It is the acronym of RAdio Detection And Ranging. Radar is one of the applications of microwave.It is used to detect objects located at long distances ,which cannot be observed visually.
R.F signal at high frequency gets reflected by the conducting the medium.
The electromagnetic signal travels approximately at the speed of light.
This signal travels in a straight line and it is used to find the direction of the reflecting object.
COMPONENTS OF RADAR :
The basic radar has 4 components...
Transmitter creates the pulse energy.
A transmitter/receiver switch indicates the antenna when to transmit and receive signals.
An antenna to transmit and an antenna to receive is used.
A Receiver detects,amplifies and transforms the signal into a visual format.
RANGE MEASUREMENT :
In general velocity(v) = distance(d) / time(t) and distance(d) = velocity(v) * time(t).The Range is actually the distance . Range = C * time / 2.The time is actually the round trip time to and from the target and only half the time is needed.
BASIC RADAR TYPES :
TYPES OF RADARS BY ATC :
Precision Approach Radar (PAR).
Air Route Surveillance Radar (ARSR).
Airport Surface Detection Equipment (ASDE).
Airport Surveillance Radar (ASR).
USES OF RADAR :
Ground Penetration Radar is used for archeological purposes.
Weather radar can be used to measure wind speeds.Air traffic radars can be used to detect aircraft.