Everything about EMISAT: Electronic Intelligence Satellite, PSLV-C45 Mission

Headline : PSLV to launch military’s eye in the sky

Details :

The News

  • ISRO will launch India’s first electronic intelligence satellite, EMISAT onboard PSLV-C45.


PSLV-C45 Mission

  • PSLV-C45 mission, for the first time, will launch satellites in 3 different orbits
  1. EMISAT, electronic intelligence satellite in the low earth orbit, 749 km above the surface of the earth.
  2. 28 foreign satellites in the lower orbit of 504 km for USA, Lithuania, Spain and Switzerland.
  3. The PSLV PS-4, the 4th stage of the rocket, will be launched as orbital platform at a height of 485 km to provide a microgravity environment for research organisations and academic institutes to perform experiments. for the following experimental satellites:
    • ARIS (Advanced Retarding Potential Analyzer for Ionospheric Studies) satellite of Indian Institute of Space Science and Technology to study the structure and composition of ionosphere
    • Automatic Identification System (AIS) for Maritime satellite applications from ISRO
    • Amateur radio applications satellite ARPS (Automatic Packet Repeating System) from AMSAT (Radio Amateur Satellite Corporation) India
  • Besides, PSLV-C45 is the first mission that is using the QL variant of PSLV rocket launcher to launch satellites in 3 different orbits.



  • EMISAT is an electronic intelligence satellite based on ISRO’s Indian Mini Satellite -2 (IMS-2) bus platform.
  • The 435-kg EMISAT was developed under project KAUTILYA of Defence Electronics Research Laboratory of DRDO.
  • It is basically designed to intercept signals from enemy radars in order to develop effective jamming techniques to counter the enemy radar.
  • It will be launched in a highly elliptical orbit to maximize the dwell time over specific signal recording area.



  • Satellite-based electronic intelligence will augment the armed forces to counter radars.
  • Electronic Intelligence basically involves interception of signals from radars.
  • Once the signal is intercepted, the ELINT system collects data related to radar signals including its bandwidth, intensity, location from where it is emitted etc creating what is called a RF signature. (Radio frequency)
  • Once the RF signature is created it can be used for locating and identifying the radar in subsequent encounters.
  • It can also help in developing appropriate jamming techniques to counter the enemy radar.
Section : Science & Tech