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| This map released by Malaysian officials shows two red lines representing the possible locations from which Flight 370 sent its last hourly transmission to a satellite at 8:11 a.m. on March 8, more than seven hours after it took off from Kuala Lumpur's airport, and when the plane would most likely have been running low on fuel. Source: http://www.nytimes.com/2014/03/15/world/asia/malaysia-military-radar.html?_r=0 |
Detecting a Plane
Two kinds of radar are used to keep track of air traffic from the ground.
Primary radar
Sends out radio signals and listens for echoes that bounce back from objects in the sky.
Transponder
Secondary radar
Sends signals that request information from the plane’s transponder. The plane sends back information including its identification and altitude. The radar repeatedly sweeps the sky and interrogates the transponder. Other planes in flight can also receive the transponder signals.
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