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PSLV-C27/IRNSS-1D Mission

PSLV C27 ISRO's Polar Satellite Launch Vehicle, PSLV C27, successfully placed the 1425 kg IRNSS-1D, the fourth satellite in the Indian Regional Navigation Satellite System (IRNSS), into the intended orbit on March 28, 2015 from Satish Dhawan Space Centre, SHAR, Sriharikota. In this twenty eighth consecutively successful mission, PSLV employed the 'XL' configuration. The same configuration of the vehicle was successfully used seven times on earlier occasions

The vehicle majestically lifted off at 1719 hrs IST from the Second Launch Pad of the Indian spaceport at Sriharikota. All the flight events took place precisely as planned. 19 minutes and 25 seconds after lift-off, the IRNSS-1D satellite got successfully separated from the fourth stage and was injected to an elliptical orbit of 282.52 km x 20644 km (very close to the intended orbit). After injection, the solar panels of IRNSS-1D were deployed automatically. ISRO's Master Control Facility (at Hassan, Karnataka) took over the control of the satellite. In the coming days, four orbit manoeuvres will be conducted from Master Control Facility to position the satellite in the Geosynchronous Orbit at 111.75 deg East longitude with 30.5 deg inclination.

IRNSS-1D is the fourth of the seven satellites constituting the space segment of the Indian Regional Navigation Satellite System. IRNSS-1A, 1B and 1C, the first three satellites of the constellation, were successfully launched by PSLV on July 02, 2013, April 04, 2014 and October 16, 2014 respectively. All the three satellites are functioning satisfactorily from their designated orbital positions.

IRNSS is an independent regional navigation satellite system designed to provide position information in the Indian region and 1500 km around the Indian mainland. IRNSS would provide two types of services, namely, Standard Positioning Services (SPS) - provided to all users - and Restricted Services (RS), provided to authorised users.

A number of ground stations responsible for the generation and transmission of navigation parameters, satellite control, satellite ranging and monitoring, etc., have been established in many locations across the country.

In the coming months, the next satellite in this constellation, namely IRNSS-1E, is scheduled to be launched by PSLV. The entire IRNSS constellation of seven satellites is planned to be completed by 2016.....


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