GSAT-4 was the nineteenth geo-stationary satellite of India built by ISRO and fourth in the GSAT series. GSAT-4 was basically an experimental satellite with the following new technologies intended to be tested:

• Electric Propulsion System
• Bus Management Unit
• 1553 Bus for Data Communication
• Miniaturised Dynamically Tuned Gyros
• 36 AH Lithium Ion Battery
• 70 V Bus for Ka band TWTAs 

However, GSAT-4 was not placed in orbit as GSLV-D3 could not complete the mission