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radar
ASDIC
It's called a "Motion Detector"!
Radar
Its called that Climbing - in relationship to just after takeoff it's called "climbing out"
e-nose
One way to measure airspeed is to use a device called a pitot tube.
None. The megapixels are in the detecting device. e.g. a camera, a CCD device.
A Passive InfraRed Sensor (PIR)
The Piranah Water 3000
Alexander Popov was one of the first to create a radar device. His device, created in 1895, was meant for detecting lightning strikes.
IFF (identification of friend and foe device) will detect the enemy aircraft. Radar system also plays role in this operation.