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PSLV-C24 right on its mission

The Indian Space Research Organisation had successfully launched Polar Satellite Launch Vehicle PSLV-C24 launched IRNSS-1B, the second satellite of the Indian Regional Navigation Satellite System on 4 April.

The launch took place from the First Launch Pad (FLP) of Satish Dhawan Space Centre, (SDSC) SHAR, Sriharikota. PSLV-C24 is using the XL version of PSLV. This is the sixth time XL configuration is being flown, the earlier five being PSLV-C11/Chandrayaan-1, PSLV-C17/GSAT-12, PSLV-C19/RISAT-1, PSLV-C22/IRNSS-1A and PSLV-C25/Mars Orbiter Spacecraft missions.

PSLV- C24 Stages at a Glance

PSLV- C24 Stages at a Glance
   Stage 1 Stage 2 Stage 3 Stage 4
Nomenclature Core PS1 +
6 strap-on motors
PS2 PS3 PS4
Propellant Solid
(HTPB Based)
Liquid
(UH25 + N2O4)
Solid
(HTPB Based)
Liquid
(MMH + MON-3)
Mass (Tonne) 138.0 (Core),
6X12(Strap-on)
41.7 7.6 2.5
Max Thrust (kN) 4819 (Core),
6X716(Strap-on)
804 240 7.3 X 2
Burn Time (sec)  101.5 (Core),
49.5(Strap-on)
 149  112.1  513
Stage Dia (m)  2.8 (Core),
1(Strap-on)
 2.8  2.0  2.8
Stage Length  (m)  20 (Core),
14.7(Strap-on)
 12.5  3.6  2.6

•    HTPB : Hydroxyl Terminated Poly Butadine
•    UH 25 : Unsymmetrical di-methyl hydrazine + 25% Hydrazine Hydrate
•    N2O4 : Nitrogen Tetroxide
•    MMH : Mono Methyl Hydrazine
•    MON-3 : Mixed Oxides of Nitrogen

IRNSS-1B’s predecessor, IRNSS-1A, was launched by PSLV-C22 in July 2013. IRNSS-1B has a lift-off mass of 1432 kg. The configuration of IRNSS-1B is similar to that of IRNSS-1A. The satellite has been realised in less than 7 months after the launch of its predecessor.

IRNSS -1B carries two types of payloads – navigation payload and ranging payload.The navigation payload of IRNSS-1B will transmit navigation service signals to the users. This payload will be operating in L5 band (1176.45 MHz) and S band (2492.028 MHz). A highly accurate Rubidium atomic clock is part of the navigation payload of the satellite. The ranging payload of IRNSS-1B consists of a C-band transponder which facilitates accurate determination of the range of the satellite. IRNSS-1B also carries Corner Cube Retro Reflectors for laser ranging.
Lift-off Mass: 1432 kg
Physical Dimensions: 1.58 metre x 1.50 metre x 1.50 metre
Orbit: Geosynchronous, at 55 deg East longitude with 29 deg inclination
Power: Two solar panels generating 1660 W, one lithium-ion battery of 90 Ampere-Hour capacity
Propulsion: 440 Newton Liquid Apogee Motor, twelve 22 Newton Thrusters
Control System: Zero momentum system, orientation input from Sun & star Sensors and Gyroscopes; Reaction Wheels, Magnetic Torquers and 22 Newton thrusters as actuators
Mission Life: 10 years
Launch date: 4 April 2014
Launch site: SDSC SHAR Centre, Sriharikota, India
Launch vehicle: PSLV – C24

This has been the rocket’s progress so far:
28 March:
•    Global checks are in progress
•    Heat Shield closed
•    IRNSS-1B spacecraft is integrated on PSLV-C24 launch vehicle
29 March:
•    Launch rehearsal checks are under progress
•    Global checks completed
1 April:
•    The 58 hrs and 30 minutes countdown is expected to start at 06:44 hrs (IST) on April 02, 2014
•    Pre countdown activities are in progress
•    Launch rehearsal completed successfully
2 April:
•    Countdown activity is progressing normally
•    MON3 Propellant filling operation of Fourth Stage (PS4) completed
•    MMH Propellant filling operation of Fourth Stage (PS4) completed
•    Propellant filling operation of Fourth Stage (PS4) has commenced
•    The 58 hrs and 30 minutes countdown of PSLV-C24/IRNSS-1B mission commenced at 06:44 hrs (IST)
3 April:
•    Countdown activity is progressing normally
4 April:
•    PSLV – C24 successfully launches IRNSS-1B from SDSC SHAR, Sriharikota
•    PSLV-C24 lifted off at 17:14 hrs (IST). Lift off normal
•    PSLV-C24/IRNSS-1B Mission ready for launch
•    Mobile Service Tower (MST) withdrawal to parking end completed
•    Propellant filling operation of Second Stage (PS2) completed
6 April:
•    Second orbit raising operation of IRNSS-1B is successfully completed by firing Apogee Motor for 790 seconds on afternoon of April 06, 2014. The expected orbital parameters are: Perigee Altitude: 349 km, Apogee Altitude: 35965 km
•    First orbit raising operation of IRNSS-1B is successfully completed by firing Apogee Motor for 460 seconds on evening of April 05, 2014. The orbital parameters are: Perigee Altitude: 297 km, Apogee Altitude: 24834 km, Inclination: 19.2 deg
7 April:
•    Third orbit raising operation of IRNSS-1B is successfully completed by firing the apogee motor for 2,096 seconds in morning. The expected orbital parameters are: Perigee altitude: 11,668 km, apogee altitude: 35,924 km, Inclination: 27°
8 April:
•    Fourth orbit raising operation of IRNSS-1B is successfully completed by firing the apogee motor for 1,270 seconds in afternoon. The expected orbital parameters are: Perigee altitude: 31,664 km, apogee altitude: 35,931 km, Inclination: 30.7°
9 April:
•    Fifth orbit raising operation of IRNSS-1B is successfully completed by firing Apogee Motor for 134.4 seconds in morning. The expected orbital parameters are: Perigee altitude: 35,328 km, apogee altitude: 35,931 km, Inclination: 30.9°
23 April:
•    IRNSS-1B satellite is successfully placed at 55 deg East longitude, collocated with IRNSS-1A and GSAT-8 satellites. IRNSS-1B satellite performance is normal.
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 as many as 15 locations across the country. Two more satellites of this constellation, namely, IRNSS-1C and IRNSS-1D, are planned to be launched in the second half of 2014. The entire IRNSS constellation of seven satellites is planned to be completed by 2015-16.

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