"First orbit raising operation of IRNSS-1D is successfully completed by firing the Apogee motor at 17.28 hours on March 29, 2015," Isro said on its website.
Indian Space Research Organisation successfully launched the IRNSS-1D, the fourth in the series of seven navigation satellites, on board its workhorse PSLV-C27 from the spaceport of Sriharikota near here on Saturday.
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While four satellites would be sufficient to start operations of the IRNSS system, the remaining three would make it more accurate and efficient.
Isro plans to launch the remaining three navigation satellites IRNSS-1E, 1F and 1G before the end of the next financial year.
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