-1 orbiter image. My map is based on the published map with track and waypoints. The orbiter image shows tracks offset from it, with the offset increasing away from the lander (though the last point is close again). I suspect this is because of a small difference in the definitions of map projections between the projected orbiter image and the route map. (My coordinates are from HiRISE which opens the possibility of another offset, but in all cases I am matching to surface features using HiRISE as a standard). The maximum offset is about 10 m.

Phil

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Bill Harris
post Sep 18 2021, 01:51 PM
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Agreed. The 'quiet spell' from Zhurong is not to be worried about. They don't have an as-established DSN infrastructure or as much experience with dealing with a faint, noisy signal.
I'm still impressed with their Rover's track. I don't know how on-course it is, but it doesn't seem to be bumping into things...

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