Kolkata-based Sisir Radar Private Limited (Sisir) is a space technology startup co-founded by Tapan Misra, who is a retired Indian scientist and former director of the Space Applications Center- ISRO. Sisir Radar will make synthetic aperture radars (SAR) that can be fixed on drones for imaging smaller land areas.
For uninitiated, Synthetic aperture radar (SAR) refers to a technique for producing fine-resolution images from a resolution-limited radar system. SAR is a form of radar that is used to create two-dimensional images or three-dimensional re-constructions of objects, such as landscapes.
Sisir Radar, which has raised initial funds from angel investors, has got its name in memory of late Indian physicist Sisir K Mitra, who is known for his work in radio & wireless science and also a crater on the Moon is named after him.
Besides, in order to make drone technology affordable to the stakeholders of the farming sector, the government recently started offering grants and subsidies for drone purchases within the agriculture sector, making Sisir Radar more viable, cost effective and efficient for the farming sector.
Apart from fitting SARs onto drones, Sisir Radar will also be launching a constellation of 32 SAR satellites based on new technology so that the cost of good satellite images come down drastically from $ 60 per sq km.
Sisir will use drone-based SAR to get clearer and accurate images of smaller land areas in a small landscape use cases such as to measure agricultural farms and crops, in order to assess crop damage and others. These drone-fitted SARs can be used by state governments in the country.
It requires that the radar be moving in a straight line, either on an airplane or, as in the case of NISAR, orbiting in space.
In a statement to Indian Express, Tapan Misrasaid – “Initially we are developing a drone-based SAR. It will be a very high-resolution SAR which can provide very clear pictures even from low altitudes. I do not think there is anyone who is offering a drone-based SAR, because in the low atmosphere there is a lot of disturbance that interferes with the quality of the image. Usually, SARs are mounted on moving platforms like a reconnaissance aircraft or on satellites. “