by chinwi Fri Mar 14, 2014 6:32 pm
Nice to see people who are interested in this kind of developments.
To clarify about Radar usage for Air Traffic Controlling I write the following.
There is vast area of Indian Ocean without radar coverage. ATC use Radar for approach - departure controlling only.
Radar sends radio signals from the antenna towards monitoring area ( mostly 360 degrees) and analyse signals reflected from air crafts to determine their locations. No one in the air plane can switch off it. Due to high power needed its range is limited to few hundred kilometers. We have about 140 Km coverage from Colombo , as far as I Know. This is called Primary Radar.
Rest of the area is covered by data sent from air crafts to the controlling tower in addition to verbal radio messages. Transponders like ADS-B are used for this system. ADS collect location data from GPS and other data from systems in the aircraft and transmit to the receiving centers in ground.
They suspect somebody switch off this and hide MH370 from monitor screens in the ground. By that time the plane was out from the Primary Radar coverage.
This means if the plane escaped from KL Radar it can come even towards Sri Lanka without any detection.
If you go Southwards from Sri Lanka apart from Maldives, I think Australian ATC may have a Radar fixed in Cocos Island and USAF have many in Diego Garsia and in Gan Islands (South Maldives) .(rem: I did not show them in the map) .
Interestingly Diego Garcia ( US Army Base) is in reachable distance from kL by MH370.
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