PPT On RADAR COMMUNICATIONS

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RADAR COMMUNICATIONS Presentation Transcript:
1.RADAR COMMUNICATIONS

2.RADAR – Radio Detection & Ranging
Radar is an Electromagnetic System for the detection and location of objects
Radar operates in microwave region
100MHz – 36 GHz, max up to 240GHz
3Operation    of Radar
Radar radiates energy into space and detect the echo signal reflected from an object/target.
Location and presence of the object both are detected by comparing the received echo signal with the signal that was transmitted.

3.It can operate in :
Darkness
Haze
Fog
Rain
Snow
Its ability to measure distances with high accuracy and in all weather is one of the major attributes.

4.Basic Principle of Radar Communication
Transmitter generates Electromagnetic signal (such as short pulse sine wave) radiated into space by an antenna.
Portion of the transmitted energy is intercepted by the target and re-radiates in many directions
The re-radiated directed back towards the radar is collected back by the radio antenna, which delivers it to the receiver.

5.If the target is in motion, there is a shift in the frequency of the echo signal due to Doppler effect.
The frequency shift is proportional to the velocity of the target relative to the radar
Doppler Effect:
A change in the observed frequency of a wave, as of sound or light, occurring when the source and observer are in motion relative to each other.
The frequency increases when the source and observer approach each other and decreases when they move apart.

6.Radar Applications
Military
Air Traffic Control
Ship Safety
Navigation