Department of Space , Government of India provide different types of fellowship opportunities like JRF , SRF , PDF or Research Associate .
PRL or Physical Research Laboratory takes application for Junior Research Fellowship or JRF in Astronomy and Astrophysics, Geosciences and Theoretical Physics, They are also encouraged to register for Ph.D at an University or Institution with which they have MoU. PRL also offers PDF or Post Doctoral Fellowship.
SPL or Space Physics Laboratory takes JRF almost throughout the year. They provide research opportunities in Atmospheric, Space and Planetary Sciences.
IIST or Indian Institute of Space Technology takes PDF or Post Doctoral Fellowship for the research in Aerospace Engineering, Avionics, Chemistry and Physics.
NARL or National Atmospheric Research Laboratory offers PDF or Research Associate or RA.
URSC also offers fellowship.
SAC or Space Application Centre takes application for Research Fellowship, Research Associateship, Research Scientist in specific projects or Education or Research Schemes. They also collaborate with different universities or institutions for research activities.
For details you can visit website isro.gov.in