In­dia’s first mil­i­tary satel­lite GSAT-7 launched


In­dia’s first de­fence satel­lite, GSAT-7, was suc­cess­fully launched by Euro­pean space con­sor­tium Ari­anes­pace’s Ari­ane 5 rocket from Kourou space­port in French Guiana re­cently, giv­ing a ma­jor push to the coun­try’s mar­itime se­cu­rity.

In­dian Navy will be the user of the multi­band home-built com­mu­ni­ca­tion satel­lite, ex­pected to be op­er­a­tional by Septem­ber end. The ` 185-crore GSAT-7 is the coun­try’s maiden ded­i­cated space­craft for de­fence ap­pli­ca­tions.

Af­ter a flight of al­most 34 min­utes, the satel­lite was in­jected into a geosyn­chronous trans­fer or­bit (GTO) of 249 km perigee (near- est point to earth), 35,929 km apogee (far­thest point to earth) and an in­cli­na­tion of 3.5 de­gree with re­spect to the equa­tor. Dur­ing Au­gust 31-Septem­ber 4, three or­bit-rais­ing op­er­a­tions will be per­formed by the In­dian Space Re­search Or­gan­i­sa­tion (ISRO) to place the satel­lite into geo­sta­tion­ary or­bit of 36,000 km above the equa­tor. By Septem­ber 14, GSAT-7 is planned to be po­si­tioned in its or­bital slot of 74 de­gree East lon­gi­tude and sub­se­quently the satel­lite’s com­mu­ni­ca­tion transpon­ders will be switched on.

The fre­quency bands of GSAT-7 will help space-based marine com­mu­ni­ca­tions. It has cov­er­age over In­dia land­mass as well as sur­round­ing seas. “It’s im­por­tant from se­cu­rity and sur­veil­lance points of view”, an ISRO of­fi­cial said.

GSAT-7 is an ad­vanced com­mu­ni­ca­tion satel­lite to pro­vide wide range of ser­vice spec­trum from low bit rate voice to high bit rate data com­mu­ni­ca­tion. Its pay­load is de­signed to pro­vide com­mu­ni­ca­tion ca­pa­bil­i­ties to users over a wide oceanic re­gion in­clud­ing the In­dian land mass. The launch cost for ISRO is around ` 470 crore, in­clud­ing in­sur­ance.

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