A satellite, two radars … will do x-rays of the earth nisar, for the first time with L-band and S-band; Know his double power last updated: July 31, 2025, 14:44 IST Nisar Satellite Radar: India and America’s shared satellite nisar is now present in the polar lane. Nisar means Nasa-Isro synthetic diaphragm satellite. It was introduced in space on July 26 from ISRO’s GSLV-F16 rocket. This satellite now moves around the earth 745 km above. But the question is what will this satellite do? Why is it called a Gamechanger? And what is special in this that is not in other satellites? Nisar is a double bandradar satellite. It has two synthetic diaphragm radar (SAR). L-band Sar Joe Nasa gave. It can also scan thick bushes, forests and icy glaciers. It also has S-band SAR which is from Isro. It can take a high-government image of fields, cities and coastal areas. L and S tires work together in one satellite for the first time. This means that Nisar can take clear photos in any season, day or night. What will Nisar see? This will tell us how the glaciers melt, where cracks come into the soil, floods and landslides, crops, urban development, climate change effect … will give information about everyone. This satellite will constantly monitor the entire planet. With this information, scientists will be able to guess in advance natural disasters. Normal radars only send microwaves and measure the timing of their return. It gives a great idea that is ahead. But SAR (synthetic diaphragm radar) technology goes a step further. In this, the satellite continues and sends each moment signals from different angles. If these signals return, the computer makes it a very clean and detail image by mixing them. The simple radar would need a very large antenna, such as 19 kilometers wide for the cleanup he wants! But SAR works that big antenna with small antenna and computer processing. Nisar’s radarantenna is 12 meters long, that is, a city bus as much as. But due to SAR processing, it can create a clean image as a 19 km broad antenna. When the satellite itself revolves around the earth, it creates a big picture by adding data from each of its positions. Like a camera scan a complete landscape. Two special images meet SAR. 1. Interferogram: If two SAR statues are taken from the same place – at different times – and it is mixed, the slight movement of the soil also comes into catch. With this, earthquake, glaciers movement and landslides can be detected. 2. POLARIMETRY: This technique can be understood how a surface is. The shade of trees, buildings, fields … all can be identified. After flooding or storms, the loss is also measured from it. The biggest feature of SAR is that it can see outside the clouds. It also works at night. Enter data in each season. Constantly monitor the same place. Therefore, this technique is very important for environment, farming, disaster management and climate study. Nasa scientist Charles Elachi says: ‘SAR can understand things very carefully’. Home knowledge snow, forest, earthquake or flood … nisar will do x-rays, double tire radar installed in it
Snow, forest, earthquake or flood … nisar will do x-rays, a double band radar in it
