isro

india to enter high speed internet era isro's satellites

A report from new delhi said that despite overtaking the us last year to become the world's second largest internet use base after china,
india is still behind many asian countries when it comes to internet
speed.but things are set to change in the next 18 months when indian space research organisation (ISRO) plan to  usher in an age of high-speed internet in the county with the launch of three communication satellites.

isro's chairman kiran kumar said that "we will launch three communication satellites. GSAT-19 IN JUNE  and GSAT-11 and GSAT-20 thereafter .GSAT-19 wiil be launched be GSLVMK III, isro's next generation launch vehicle boosted by an indigenous cryogenic engine that is capable of carrying a four-tonne satellite to the geosynchronous transfer orbit . these satellites will use multiple spot beams (a special kind of transponder that operates in a high frequency)  that will increase internet speed and connectivity. these multiple spot beams will cover the entire country.  "

A spot beam is a satellite signal that is specially concentrated (sent by a high-gain antenna located on the satellite) so that it covers only a limited geographic area in earth.

tapan misra,director of ahmedabad space application centre, told tol "these new satellites,once operational will 

be capable of providing high-quality internet,phone and video services.after this the effiective data rate if earlier-

launched GSAT satellites is one gigabyte per second. GSAT-19,on the other hand,will be able to transfer data at four gigabytes per second, thus making it equivalent to four satellites. this satellite will use eight beams."

"GSAT-11,which is heavier than GSAT-19,will be launched by the year-end and will use 16 beams. it will be able to transfer data at the rate of 13 gigabytes per second. GSAT-20,whose launch is set at the end of 2018,will use 40 beams. each beam will have two polarisations, which will effectively make them 80 beams. this satellite will have data rate of 60-70 gigabytes/sec