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How Satellite Company Inmarsat Tracked Down MH370
mdsolar (1045926) writes "Malaysian Prime Minister Najib Razak has announced that, based on satellite data analysis from UK company Inmarsat, Malayian Airlines flight MH370 ended in the southern Indian Ocean, and no one on board survived. 'Effectually we looked at the doppler effect, which is the change in frequency, due to the movement of a satellite in its orbit. What that then gave us was a predicted path for the northerly route and a predicted path the southerly route,' explained Chris McLaughlin, senior vice president of external affairs at Inmarsat. 'What we discovered was a correlation with the southerly route and not with the northern route after the final turn that the aircraft made, so we could be as close to certain as anybody could be in that situation that it went south. Where we then went was to work out where the last ping was, knowing that the aircraft still had some fuel, but that it would have run out before the next automated ping. We don't know what speed the aircraft was flying at, but we assumed about 450 knots.' Inmarsat passed the relevant analysis to the UK Air Accidents Investigation Branch (AAIB) yesterday. The cause of the crash remains a mystery."
We still have no idea exactly where the aircraft is, how it went down, or what to do now.
Did the Malaysian government just make a statement to the families based on a statistical probability?
Or did they make that statement based on debris found that was positively identified to the aircraft.
"Oh, you hate your job? There's a support group for that, it's called everyone, they meet at the bar."
They have narrowed down the presumed crash site. TFA states that the Malaysian government takes this data as proof that the plane crashed near Australia. While important evidence, it's hardly proof - we will need actual debris.
The Malaysian government has been widely criticized about it's handling of this affair. They would like to wash their hands of it and go on to doing whatever it was they were doing out of the world's spotlight.
Faster! Faster! Faster would be better!
Still vastly better than what it was only a day ago, and there seems to be a lot more possible debris sightings in the search area which I take as a sign they might be in the right area and will hopefully pin it down some more. The race now is to find it before the black box transmitters go silent, a task for which the US is dispatching some specialist search gear apparently, because that's probably the only hope of giving the bereaved a chance at some closure left now.
UNIX? They're not even circumcised! Savages!
They're probably worthless, the cockpit voice recorders are only required to have 30 minutes capacity with a recommendation for 2 hours, since we know it was at least 4 hours between the critical event (the plane turning south) and the crash the CVR's won't have any information about the events that matter (I'm assuming 777 uses digital recorders so they won't be able to pull phantom prior recordings like they sometimes were able to on analog recorders)
There are 4 boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order. Starting now.
The cause of the crash isn't a mystery. It most likely ran out of fuel.
The cause of why the whole damn plane went AWOL IS a mystery.
Do not meddle in the affairs of sysadmins, for they are subtle, and quick to anger.
It's only completely worthless if its silent.
On the contrary. A completely silent CVR tells you a lot; it tells you that the airplane kept on flying with every one on board either unconscious or dead for at least 2 hours before the crash. That's a critical information for the investigation.
Furthermore, through data/media forensic, you might be able to recover the previous data that was overrecorded, although I wouldn't count on it after 3 to 4 record cycles.
How come the frequency information of the signal received by the satellite was saved? What is the purpose of saving all that data in normal operations?
The communications system in question is likely based on TDMA (Time Division Multiple Access). While I have not worked with Inmarsat systems, all the other satcom systems I have worked with log each connection, and various pieces of information regarding the connection. One of these parameters that is logged is the frequency offset (ie the difference between the expected and actual frequency). This is useful from a troubleshooting perspective as it allows you to spot transmitter and receiver components that are drifting out of specification. Some of the more advanced satellite systems (iDirect) will actually log the geographic coordinates of the uplink site, as this plays into the timing requirements for the network. Unfortunately, Inmarsat isn't this aggressive with their timing, so time of flight isn't an issue).
And why did it take three weeks to do that analysis?
