it is India's first missile range instrumentation ship
however ships of this type are also used for snooping
1.underwater (hydrographic studies , mapping etc etc)
2.above water (SIGNIT , tracking airborne objects within atmosphere and in space etc etc)
and as usual most of its capabilities and roles are classified (since this project is handled by PMO).
More than it, its actually a missile tracking ship,
Only United States, Russian Federation, People's Republic of China and France operate such ships before India.