Vlucht MH370 Malaysia Airlines-ze zijn sowieso de pisang #35

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Op dinsdag 25 maart 2014 12:27 schreef Gloorbek het volgende:

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[ afbeelding ]

Aangespoeld => Plastic => Fischer price ?

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Op dinsdag 25 maart 2014 12:33 schreef Loekie1 het volgende:
De piloot was er op uit om zo min mogelijk sporen achter te laten. Misschien heeft hij het vliegtuig kunnen opblazen voordat het in zee stortte, met de bedoeling de brokstukken zo klein mogelijk te maken.

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Op dinsdag 25 maart 2014 12:33 schreef Loekie1 het volgende:
De piloot was er op uit om zo min mogelijk sporen achter te laten. Misschien heeft hij het vliegtuig kunnen opblazen voordat het in zee stortte, met de bedoeling de brokstukken zo klein mogelijk te maken.

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Op dinsdag 25 maart 2014 12:33 schreef Loekie1 het volgende:
De piloot was er op uit om zo min mogelijk sporen achter te laten.

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Op dinsdag 25 maart 2014 12:33 schreef Loekie1 het volgende:
Misschien heeft hij het vliegtuig kunnen opblazen voordat het in zee stortte, met de bedoeling de brokstukken zo klein mogelijk te maken.

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Op dinsdag 25 maart 2014 13:19 schreef PicoMMP het volgende:
Was er vandaag nou nog een persconferentie?

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Op dinsdag 25 maart 2014 13:16 schreef El_Matador het volgende:

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Bingo, maar Loekie leeft in haar eigen wereldje.

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Op dinsdag 25 maart 2014 13:18 schreef Sloggi het volgende:
Ik heb dit draadje niet echt gevolgd, maar er is toch helemaal geen reden om kwade opzet te vermoeden?

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Op dinsdag 25 maart 2014 13:23 schreef Uccie het volgende:

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Die zou er zijn, maar ik denk afgelast omdat er vandaag niet kon worden gezocht.

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Op dinsdag 25 maart 2014 13:36 schreef Unstoppable het volgende:

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Gister zeiden ze dat er vandaag meer details bekend zouden worden gemaakt, weer lijkt me daar weinig mee te maken te hebben

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Op dinsdag 25 maart 2014 13:38 schreef Uccie het volgende:

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Ligt eraan wat de details zijn.
Maar gisteren was de persco ook pas 15u onze tijd, dus het kan nog.

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On 13 March we received information from UK satellite company Inmarsat indicating that routine automatic communications between one of its satellites and the aircraft could be used to determine several possible flight paths.

Inmarsat UK has continued to refine this analysis and yesterday the AAIB presented its most recent findings, which indicate that the aircraft flew along the southern corridor.

As you have heard, an aircraft is able to communicate with ground stations via satellite.

If the ground station has not heard from an aircraft for an hour it will transmit a 'log on / log off' message, sometimes referred to as a ‘ping’, using the aircraft’s unique identifier. If the aircraft receives its unique identifier it returns a short message indicating that it is still logged on. This process has been described as a “handshake” and takes place automatically.

From the ground station log it was established that after ACARS stopped sending messages, 6 complete handshakes took place.

The position of the satellite is known, and the time that it takes the signal to be sent and received, via the satellite, to the ground station can be used to establish the range of the aircraft from the satellite. This information was used to generate arcs of possible positions from which the Northern and Southern corridors were established.
Refined analysis from Inmarsat

In recent days Inmarsat developed a second innovative technique which considers the velocity of the aircraft relative to the satellite. Depending on this relative movement, the frequency received and transmitted will differ from its normal value, in much the same way that the sound of a passing car changes as it approaches and passes by. This is called the Doppler effect. The Inmarsat technique analyses the difference between the frequency that the ground station expects to receive and that actually measured. This difference is the result of the Doppler effect and is known as the Burst Frequency Offset.

The Burst Frequency Offset changes depending on the location of the aircraft on an arc of possible positions, its direction of travel, and its speed. In order to establish confidence in its theory, Inmarsat checked its predictions using information obtained from six other B777 aircraft flying on the same day in various directions. There was good agreement.

While on the ground at Kuala Lumpur airport, and during the early stage of the flight, MH370 transmitted several messages. At this stage the location of the aircraft and the satellite were known, so it was possible to calculate system characteristics for the aircraft, satellite, and ground station.

During the flight the ground station logged the transmitted and received pulse frequencies at each handshake. Knowing the system characteristics and position of the satellite it was possible, considering aircraft performance, to determine where on each arc the calculated burst frequency offset fit best.

The analysis showed poor correlation with the Northern corridor, but good correlation with the Southern corridor, and depending on the ground speed of the aircraft it was then possible to estimate positions at 0011 UTC, at which the last complete handshake took place. I must emphasise that this is not the final position of the aircraft.

