20 May, 2020
10 Min Read
Doppler Weather Radar
Extremely severe Cyclone Amphan very likely to move north-northeastwards across northwest Bay of Bengal and cross West Bengal – Bangladesh coasts between Digha (West Bengal) and Hatiya Islands (Bangladesh) close to Sundarbans during Afternoon to Evening hours of 20th May 2020 with maximum sustained wind speed of 155-165 kmph gusting to 185 kmph.
The system is now being continuously tracked by the Doppler Weather Radar (DWR) at Vishakhapatnam (Andhra Pradesh), Paradip (Odisha) and Gopalpur (Odisha).
About Doppler Weather 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.
What is 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.
What is Doppler Radar?
Doppler radar is a specific radar that uses the Doppler principle to produce relative motion data about objects at a distance.
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:
Doppler Weather Radar (DWR) by ISRO
Polarimetric Doppler Weather Radar
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