Chennai, Apr 11: The 32-hour countdown for the launch of 1,425 kg navigation satellite IRNSS-1I
by the indigenous rocket PSLV-C41 commenced at 2004 hrs in the spaceport of
Sriharikota on Tuesday night and has been progressing smoothly.
ISRO sources on Wednesday said, in its 43rd flight, the 44.4 m tall PSLV-C41, with a lift off mass of 321 tonnes, would soar into the skies from the First Launch Pad at 0404 hrs early tomorrow morning.
During the countdown propellant filling operations would be carried out in the four stage vehicle.
About 19 minutes after lift off, the 1,425 kg satellite, would be injected into the sub-Geosynchronous Transfer Orbit (Sub-GTO) at a perigee of 284 km and an apogee of 20,650 km, with an inclination of 19.2 deg to the equator.
After carrying out Orbit raising manouevres using the onboard propulsion systems, the satellite would be placed in the Geosynchronous Orbit at a height of 36,000 km with an inclination of 29 deg.
ISRO would be using the 'XL' version of PSLV for the mission.
This would be be 20th flight of PSLV-XL version and the 32nd PSLV mission from the First Launch Pad.
The Satellite, with a life span of ten years, would transmit signals for the determination of position, navigation and time.
It would be the ninth satellite in the Indian Regional Navigation Satellite System (IRNSS) segment.
It would also serve as a replacement for IRNSS-1A after its failure of its rubidium atomic clocks, which would provide accurate positional data.
Its predecessors, IRNSS-1A, 1B, 1C, 1D, 1E, 1F and 1G were launched by PSLV-C22, PSLV-C24, PSLV-C26, PSLV-C27, PSLV-C31, PSLV-C32 and PSLV-C33 in July 2013, April 2014, October 2014, March 2015, January 2016, March 2016 and April 2016 respectively.
The configuration of IRNSS-1I is similar to IRNSS-1A, 1B, 1C, 1D, 1E, 1F and 1G.
Like its other IRNSS predecessors, IRNSS-1I also carries two types of payloads--navigation payload and ranging payload.
The navigation payload of IRNSS-1I transmits signals for the determination of position, velocity and time.
This payload was operating in L5-band and S-band. Rubidium atomic clocks are part of the navigation payload of the satellite. The ranging payload of IRNSS-1I consists of a C-band transponder, which facilitates accurate determination of the range of the satellite.
It also carries Corner Cube Retro Reflectors for Laser Ranging.
It may be recalled the previous PSLV-C39/IRNSS-1H mission failed as the satellite did not get separated from the heat shield. UNI
ISRO sources on Wednesday said, in its 43rd flight, the 44.4 m tall PSLV-C41, with a lift off mass of 321 tonnes, would soar into the skies from the First Launch Pad at 0404 hrs early tomorrow morning.
During the countdown propellant filling operations would be carried out in the four stage vehicle.
About 19 minutes after lift off, the 1,425 kg satellite, would be injected into the sub-Geosynchronous Transfer Orbit (Sub-GTO) at a perigee of 284 km and an apogee of 20,650 km, with an inclination of 19.2 deg to the equator.
After carrying out Orbit raising manouevres using the onboard propulsion systems, the satellite would be placed in the Geosynchronous Orbit at a height of 36,000 km with an inclination of 29 deg.
ISRO would be using the 'XL' version of PSLV for the mission.
This would be be 20th flight of PSLV-XL version and the 32nd PSLV mission from the First Launch Pad.
The Satellite, with a life span of ten years, would transmit signals for the determination of position, navigation and time.
It would be the ninth satellite in the Indian Regional Navigation Satellite System (IRNSS) segment.
It would also serve as a replacement for IRNSS-1A after its failure of its rubidium atomic clocks, which would provide accurate positional data.
Its predecessors, IRNSS-1A, 1B, 1C, 1D, 1E, 1F and 1G were launched by PSLV-C22, PSLV-C24, PSLV-C26, PSLV-C27, PSLV-C31, PSLV-C32 and PSLV-C33 in July 2013, April 2014, October 2014, March 2015, January 2016, March 2016 and April 2016 respectively.
The configuration of IRNSS-1I is similar to IRNSS-1A, 1B, 1C, 1D, 1E, 1F and 1G.
Like its other IRNSS predecessors, IRNSS-1I also carries two types of payloads--navigation payload and ranging payload.
The navigation payload of IRNSS-1I transmits signals for the determination of position, velocity and time.
This payload was operating in L5-band and S-band. Rubidium atomic clocks are part of the navigation payload of the satellite. The ranging payload of IRNSS-1I consists of a C-band transponder, which facilitates accurate determination of the range of the satellite.
It also carries Corner Cube Retro Reflectors for Laser Ranging.
It may be recalled the previous PSLV-C39/IRNSS-1H mission failed as the satellite did not get separated from the heat shield. UNI
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