There is evidence of a partial handshake between the aircraft and ground station at 0019 UTC. At this time this transmission is not understood and is subject to further ongoing work.

No response was received from the aircraft at 0115 UTC, when the ground earth station sent the next log on / log off message. This indicates that the aircraft was no longer logged on to the network.

Therefore, some time between 0011 UTC and 0115 UTC the aircraft was no longer able to communicate with the ground station. This is consistent with the maximum endurance of the aircraft.

This analysis by Inmarsat forms the basis for further study to attempt to determine the final position of the aircraft. Accordingly, the Malaysian investigation has set up an international working group, comprising agencies with expertise in satellite communications and aircraft performance, to take this work forward.

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Op dinsdag 25 maart 2014 13:43 schreef Drebbelman het volgende:
Persconferentie is al geweest.

Technische details van de Britse experts die aanleiding gaven tot de personceferentie van gisteren zijn hier te lezen:
https://www.facebook.com/(...)854999&stream_ref=10

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Debris of MH370 in uncharted waters?
The cluster of suspected debris from Malaysian Airlines flight MH370 has been sighted above a giant undersea chain of volcanoes whose complex terrain has barely been charted, an Australian marine geologist says.
Robin Beaman, from James Cook University, said so little of the southern Indian Ocean sea floor, including the search zone, had been mapped in detail that any attempt to retrieve wreckage would require extensive 3D mapping, possibly by ships with multibeam echo sounders.

But Australia no longer has the capacity to chart depths of 3000 metres, the average depth of the search area, because the only government vessel capable of conducting mapping of that kind, the RV Southern Surveyor, had been decommissioned in December.

The research vessel's replacement was being built in Singapore and was about to undergo sea trials, Dr Beaman said.
''It's bad timing really. Australia has no capability of mapping these depths,'' he said. Multibeam echo sounders send out sound pulses in the shape of a fan, returning depths of the sea floor directly under the ship and on either side, a pattern known as a swath.
Dr Beaman said the first piece of debris spotted by DigitalGlobe satellites on March 16 was located about 60 kilometres south-west of the active zone of the Southeast Indian Ridge, a chain of underwater volcanoes that ran from the south-west of Australia to below New Zealand. Another object sighted by a Chinese aircraft was about 180 kilometres south-west of the ridge.
The suspected debris picked up by an Australian aircraft on Monday was spotted about 200 kilometres to the north-east of the ridge, Dr Beaman said.
''On the flanks of the ridge, which is very likely where any crash zone occurred, there has been virtually no … mapping apart from the odd strip,'' he said.

The complex terrain of the ridgeline, with peaks tens of metres tall, would make it difficult to spot any debris without good charts and remote-operated underwater vessels.

''It's all going to have to be remapped, there's no doubt,'' he said.
International research groups had conducted sea floor surveys in the region, using multibeam echo sounders to create 3D maps of the sea floor, but the last two surveys occurred almost 20 years ago and used outdated technology, he said.

These surveys charted several areas about 70 kilometres wide while other research ships had gathered detail on the sea floor as they sailed from one port to another, but the paths they charted were only about 10 kilometres to 20 kilometres wide.

''It'll be very unlikely that debris has fallen in those little 10 to 20-kilometre wide zones,'' he said.
''You're left with gaps of hundreds of kilometres where there is no detailed understanding of what the sea floor terrain looks like.''

Dr Beaman said it was not surprising that an area of deep open water so far from land or regular shipping routes had not been charted in detail. ''You have to put your effort where it's most needed,'' he said. ''There's very little to bump into and the search zone is 2000 kilometres from the edge of our exclusive economic zone.'' Only depth readings were available for most of the search area.
A Defence spokeswoman said while the search area was within the Australian Hydrographic Service's area of charting responsibility, it had not been mapped to great detail because of the very deep nature of the region, which made it less risky for ships.

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Op dinsdag 25 maart 2014 13:16 schreef El_Matador het volgende:

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Bingo, maar Loekie leeft in haar eigen wereldje.

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Op dinsdag 25 maart 2014 13:51 schreef Frutsel het volgende:

Knip

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Op dinsdag 25 maart 2014 14:27 schreef eight het volgende:

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Dat gaat dus nog jaren duren..

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Op dinsdag 25 maart 2014 13:43 schreef Drebbelman het volgende:
Persconferentie is al geweest.

Technische details van de Britse experts die aanleiding gaven tot de personceferentie van gisteren zijn hier te lezen:
https://www.facebook.com/(...)854999&stream_ref=10

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Op dinsdag 25 maart 2014 14:32 schreef Montagui het volgende:

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Daar heeft volgens mij al heel wat rekenwerk in gezeten.