Friends today Indian Space Programme is going to achieve another new height in the service of the nation.

What will happen today ?
Today at 11.41pm First of Seven  Indian Regional Navigation Satellite System (IRNSS) 1-A weighing 1425 Kg will launch from Satish Dhawan Space Centre at Sriharikota to reach 501 Km altitude in 20 Mins 42 Seconds after lift off.

What is vehicle used for launch for this mission ? Was XL version used earlier ? 
the XL version of PSLV is being used for launch of  this mission named as  PSLV C22.This fourth time ISRO is using this.
In the past XL version was used 3 times i.e. in launch of PSLV C11, CHANDRAYAAN - I , PSLV C17/GSAT 12 & PSLV - C19/RISAT

Why it is launched in the night time? Is it first time ? 
Yes this is first time any launch of satellite is taking place from India in the night. However ISRO scientists said Orbital Parameters and Inclination determine the time of a launch.

What are the payloads of IRNSS ?
i. Navigation Payload : which provides navigation service signals to users .
 It works in L5 Band (1176. 45 mHz) and S Band (2492.028 mHz)
 it also has highly Accurate Rubidioum Atomic Clock.

ii. Ranging Payload : this consists of C-Band Transponder which helps accurate range determination.
IRNSS also carries Corner Cube Retro Reflectors for Laser Ranging

What is the use/Applications of IRNSS ? 
The IRNSS will be helpfull
 i. Terrestrial, Aerial and Marine Navigation
ii. Disaster Management
iii. Vehicle tracking and fleet management
iv. Integration with mobile phones
v. Precise Timing
vi. Mapping and Geodetic data capture
vii. Terrestrial navigation aid for hikers and travellers
viii. Visual and voice navigation for drivers
ix. Many more Location Based Services  (LBS) with innovative use/purpose will be available soon for people.

What are the highlights of IRNSS ? 
Its India's own independent Regional Navigational Satellite System consisting a constellation of  7 satellites (1 will be launched today). It Provides accurate position information service to users. It covers entire country and has coverage facility 1500 km beyond borders of India.

What kinds of Services Does IRNSS provide ?
There are two types of services provided by IRNSS by transmitting signals in two Microwave Frequency bands known as L5 & S band they are
1. Standard Positioning Service (SPS) is available to all civilian purposes. whereas special receivers are required for usage which are being developed by ISRO with help of Industry.  
2. Restricted Service (RS) for all Military operations only.

How many Stages does PSLV - C22 consist off ?  What kind of fuel is used ? 
There are four Stages in PSLV
Stage 1 Known as Core Stage PS 1 + 6 Strap-on Motors. In this stage Solid Fuel is used.
Stage 2 Known as PS2 In this stage Liquid Fuel is used.
Stage 3 known as PS3 in this Stage Solid Fuel is Used.
Stage 4 known as PS4 in this stage Liquid Fuel is Used.
When will be other satellites of IRNSS will be launched ? 
The remaining Six Satellites is expected to be placed in orbit by 2015

 How will the 7 Satellites orbit and work ?
Three among them will be located at Equator (Geo Stationary Orbit). i.e. Satellites placed in Geo Stationary Orbit match Earth Rotation therefore appear fixed in the sky as from Ground.

Four remaining satellites will be in pairs of Two orbiting in inclined Geo Synchronous Orbits .i.e. from ground it will appear they travel in figure 8 around earth during course of a Day.

Why does India need a independent navigation system ?
Advent of Location Based Services (LBS) are being seen as great advancement of Civilian uses for various purposes and also seen as Billion Dollar market.
Military Operation rely heavily on Satellite navigation. Importantly India is going for modernisation of its armed forces.

Learning from global experiences. European Commission Europ's independence is essential in this sector is critical for its economy. Hence they are for Galileo Global system much to annoyance of USA.

In Iraq war its reportedly understood that US degraded accuracy of the freely accessible GPS  signals posting an advantage.
Here is video which explains the importance of this mission.

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