Chandrayaan-I - ISRO's prestigious mission to moon plan

Very informative....

Mission Sequence
The spacecraft would be launched by PSLV-XL in a highly elliptical transfer orbit with perigee of about 240 km and an apogee of about 24,000 km. Later, the spacecraft would be raised to moon rendezvous orbit by multiple in-plane perigee maneuvers. These maneuvers would help to achieve the required 3,86,000 km apogee of the Lunar Transfer Trajectory (LTT).

After a quick estimate of the achieved LTT a mid-course correction will be imparted at the earliest opportunity. The spacecraft coasts for about five and a half days in this trajectory prior to the lunar encounter. The major maneuver of the mission, called Lunar Orbit Insertion (LOI) that leads to lunar capture, would be carried out at the peri-selene (nearest point in lunar orbit) leading to successful lunar capture in a polar, near circular 1000 km-altitude orbit.

After successful capture and health checks, the altitude is planned to be lowered through a series of in-plane corrections to achieve the target altitude of 100 km circular polar orbit.






MIP (Moon Impact Probe) Separation



NB: For animated view of the same, visit ISRO website. Sorry couldnt post the animated view here as I could not upload .swf files to photobucket(available only for pro members)


The Spacecraft

Spacecraft for lunar mission is :

1. Cuboid in shape of approximately 1.50 m side.
2. Weighing 1304 kg at launch and 590 kg at lunar orbit.
3. Accommodates eleven science payloads.
4. 3-axis stabilized spacecraft using two star sensors, gyros and four reaction wheels.
5. The power generation would be through a canted single-sided solar array to provide required power during all phases of the mission. This deployable solar array consisting of a single panel generates 700W of peak power. Solar array along with yoke would be stowed on the south deck of the spacecraft in the launch phase. During eclipse spacecraft will be powered by Lithium ion (Li-Ion) batteries.
6. After deployment the solar panel plane is canted by 30? to the spacecraft pitch axis.
7. The spacecraft employs a X-band, 0.7m diameter parabolic antenna for payload data transmission. The antenna employs a dual gimbal mechanism to track the earth station when the spacecraft is in lunar orbit.
8. The spacecraft uses a bipropellant integrated propulsion system to reach lunar orbit as well as orbit and attitude maintenance while orbiting the moon.
9. The propulsion system carries required propellant for a mission life of 2 years, with adequate margin.
10. The Telemetry, Tracking & Command (TTC) communication is in S-band frequency.
11. The scientific payload data transmission is in X-band frequency.
12. The spacecraft has three Solid State Recorders (SSRs) on board to record data from various payloads.

• SSR-1 will store science payload data and has capability of storing 32Gb data.
• SSR-2 will store science payload data along with spacecraft attitude information (gyro and star sensor), satellite house keeping and other auxiliary data. The storing capacity of SSR-2 is 8Gb.
• M3 (Moon Mineralogy Mapper) payload has an independent SSR with 10Gb capacity.

Presented below are a graphical view of the spacecraft from various angles displaying its various scientific payloads. (Click on the images for an enlarged view)
View 1:...............................View 2:...............................View 3:


View 4:...............................View 5:...............................


A fully blown out view of the spacecraft:




GROUND SEGMENT FOR CHANDRAYAAN-1 MISSION

Ground Segment for Chandrayaan-1 comprises three major elements viz. Deep Space Station (DSN), Spacecraft Control Center (SCC) and Indian Space Science Data Center (ISSDC).

This trio of ground facility ensures the success of the mission by providing to and fro conduit of communication, securing good health of the spacecraft, maintaining the orbit and attitude to the requirements of the mission and conducting payload operations.

The ground segment is also responsible for making the science data available for the Technologists / Scientists along with auxiliary information, in addition to storage of payload and spacecraft data.



Scientific Payloads (Up next)

hmmm u rock!! this was a gud one

it has been launched today successfully...proud of India

Wow man, that was informational. Launch was a great success. it carries many other satlites too

good one ketto, thanks for it

Re: Chandrayaan-I - ISRO's prestigious mission to moon plan

indiakkaar chandranil ethiya pattu