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Apr 4 2005, 02:38 PM
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Junior Member Group: Members Posts: 90 Joined: 13-January 05 Member No.: 143 |
I just heard that Odyssey went into safe mode on Saturday. I haven't seen any official announcement yet.
One result is that MER is having to replan using direct to earth only. Current estimate is that Odyssey will not be able to support UHF relay until "mid-week at the earliest". |
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Apr 4 2005, 04:18 PM
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Member Group: Members Posts: 578 Joined: 5-November 04 From: Denmark Member No.: 107 |
QUOTE (Sunspot @ Apr 4 2005, 04:03 PM) Are they still able to command the rovers in the normal way, just not transmit large amounts of data? I suppose they've put off all driving and science activities until the problem is resolved? Why should they do that? Just send commands and downlink via direct to Earth sessions. And Why has MGS not been used for relay as much as Odessey? -------------------- "I want to make as many people as possible feel like they are part of this adventure. We are going to give everybody a sense of what exploring the surface of another world is really like"
- Steven Squyres |
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Apr 4 2005, 06:22 PM
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
QUOTE (dot.dk @ Apr 4 2005, 04:18 PM) downlink via direct to Earth sessions. One 12 minute UHF pass with Odyssey = 184 Mbits Typically done 2 times per sol, call it 300 Mbits. 300 Mbits at 8kbps DTE (on DSN antennae already scheduled for other missions) = 10.4 hrs. The most they could use the DTE for in a sol is a couple of hours, it takes a lot of power, and means that a single sols data would take perhaps 4 sols to downlink - during which time, the flash memory will have filled up - two fold MGS uses the MOC buffer for UHF ops - and so it plays hell with scheduling of MGS ops - has to be planned quite well in advance. Odyssey was doing more than enough for relay ops - so MGS was turned back to mapping ops. They only uplink to MGS about 3 or 4 times a week - and the sequence to include fill-in UHF passes would take a week or so to write - so by the time they've written the sequences, uplinked them....Odyssey will be back on course Doug |
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