radar technology by premavani rajendra
TRANSCRIPT
We can learn many things from nature…
BATS - ECHOLOCATION
Bats are nocturnal animals
But they have very poor eyesight
They detect their prey/obstacles by echolocation
RADAR
TECHNOLOGY
Presented by
Mrs. Premavani Rajendra
Lecturer, Dept of Electronics,
Govt. Science College, Tumkur
What is a RADAR ? RADAR :RAdio Detection And
Ranging It is an electromagnetic
system for the detection and location of reflecting objects, such as aircraft, ships, spacecrafts, vehicles, people and the natural environment.
Invention of RADAR In 1887, a physicist named Heinrich Hertzbegan experimenting with radio waves in his laboratoryin Germany
Sir Robert Alexander
Watson-Watt (1892-1973):
Scottish physicist who developed the radar locating of aircraft in England.
Principle of Operation
A transmitter radiates electromagnetic signal into space by an antenna.
A portion of the transmitted
energy is intercepted by the target and re-radiated into many directions.
The re-radiation directed back towards the Radar is collected by the Radar Antenna which delivers it to a receiver.
There it is processed to detect the presence of the target and determine its location
RADAR Operation … EM waves are transmitted at the
target and echo waves are monitored.
Block Diagram of RADAR
Courtesy: Introduction to Radar – Merill Skolnik 3rd Edn
Radar Mixer
Radar Magnetron
Radar Antenna
Radar Amplifier
Primitive RADARS
This was the first surveillance radar system designed to detect objects in space by Federation of American Scientists (FAS)
Decca 41 – First Weather detecting Radar of Hong Kong Observatory in 1959
First Defense RADAR RADAR Monitoring Screen
TYPES OF RADARSurveillance Radar includes target detection, target recognition, target tracking and designation to a weapon system
Weapon –Control Radars track targets, direct the weapon to an intercept and asses the effectiveness of the battle damage assessment.
A Missile System Radar might employ Radar methods for guidance and fusing of the weapon
High resolution Imaging Radars, such as synthetic aperture Radar have been used for reconnaissance purposes and for detecting fixed and moving targets on the battle field.
Airborne Radars are mounted on the aero planes that allow the pilot to avoid hazardous weather conditions.
APPLICATIONS OF RADAR
Military: In air defense it performs the functions of surveillance and weapon control.
Remote Sensing: All Radars are remote sensors. They are used for weather observation, planetary observation, short range below-ground probing and mapping of sea ice to route shipping.
Air Traffic Control: They safely control the air traffic in the vicinity of airports as well as ground aircraft traffic.
Law Enforcement & Highway safety: The Radar speed meter is used by police for enforcing speed limits.
Space: Space vehicles use Radar for rendezvous and docking and landing on moon. They are employed for planetary exploration.
Entomologists & Ornithologists have applied Radar for the study of movements of insects and birds which cannot be easily achieved by other means.