Isro plans to launch four to five advanced Risat-series satellites, of which one was launched on May 22 this year and the third one (Risat-2BR2) after Risat-2BR1 will be launched in the second half of this month. “At least four Risat satellites in space are required for security forces to keep surveillance on a particular spot on a daily basis,” a source in Isro said.

Source: Isro to launch another ‘eye in the sky’ in Dec