RADAR-Radio Detection And Ranging

Electromagnetic Waves

Microwave frequency band

Before world war-II

Target

Detection Result

No No correct

Yes Yes Correct

Yes No Error

No Yes Error( False Alarm )

R=c*Tp/2 (meters)

Where,

R = range to target(meters)

Tp = round-trip propagation time(seconds)

c = the propagation velocity(m/s)

Enforcing speed limits

Collisions