Malaysia Airlines MH370 flight search into the third week . The new findings reveal the presence of debris in the Indian Ocean that allegedly was part of the plane . However, there are no bright spots of some of these findings .
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The length of the missing plane search since Saturday ( 03/08/2014 ) invites a number of questions from the general public .
One is why the advanced satellite or spy satellites belonging to developed countries can not detect the presence of this aircraft ? Are not these satellites can be used to take pictures with a high resolution ?
According to News Scientist , there are currently 10 satellites that have the ability to take high-resolution photos . Most of satellites operated by the United States , Russia , and several European countries .
The satellite orbits the Earth about one and a half hours. “Each satellite may cover only a few percent of the Earth every day , ” said Jonathan McDowell , a scientist who works at the Harvard- Smithsonian Center For Astrophysics , in Cambridge , Massachusetts .
However , the satellite also has limitations , such as being in a period of treatment , the clouds that cover the search area , and satellites are also not taking photos every time .
In addition, the area is often photographed urban areas than ocean usually no interesting objects .
On the other hand , according to McDowell , spy satellites have a broader scope and can be used to take a photo with a higher resolution . The satellite also has a software called McDowell’s more sophisticated image processing which can identify the debris in the ocean , or even seen an explosion in the sky .
However , McDowell said that the spy satellites do not have a primary function to follow the movement of aircraft . Running orbit is also not widely known. However , if the agent has such data confidential , McDowell believed that they would provide information to the authorities .
All signals from MH370 examined
Looking flake plane ( if it falls ) in the extent of sea is not an easy matter . MH370 case reminds us of the tragedy of Air France flight number AF447 which crashed in the Atlantic Ocean in 2009 . At that time , the team assigned to search for plane debris takes up to two years .
Several navigational aids and communications are now beginning to be examined in the data plane to track the whereabouts of the B777 - 200ER aircraft owned Malaysia Airlines , among which the transponder , ADS - B , and ACARS .
All aircraft is equipped with a radar transponder which transmits the location information and the identity of the aircraft. The information distributed through radio signals . However , once outside the range , the radar can not menjejakinya . So even with the signals emitted by the black box ( black box ) plane which only lasted for 30 days .
In addition to radar transponders , new navigational aids that are now popularly used is the ADS - B ( Automatic Dependent Surveillance - Broadcast ) . The signal transmits aircraft GPS information , complete with identity and altitude ranges .
ADS - B signals were used several plane - tracking applications , such as Flightradar24 ( FR24 ) . In fact , according to FR24 recognition , ADS - B signals MH370 was still within their reach a few moments before it disappeared .
Communication systems ACARS ( Aircraft Communications Addressing and Reporting System ) data belonging MH370 also dissected . ACARS is used to report the in-flight system data via VHF radio or satellite . Rolls Royce , the engine manufacturer used by the B777 - 200ER Malaysia Airlines , reported that MH370 was sent ACARS reports in real time before it disappears . (see also: situs download lagu)
Transmitted signal can also be used as a black box search sources , but the signal is emitted after a clash lasted for 30 days . And , to search for the signal at the site of an extensive search is not easy .