Sunday, March 29, 2015

India Successfully Launches IRNSS-1D Navigation Satellite

PSLV-C27 launches with IRNSS-1D satellite on Mar. 28, 2015. Credit: ISRO

ISRO's Polar Satellite Launch Vehicle, PSLV-C27, successfully launched the 1425 kg IRNSS-1D, the fourth satellite in the Indian Regional Navigation Satellite System (IRNSS) on Saturday (Mar. 28, 2015) at 5:19 p.m. (local time) from Satish Dhawan Space Centre SHAR, Sriharikota. This is the twenty eighth consecutively successful mission of the PSLV. The 'XL' configuration of PSLV was used for this mission. Previously, the same configuration of the vehicle was successfully used seven times. “We will now be able to make use of our receivers to locate ourselves independently,” ISRO Chairman A.S. Kiran Kumar said. This is the first launch this year and the first under his chairmanship.

After the PSLV-C27 lift-off from the Second Launch Pad with the ignition of the first stage, the subsequent important flight events, namely, strap-on ignitions and separations, first stage separation, second stage ignition, heat-shield separation, second stage separation, third stage ignition and separation, fourth stage ignition and satellite injection, took place as planned. After a flight of about 19 minutes 25 seconds, IRNSS-1D Satellite was injected to an elliptical orbit of 282.52 km X 20,644 km (very close to the intended orbit) and successfully separated from the PSLV fourth stage.

Indian Prime Minister Narendra Modi congratulated scientists for the successful launch of IRNSS-1D satellite. He said "it is yet another manifestation of their exemplary efforts."



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.

PSLV mission director P Kunhikrishnan said, "The orbit achieved is excellent. We achieved 20, 644km apogee against the targeted 20,650km and reached a perigree of 282.5km against the 284km planned. This process was well within the specification and better than planned."

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.

IRNSS-1D satellite. Credit: ISRO
IRNSS-1D satellite. Credit: ISRO

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 of 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.

Vikram Sarabhai Space Centre director M Chandraduthan said that 2015 was going to be a critical year as five launches including three PSLV and one GSLV D6 are planned. "There will also be a demonstration of a reusable technology for launch vehicle. One third of ISRO is youngsters which show that the future is bright," he added.

Credit: ISROindiatimes.com

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