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.
• 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 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.
•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.