This is pure speculation on my part, but I would wager they had to go back through significant amounts of logs in order to characterize the transmitter and receiver components on that particular aircraft. The doppler effect is going to be subtle compared to the thermal drift of the transmitter, so they need to factor that out before they can get at the thermal drift. Also every oscillator and transmitter is different, so they would need to characterize the transmitter that is on that specific aircraft (which is now of course missing).
...si hoc legere nimium eruditionis habes...
as a practical matter actually finding the plane won't change much
Really? You don't think there's much of a difference between knowing it was a mechanical failure (or fire, etc) and knowing it was a deliberate criminal act? If the problem was related to payload or the aircraft's infrastructure or maintenance, you don't think it's vital for all of the other people flying on that same equipment to know what went wrong? If this was done by the pilot(s) at the behest of some organization or state, or otherwise in the service of some agenda, you don't think that's meaningful, in the context of trying to prevent it from happening again? Glad you're so relaxed about it. You probably don't do much business overseas, or ship expensive things that are central to your mission, or have relatives that fly on that equipment or in that part of the world, so that's probably why the death of hundreds and the loss of a huge, expensive aircraft is a yawner to you.
Don't disappoint your bird dog. Go to the range.
CVRs on those aircraft are 2 hours, not 30 minutes.
What I want to know, is why my phone (the smallest model made) can hold 1100 hours of compressed audio ... but these aircraft using NAND don't hold more than 2 hours of uncompressed audio (you don't want any quality sacrifices or artifacts from compression to screw up your analysis later) in a redundant array ...
Someones going to tell me that for the 30-40k those black boxes cost ... they can't put some actual storage space in the fucking things?
Persistent Volume manager for Kubernetes - https://github.com/dwimsey/openshift-pvmanager
What's most interesting is that the anonymous reports from the US intelligence community the day after the plane disappeared said that the plane was on the bottom of the Indian Ocean. These claims seemed a little odd at the time since there was no supporting evidence at all and rescuers were still looking for debris on the original flight path. But, it's looking like they were spot on.
I'm going to go out on a limb and suggest that the only real conspiracy in this whole affair is the US govt's cover up of the initial leak. The plane itself likely just suffered a catastrophic failure and lumbered on until it ran out of fuel. But, the US govt also likely tracked it the entire time. That's why someone was able to make a confident pronouncement so quickly. They knew exactly where the plane was, if not exactly what happened. But, this intelligence capability (tracking all flying objects all the time) is probably highly classified. Rather than give it up for a civilian SAR effort, they decided to keep it under wraps, knowing that eventually the plane would be found and the capability is far more useful if no one knows it exists.
As a supervillian I prefer locations such as this, such as my base deep on the ocean floor. Hopefully they don't find it when they look for the damn plane.
They already know about your Skull Volcano island... they dont care because the US government hopes to contract out your services for the "protection" of the American People...
BTW: you have those genetically altered badgers ready yet?
Do not look at laser with remaining good eye.
You are making a PRESUMPTION that the transponders were turned off by hand. There is still the possibility of a fire or some other case. This is why recovery of the FDR's is so important. The pilots may not have been on the radio, but the FDR's record everything they say. The conversations between flight crew is crucial, along with all the airplane data.
Still vastly better than what it was only a day ago, and there seems to be a lot more possible debris sightings in the search area which I take as a sign they might be in the right area and will hopefully pin it down some more. The race now is to find it before the black box transmitters go silent, a task for which the US is dispatching some specialist search gear apparently, because that's probably the only hope of giving the bereaved a chance at some closure left now.
Forget the bereaved, how on earth will the media ever get closure if the plane isn't found?
Even those who arrange and design shrubberies are under considerable economic stress at this period in history.
The ones with the skunk glands?
Badgers? We don't need no steeeking badgers.
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While this has captured much attention, quite honestly it is a yawner. Did you know that approximately 150,000 other people died that day? I'm willing to bet more than 2500 were preventable in some manner, making that 10x more important than MH370.
When you step back and actually review numbers, many things seem insignificant, if you have no personal feelings or emotions tying you to the event. Like this post, discussion, and website.
I finally updated my sig, but now it's lame.