Daily Current Affairrs Update: 28 JAN 2023

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Doppler Weather Radar Network

  • On the Occasion of 148th Foundation Day of India Meteorological Department (IMD), the Ministry of Earth Science has inaugurated the Doppler Weather Radar (DWR) Systems in Jammu & Kashmir, Uttarakhand, and Himachal Pradesh.

What are Doppler Weather Radars?

  • The radar is designed to improve precision in long-range weather forecasting and surveillance.
  • DWR has the equipment to measure rainfall intensity, wind shear and velocity and locate a storm centre.

What is Radar?

  • Radar (Radio Detection and Ranging):
    • It is a device which uses electromagnetic waves in the microwaves region to detect location (range & direction), altitude, intensity and movement of moving and non-moving objects.

Doppler Radar:

  • It is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance
    • Doppler effect: When the source and the signal are in relative motion to each other there is a change in the frequency observed by the observer. If they are moving closer, frequency increases and vice versa.
    • It does this by bouncing a microwave signal off a desired target and analyzing how the object’s motion has altered the frequency of the returned signal.
    • This variation gives direct and highly accurate measurements of the radial component of a target’s velocity relative to the radar.

Types Of Doppler Radars:

  • Doppler radar can be divided into several different categories according to the wavelength which are L, S, C, X, K.

X band radars:

  • They operate on a wavelength of 2.5-4 cm and a frequency of 8-12 GHz. Because of the smaller wavelength, the X band radar is more sensitive and can detect smaller particles.
  • These radars are used for studies on cloud development.
  • X-band radars also attenuate (become less effective) very easily.
  • Due to the small size of the radar, it can therefore be portable like the Doppler on Wheels (DOW).

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