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The PS4 is the last stage of the Polar Satellite Launch Vehicle (PSLV) rocket, which until now used to go waste after putting the spacecraft into the desired orbit. ISRO, in the last two attempts tried to keep PS4 alive in space, and was successful. As the next step, it has now called for experiments from national and international institutions. The experiments will cover six areas, including space docking
“The PS4-Orbital Platform (PS4-OP) refers to a novel idea formulated by ISRO to use the spent PS4 stage (fourth stage of PSLV) to carry out in-orbit scientific experiments for an extended duration of one to six months. The advantage being the stage has standard interfaces & packages for power generation, telemetry, tele-command, stabilization, orbit keeping & orbit maneuvering,” Isro said on Saturday.
All of this is engineering research, finding ways to operate in space effectively. More important, they are doing what SpaceX does, letting their commercial operations pay for their research and development. Rather than fly separate missions to do these engineering experiments, they will let their commercial customers pay for it.