Weighing 3,164 kg at lift-off, GSAT-15 is a high power satellite being inducted into the INSAT/GSAT system. According to ISRO - Indian Space Research Organisation  it carries a total of 24 communication transponders in Ku-band as well as a GPS-Aided GEO Augmented Navigation (GAGAN) payload operating in L1 and L5 bands.GSAT-15 is the 3rd satellite to carry GAGAN payload after GSAT-8 and GSAT-10, which are already providing navigation services from orbit. It also carries a Ku-band beacon as well to help in accurately pointing ground antennas towards the satellite.GSAT-15 will be the 19th payload launched by Arianespace for ISRO.

ISRO(Indian Reasearch Space Organization)
- The space research activities were initiated in our country during the early 1960’s.
- Dr. Vikram Sarabhai, the founding father of Indian space programme.
- Bhaskara-I & II missions were pioneering steps in the remote sensing area.
- Vision: to harness space technology for national development, while pursuing space science research and planetary exploration.
- Mission:
a. Design and development of launch vehicles and related technologies for providing access to space.
b. Design and development of satellites and related technologies for earth observation, communication, navigation, meteorology and space science.
c. Indian National Satellite (INSAT) programme for meeting telecommunication, television broadcasting and developmental applications.
d. Indian Remote Sensing Satellite (IRS) programme for management of natural resources and monitoring of environment using space based imagery.
e. Space based Applications for Societal development and Disaster Management Support.
f. Research and Development in space science and planetary exploration. 
- Achievements during 90's:
a. Indian National Satellite system (INSAT)
b. Indian Remote Sensing Satellite (IRS) system. 
c. Polar Satellite Launch Vehicle (PSLV) 
d. Geo-synchronous Satellite Launch Vehicle (GSLV).