Centre grants doppler weather radar to Bengaluru

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Working Principle:

A Doppler Weather Radar (DWR) consists of following components:

1. RF transmitter: It generate high power microwave radiation in pulses.

2. Antenna: It sends the signal out to space and to receive scattered energy (echoes) from targets around

3. servo system to move the antenna in a planned schedule scan, 

4. Receiver to detect and process the received echo signals and a 

5. Display unit to graphically present the signal in user understandable form. 

Magnetrons, klystrons and travelling wave tubes still continue to be the main RF oscillators of most radar transmitters.

Major advantages of Doppler Weather Radar (DWR) include: 

  1. Wind speed measurement during rainfall and thunderstorms which was not possible in conventional weather radar. Thus, the DWR helps to provide improved warnings. 
  2. Better estimation of rainfall with detection of heavy rainfall events and generation of warnings. 
  3. Additional inputs to numerical weather prediction models for generating improved weather forecasts particularly nowcast (forecast for a few hours). 
  4. Weather radars can provide area specific rainfall and storm warnings which is beneficial for aviation related services, disaster management and emergency response authorities. 
  5. In conjunction with data from other sensors such as satellites, better forecasts and warnings can be achieved leading to better services towards public safety and socioeconomic benefits.
India Meteorological Department, IMD Pune, Times of India

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