IRNSS-1A is the first navigational satellite in the Indian Regional Navigation Satellite System (IRNSS) series of satellites been placed in geosynchronous orbit.
|Mission duration||10 years|
|Manufacturer||ISRO Satellite Centre|
Space Applications Centre
|Launch mass||1,425 kilograms (3,142 lb)|
|Dry mass||614 kilograms (1,354 lb)|
|Start of mission|
|Launch date||1 July 2013, 18:11 UTC|
|Launch site||Satish Dhawan FLP|
|Perigee altitude||35,706.1 km (22,186.7 mi)|
|Apogee altitude||35,882.7 km (22,296.5 mi)|
|Epoch||22 January 2015, 16:27:41 UTC|
The satellite has been developed at a cost of ₹1.25 billion (US$18 million), and was launched on 1 July 2013. It will provide IRNSS services to the Indian public, which would be a system similar to Global Positioning System (GPS) but only for India and the region around it.
Each IRNSS satellite has two payloads: a navigation payload and CDMA ranging payload in addition with a laser retro-reflector. The payload generates navigation signals at L5 and S-band. The design of the payload makes the IRNSS system inter-operable and compatible with GPS and Galileo. The satellite is powered by two solar arrays, which generate power up to 1,660 watts, and has a lifetime of ten years.
The satellite was launched from the Satish Dhawan Space Centre (SDSC) on 1 July 2013 at 11:41 PM (IST). The launch was postponed from its initial launch date of 26 June 2013 due to a technical snag in the 2nd stage of the PSLV-C22 launch rocket. ISRO then replaced the faulty component in the rocket and rescheduled the launch to 1 July 2013 at 11:43 p.m.
Scientists from the German Aerospace Centre (DLR)'s Institute of Communications and Navigation in Oberpfaffenhofen, Germany, have received signals from IRNSS-1A. On 23 July 2013, the German Aerospace Center scientists pointed their 30-meter dish antenna at Weilheim towards the satellite and found that it was already transmitting a signal in the L5 frequency band.
The three Rubidium atomic clocks on-board IRNSS-1A failed, with the first failure occurring in July 2016. ISRO planned to replace it with IRNSS-1H, in August 2017, but this failed to separate from the launch vehicle,  but on 12 April 2018, ISRO launched successfully IRNSS-1I as a replacement for IRNSS-1A.
The cause of failure was traced to one of the feed through capacitor carrying the DC supply to the physics package of clock, malfunctioning due to excessive rise in temperature.
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