India is launching the most powerful Earth Observation Satellite

ISRO is launching two earth observation satellites (EOS) naming GISAT-1 and RISAT-1A and these are EOS 3 and EOS 4 respectively.
GISAT-1 is going to be the world’s most powerful Earth Observation Satellite which will secure the borders on a Real-time basis.

GISAT-1

The GISAT-1 (Geo Imaging Satellite) will be India’s first Indigenous earth observation satellite that is going to be placed in geostationary orbit. This satellite will move with the rotation of the earth, so will look stationary
Its aim is to secure India’s borders in real-time.

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China’s Xian H-20 strategic stealth bomber- A Game Changer

Xian H-20 strategic stealth bomber with stealth features is the first dedicated bomber that is developed by China.
China became the third country in the world that has stealth technology for fighters after U.S. and Russia.
Now, this stealth bomber is a major concern for the security of India as this stealth bomber can easily move in the Indian region without being detected by the Indian RADAR system.

Xian H-20 Stealth Bomber of China resembles with the Strategic stealth bomber B-2 of US.
The US, in 1990s made a Strategic stealth bomber B-2, which is copied by China by making Xian H-20 Stealth Bomber.

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NISAR satellite| NASA ISRO Synthetic Aperture RADAR| What is Synthetic Aperture Radar| UPSC

In the 2019 surgical strike, the data from an ISRO satellite RISAT (RADAR Imaging Satellite) was very helpful. In these satellites, the special thing is that this RADAR can see everything in the ground and doesn’t matter it’s day or night, cloudy or sunny. This is called Synthetic Aperture Radar.

Optical satellites rely on sunlight being reflected back into the space from the ground. So they can not work in dark and also their view is obstructed by clouds. RADAR satellites send the radio signals and record the echo return. So they can take the image even at dark and image is not affected by clouds.

India’s first indigenous radar satellite was RISAT-1.

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