Science and technology : Doppler Radar
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DOPPLER RADAR

What is Radar :-

• Radar (Radio Detection and Ranging) 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 Principle:- 

• 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.

 Doppler Radar:- 

• Doppler radar is a specific radar that uses the Doppler principle to produce relative motion data about objects at a distance.

  1. Indian Doppler Radar: –

• Also known as INDRA series of 2D Radars and developed by DRDO for the use of Airforce and the Army. Some have been even exported to Sri Lanka.

INDRA-1:- Is low-level target detection mobile surveillance radar.

INDRA 2:- Is a modified version of INDRA radar for ground controlled interception of targets. 

• It uses pulse compression to detect low flying aircraft.

Application of Doppler Radars:-

•Aviation,

•Sounding satellites

•Meteorology

•Radar guns

•Radiology and healthcare

•Nursing or clinic purpose

•Bistatic radar (surface-to-air missile)

• Doppler Weather Radar (DWR) by ISRO.

• For improving weather forecasting services.

• The DWR will help in rainfall estimation and detect thunderstorm, cyclones and other severe weather events within a radius of 400 km.

• DWR has the equipment to measure rainfall intensity, wind shear and velocity and locate a storm centre and the direction of a tornado or gust front.

• Based on Doppler principle the radar is designed to improve precision in long-range weather forecasting and surveillance using a parabolic dish antenna and a foam sandwich spherical radome.

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