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Spirit Rover Communications Error
cybrthng writes "Through yesterdays press release and the current Nasa Briefing there is news that they are having communications errors with contacting spirit. Is she lost or is it something akin to the Pathfinder failures that happened? Or did little green people claim an expensive tonka truck toy?"
A considerable number of things have to work properly for the rover to be in its present state. Mars Global Surveyor received a carrier on UHF but no data, confirming that the UHF antenna, amplifier, and tranmitter are functional. The fact that it transmitted at the correct time (at night) indicates batteries and power systems are at least mostly functional, and that the spacecraft computer/avionics system was able to calculate the time of the MGS pass.
Also, NASA's DSN (Deep Space Network) has been able to send commands asking Spirit to send tones on X-Band, and has received the response tones back. This confirms that at least the low gain antenna, antenna switch, x-band receiver, and x-band tone transmitter are functional.
Perhaps a software fault or a synchronization problem with the radios is preventing valid daa frames from being transmitted. The fact that so much is known to functional argues against a failure that will incapacitate the spacecraft indefinitely. In the coming days, if communications are not restored, the spacecraft will enter safe modes that cause it to try harder to transmit and will reset subsystems. I am optimistic at this point.
AFAICT, this is not a Big Deal. They recieved acknolegement from the rover, they just haven't heard anything since. It's certainly possible it went haywire, and flipped itself over, and is now just doomed, but it seems unlikely. Sojourner managed to survive comms glitches, and I'm sure this buggy will, too. Hell, it's not like dropped packets are unheard of on the Internet, and we still manage to read slashdot every day.
I suppose if I was ambitious, this would be a good time for a joke about sSFGKJL%% NO CARRIER
While this is a serious setback it illustrates an important point that many seem to have missed. Its damed _hard_ to operate a complicated piece of equipment you can't deal with in real time or even near real time. The rover is some of the best science we have deployed to another planet and I am sure many will point to this and say that is an indication that we should send more rovers and robots to Mars before we even consider sending people. I disagree with this point, since in many cases a human could avoid problems or work around them in ways that a robot currently cannnot. I don't believe that human life is cheap at all and every effort should be made to keep explorers safe, but believing that there will no cost in human life in our quest to explore the stars is just naive. I would rather our next step to be deploying a manned orbiter around Mars, with the intention of being able to drop far less sophisticated robots and rovers who are controlled by humans orbiting above. This gives a great deal more flexibility and makes incidents on the Red Planet much less likely to cause a mission to be a complete multi-million dollar/euro failure.
Now I'm going to say this: would all the people that bragged about NASA/JPL doing so much better than the Beagle team be quiet?
Guess what. Landing a complex machine on another planet is not easy. It's simply amazing humans can even do this at all. When something goes wrong, we can't exactly reach out and tap the little thing a few times to see if it fixes it.
The teams behind both Spirit and Beagle did excellent work against the insane list of Things That Can Go Wrong in getting something from here to there. Both teams did their best, and both teams make me feel very proud of the human race.
"To confine our attention to terrestrial matters would be to limit the human spirit." -Stephen Hawking
Or maybe there's one really paranoid engineer who complains about everything and, coincidentally, was right this one time.
Hey freaks: now you're ju
Some things get simpler with humans around, but many also get harder. Remember that manned missions to Mars cost something like 100 times more than unmanned. Measuring how much you get out of it per billion dollars is the interesting measure, not how much you get per mission.
Yeah, that's funny. It may not be too far from the truth. the particular Java implementation they're using is realtime, so they can tune down or completely turn off garbage collection. Threads running with no interruption from garbage collection have a heap penalty, so they have to be really careful when to put a thread in that state.
IANAJPLR (I am not a JPL researcher) but I'm sure, however, there's a whole bunch of fail-safes that would kick in so that the worst case scenario is a loss of one day's worth of scientific data, if that.
A programmer is a machine for converting coffee into code.
The Meridiani Planum landing site is smack dab in the middle of a large (as in spotted from space using the MGS Thermal Emission Spectrometer) bed of gray hematite. In addition there are spots of lower albedo in the features there that seem to show greater hydration. Couple that with the data from Odyssey's Gamma Ray Spectrometer that shows an extra hydrogen abundance there and it's a prime candidate for a bunch of near surface water.
Gray hematite is a ferrous oxide crystal that normally forms on Earth in water, especially in hot springs and the like. It's a great place to go if you're looking for signs of water. This is the only place on Mars we know that shows gray hematite in any large quantities.
The Meridiani site is easier to get to than the Gusev site, but that doesn't make it look scientifically less interesting.
100% lame and tired.
Helium balloons want to be free.
He then tried to sell a reporter an R2 unit with a bad motivator
I hate to be picky, but that was an R5 unit. The dead give away was the more cylindrical head than the R2 units have. And before someone mentions that the droid on Owi-Wan's ship in Attack of the Clones was an R4 unit with a spherical head like the R2 units, that was something that bugged me from the first time I saw that movie...
(ok, ok, my 4 year old son loves the Star Wars movies...)
I'm not a prophet or a stone-age man,
I'm just a mortal with potential of a super man.