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有人在追查:
IT expert Paul Thompson has responded to the continuing speculation that mobile phone signals on board the missing plane could have been picked up.
Thompson, who works on IT policy for the Lib Dems but is commenting in a personal capacity, says the chances of any data getting through would be extremely slim.
In response questions raised by reader Michael Rhodes, he writes:
So in short, we really shouldn’t speculate on the lack of mobile data - but investigating it may be a worthwhile avenue to pursue.
- The communication devices would have to connect to a cell tower. Although it’s possible for mobile signals to connect at medium to high altitudes (up to 15,000 ft I believe) this would be extremely patchy and tests have shown that anyone trying to connect above 2000 feet would have a very very difficult time doing so. Also, when someone is making a call while travelling they may go past several cell phone towers with each tower handing the caller onto the next, however at airliner speeds of 400mph it may be far too fast for this process to happen.
- There would have to be a GSM tower for them to connect to. We know that much of the aircraft’s path was over water where no signal would have been possible (a tower has a range of about 35km), however even when it hit land the coverage may have been patchy. Say the aircraft went due north from its last position to Burma where GSM coverage is sporadic at best (rollout only started in 2008), it would have been very lucky to catch a signal from a tower regardless of height or speed.
- We would have to know IMEI numbers for all the passengers mobile devices - this would need to be collected from each of their respective countries, as this would enable us to uniquely identify the device as being from one of the passengers - I doubt this has been done yet.
- Say a mobile did manage to connect to a GSM tower for a split second, enough for the tower to register their IMEI number, that data would have to be collected and made available to us. We are talking about several developing countries with a very wide range of mobile operators, all with varying policies and laws (if any) governing the collection of mobile data. Would that data have been saved and not overwritten after 7 days? If so, it is saved in a central database? Is that database searchable? A mobile company would only pay to build this capability if it had to.
- Has anyone asked each of the mobile operators for all of the countries MH370 could have flown over to see if any of the passengers IMEI data was recorded? The search so far has been a bit of a farce, it wouldn’t surprise me if someone hadn’t yet started this mammoth task as it only became clear in the past few days that MH370 was hijacked somehow.
还是,怎么说怎么是,谁知道Paul是谁。 cfc 有通信专家吗,能解释吗?