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== RISAT 2 ==
== RISAT 2 ==
{{main|RISAT-2}}
{{main|RISAT-2}}
RISAT-2 was the first of the RISAT series to reach orbit.<ref name="ASM News">{{cite web|url=http://www.asmmag.com/news/risat-2-launched|title=Risat-2 Launched|publisher=ASM|accessdate=2009-03-22}}</ref> It was launched successfully on April 20, 2009 at 0015 hours GMT by a [[PSLV]] rocket. The 300-kg satellite was built by ISRO using a X-band SAR manufactured by IAI.<ref name="CNN">{{cite news|url=http://edition.cnn.com/2009/WORLD/asiapcf/03/21/india.satellite/|title=India to launch Israel-backed satellite|publisher=[[CNN]]|accessdate=2009-03-22 | date=2009-03-21}}</ref><ref>http://www.iai.co.il</ref><ref name="PTI">{{cite news|url=http://www.ptinews.com/pti\ptisite.nsf/0/891057F482233D216525757F0035CFA6?OpenDocument |title=India set to launch imaging satellite with Israeli support |date=20 Mar 2009 |publisher=PTI |accessdate=2009-03-22 }}{{dead link|date=May 2016|bot=medic}}{{cbignore|bot=medic}}</ref>
RISAT-2 was the first of the RISAT series to reach orbit.<ref name="ASM News">{{cite web|url=http://www.asmmag.com/news/risat-2-launched|title=Risat-2 Launched|publisher=ASM|accessdate=2009-03-22|deadurl=yes|archiveurl=https://web.archive.org/web/20090424210905/http://www.asmmag.com/news/risat-2-launched|archivedate=2009-04-24|df=}}</ref> It was launched successfully on April 20, 2009 at 0015 hours GMT by a [[PSLV]] rocket. The 300-kg satellite was built by ISRO using a X-band SAR manufactured by IAI.<ref name="CNN">{{cite news|url=http://edition.cnn.com/2009/WORLD/asiapcf/03/21/india.satellite/|title=India to launch Israel-backed satellite|publisher=[[CNN]]|accessdate=2009-03-22 | date=2009-03-21}}</ref><ref>http://www.iai.co.il</ref><ref name="PTI">{{cite news|url=http://www.ptinews.com/pti\ptisite.nsf/0/891057F482233D216525757F0035CFA6?OpenDocument |title=India set to launch imaging satellite with Israeli support |date=20 Mar 2009 |publisher=PTI |accessdate=2009-03-22 }}{{dead link|date=May 2016|bot=medic}}{{cbignore|bot=medic}}</ref>


This satellite was fast tracked in the aftermath of the 2008 Mumbai attacks.<ref name=ASM>{{cite web|url=http://www.asmmag.com/news/india-to-launch-risat|title=The difference between Risat-1 and Risat-2|publisher=ASM|accessdate=2009-03-25|deadurl=yes|archiveurl=https://web.archive.org/web/20100912231400/http://www.asmmag.com/news/india-to-launch-risat|archivedate=2010-09-12|df=}}</ref> The satellite will be used for border surveillance, to deter insurgent infiltration and for anti-terrorist operations.<ref name="timesofindia.indiatimes.com">{{cite news| url=http://timesofindia.indiatimes.com/articleshow/4374544.cms | work=The Times Of India | title=India to launch spy satellite on April 20 | date=2009-04-08}}</ref> It is likely to be placed under the [[Indian Air Force#Aerospace Command|Aerospace Command]] of the [[Indian Air Force]].<ref>http://news.xinhuanet.com/english/2009-02/13/content_10815093.htm</ref>
This satellite was fast tracked in the aftermath of the 2008 Mumbai attacks.<ref name=ASM>{{cite web|url=http://www.asmmag.com/news/india-to-launch-risat|title=The difference between Risat-1 and Risat-2|publisher=ASM|accessdate=2009-03-25|deadurl=yes|archiveurl=https://web.archive.org/web/20100912231400/http://www.asmmag.com/news/india-to-launch-risat|archivedate=2010-09-12|df=}}</ref> The satellite will be used for border surveillance, to deter insurgent infiltration and for anti-terrorist operations.<ref name="timesofindia.indiatimes.com">{{cite news| url=http://timesofindia.indiatimes.com/articleshow/4374544.cms | work=The Times Of India | title=India to launch spy satellite on April 20 | date=2009-04-08}}</ref> It is likely to be placed under the [[Indian Air Force#Aerospace Command|Aerospace Command]] of the [[Indian Air Force]].<ref>http://news.xinhuanet.com/english/2009-02/13/content_10815093.htm</ref>

Revision as of 16:19, 29 January 2018

RISAT (Radar Imaging Satellite) (

synthetic aperture radars
(SAR).

The RISAT series are the first all-weather earth observation satellites from ISRO. Previous Indian observation satellites relied primarily on optical and spectral sensors which were hampered by cloud cover.

After the November 26,

TecSAR
.

RISAT 2

Main article: RISAT-2

RISAT-2 was the first of the RISAT series to reach orbit.

PSLV rocket. The 300-kg satellite was built by ISRO using a X-band SAR manufactured by IAI.[2][3][4]

This satellite was fast tracked in the aftermath of the 2008 Mumbai attacks.[5] The satellite will be used for border surveillance, to deter insurgent infiltration and for anti-terrorist operations.[6] It is likely to be placed under the Aerospace Command of the Indian Air Force.[7]

No details of the technical specifications of RISAT-2 have been published. However, it is likely to have a spatial resolution of about a metre or so. Ship detection algorithms for radar satellites of this class are well-known and available. The satellite also has applications in the area of disaster management and agriculture-related activities.[6]

RISAT 1

Main article: RISAT-1

RISAT-1 is an indigenously developed radar imaging satellite successfully launched by a PSLV-XL rocket on April 26, 2012 from Satish Dhawan Space Centre, Shriharikota. RISAT-1 was postponed in order to prioritize the building and launch of RISAT-2.[5][8][9][10]

The features of RISAT-1 include:

  • 160 x 4 Mbit/s data handling system
  • 50 Newton-meter-second reaction wheels
  • SAR antenna deployment mechanism
  • Phased array antenna with dual polarisation

References

  1. ^ "Risat-2 Launched". ASM. Archived from the original on 2009-04-24. Retrieved 2009-03-22. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  2. ^ "India to launch Israel-backed satellite". CNN. 2009-03-21. Retrieved 2009-03-22.
  3. ^ http://www.iai.co.il
  4. ^ "India set to launch imaging satellite with Israeli support". PTI. 20 Mar 2009. Retrieved 2009-03-22.[dead link]
  5. ^ a b "The difference between Risat-1 and Risat-2". ASM. Archived from the original on 2010-09-12. Retrieved 2009-03-25. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  6. ^ a b "India to launch spy satellite on April 20". The Times Of India. 2009-04-08.
  7. ^ http://news.xinhuanet.com/english/2009-02/13/content_10815093.htm
  8. ^ "ISRO's New Satellite Could See Through Even Cloudy Sky". Indo Daily. November 7, 2008. Archived from the original on May 20, 2011. Retrieved 2009-03-21. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  9. ^ Launch Info Archived 2009-05-22 at the Wayback Machine
  10. ^ "Earth Observation System". ISRO. Archived from the original on October 10, 2008. Retrieved 2009-03-21. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
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