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mars_armer
post Apr 4 2005, 02:38 PM
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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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dot.dk
post Apr 4 2005, 04:18 PM
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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?  sad.gif
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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?


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djellison
post Apr 4 2005, 06:22 PM
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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 smile.gif

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 smile.gif

Doug
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Posts in this topic
- mars_armer   Safe Mode   Apr 4 2005, 02:38 PM
- - djellison   Now that's bad news. I suppose they could bri...   Apr 4 2005, 02:55 PM
|- - MahFL   I was wondering why there were no new images since...   Apr 4 2005, 03:25 PM
- - Sunspot   Are they still able to command the rovers in the n...   Apr 4 2005, 04:03 PM
- - dot.dk   QUOTE (Sunspot @ Apr 4 2005, 04:03 PM)Are the...   Apr 4 2005, 04:18 PM
|- - tedstryk   QUOTE (dot.dk @ Apr 4 2005, 04:18 PM)QUOTE (S...   Apr 4 2005, 04:51 PM
|- - djellison   QUOTE (dot.dk @ Apr 4 2005, 04:18 PM)downlink...   Apr 4 2005, 06:22 PM
|- - dvandorn   QUOTE (djellison @ Apr 4 2005, 12:22 PM)QUOTE...   Apr 4 2005, 07:10 PM
|- - cIclops   QUOTE (dvandorn @ Apr 4 2005, 07:10 PM)Heck -...   Apr 4 2005, 07:26 PM
|- - tedstryk   [/quote] Makes you appreciate why Squyres, in one...   Apr 4 2005, 08:27 PM
- - djellison   A typical rover day - roughtly - in local solar t...   Apr 4 2005, 04:21 PM
|- - mars_armer   QUOTE (djellison @ Apr 4 2005, 04:21 PM)The b...   Apr 4 2005, 06:44 PM
- - Sunspot   I think they were planning 2 days of imaging at Vi...   Apr 4 2005, 04:48 PM
- - dot.dk   Can't wait for relay via MRO then hehe   Apr 4 2005, 05:01 PM
- - dot.dk   IF Odessey is crippled could they use Mars Express...   Apr 4 2005, 07:28 PM
- - djellison   I'll hold one end - and you start walking, sto...   Apr 4 2005, 07:28 PM
- - alan   There have been three images (full resolution not ...   Apr 4 2005, 08:36 PM
|- - mars_armer   QUOTE (alan @ Apr 4 2005, 08:36 PM)There have...   Apr 4 2005, 09:16 PM
- - dvandorn   I've done some extensive Googling, and can...   Apr 5 2005, 08:13 PM
|- - cIclops   QUOTE (dvandorn @ Apr 5 2005, 08:13 PM)I...   Apr 5 2005, 08:50 PM
|- - mars_armer   QUOTE (dvandorn @ Apr 5 2005, 08:13 PM)I...   Apr 5 2005, 10:02 PM
- - slinted   Just a quick mention, with regards to the importan...   Apr 6 2005, 12:12 AM
|- - djellison   QUOTE (slinted @ Apr 6 2005, 12:12 AM)So, if ...   Apr 6 2005, 08:54 AM
- - Sunspot   Yikes....this is starting to sound REALLY bad for ...   Apr 6 2005, 09:45 AM
- - djellison   I'm quite disgusted by the lack of information...   Apr 6 2005, 09:52 AM
- - Sunspot   .....it seems the people that use and read this me...   Apr 6 2005, 10:02 AM
- - djellison   If anyone wants to poke around somewhere they prob...   Apr 6 2005, 10:14 AM
|- - chris   QUOTE (djellison @ Apr 6 2005, 10:14 AM)07925...   Apr 6 2005, 10:44 AM
|- - RedSky   QUOTE (djellison @ Apr 6 2005, 05:14 AM)If an...   Apr 6 2005, 10:05 PM
|- - cIclops   Finally an "official" story from NASA ab...   Apr 9 2005, 09:20 AM
- - djellison   Well - that would have been about Feb 10th If th...   Apr 6 2005, 10:53 AM
|- - chris   QUOTE (djellison @ Apr 6 2005, 10:53 AM)Well ...   Apr 6 2005, 11:36 AM
- - OWW   Thanks Doug for that link. Look at this pdf on tha...   Apr 6 2005, 12:31 PM
|- - djellison   QUOTE (ObsessedWithWorlds @ Apr 6 2005, 12:31...   Apr 6 2005, 04:27 PM
- - alan   Twenty new navcams were added at exploratorium 15 ...   Apr 6 2005, 09:15 PM
|- - mars_armer   QUOTE (alan @ Apr 6 2005, 09:15 PM)Twenty new...   Apr 6 2005, 09:33 PM
- - Sunspot   Either they didnt drive or the drive stalled as Sp...   Apr 9 2005, 11:38 AM


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