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RISAT-2, or Radar Imaging Satellite-2 was an Indian radar imaging reconnaissance satellite that was part of India's RISAT programme. It was built by Indian Space Research Organisation (ISRO) and successfully launched aboard a PSLV-CA launch vehicle at 01:15:00 UTC on 20 April 2009 from the Second Launch Pad at the Satish Dhawan Space Centre.[5]

RISAT-2

Names	Radar Imaging Satellite-2
Mission type	Radar imaging (Reconnaissance and disaster management)
Operator	Indian Air Force ISRO
COSPAR ID	2009-019A [1]
SATCAT no.	34807
Website	www.isro.gov.in/Spacecraft/risat-2
Mission duration	Planned: 5 years Final: 13 years (approx.)
Spacecraft properties
Spacecraft	RISAT-2
Bus	OptSat-2000
Manufacturer	ISRO (satellite) IAI (SAR radar)
Launch mass	300 kg (660 lb)
Power	750 watts
Start of mission
Launch date	20 April 2009, 01:15:00 UTC[2]
Rocket	PSLV-CA (PSLV-C12)
Launch site	Satish Dhawan, SLP
Contractor	Indian Space Research Organisation
End of mission
Decay date	30 October 2022, 00:06 UTC[3][4]
Orbital parameters
Reference system	Geocentric orbit[2]
Regime	Sun-synchronous orbit
Altitude	548 km (341 mi)
Inclination	41.0°
Period	90.0 minutes
RISAT programme RISAT-1 →

The principal sensor of RISAT-2 was an X-band synthetic-aperture radar (SAR) from Israel Aerospace Industries (IAI).[6] It is designed to monitor India's borders and as part of anti-infiltration and anti-terrorist operations.[7] The satellite has a mass of 300 kg (660 lb).

History

RISAT-2 was built at an accelerated pace following the 2008 Mumbai attacks, due to delay with the indigenously developed C-band for RISAT-1. It is India's first dedicated reconnaissance satellite.[8]

The X-band SAR used by RISAT-2 was obtained from Israel in return for launch services for the Israeli TecSAR-1 satellite. The SAR sensor enables RISAT-2 to return images at any time of day and in all weather conditions.

Technical capabilities

RISAT-2 was India's first satellite with a synthetic-aperture radar (SAR). It possess day-night as well as all-weather monitoring capability. Potential applications include tracking hostile ships at sea that are deemed a military threat to India.[9]

Though ISRO sought to underplay the satellite's defence applications in its announcements, a substantial number of articles concerning RISAT-2 in the Indian media continue to refer to it as a "spy satellite".[10] This is also supported by the fact that its Israeli sensor is clearly pronounced a military grade sensor by its manufacturer Israel Aerospace Industries (IAI).^{[citation needed]}

Launch

ISRO scientists spent tense hours on 19 April 2009 prior to launch as one of the umbilical cords holding the PSLV-CA launch vehicle to the launch pad fell off, damaging nearly six connectors.[11]

ANUSAT satellite

The ANUSAT student microsatellite (40 kg) was launched aboard the same launch vehicle as a secondary payload.

Mission

RISAT-2 was used to search for and eventually locate wreckage of the helicopter crash that claimed the life of Y. S. Rajasekhara Reddy, chief minister of the state of Andhra Pradesh, as well as the lives of his fellow passengers, while traveling over dense jungles in southern India on 2 September 2009.[12] The satellite reentered over Sumatra on 30 October 2022 at 00:06 UTC[4][3] after providing payload data for 13 years.[13][14]

See also

• Indian military satellites
• List of Indian satellites
• Indo-Israeli relations

References

На других языках

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[de] RISAT-2

RISAT-2 (kurz für Radar Imaging Satellite 2) ist ein indischer Radaraufklärungssatellit im Rahmen des Indian-Remote-Sensing-Programms.[3]

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- [en] RISAT-2

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[ru] RISAT-2

RISAT-2 (от англ. Radar Imaging Satellite-2) — индийский спутник дистанционного зондирования Земли, предназначен для радиолокационной разведки. Спутник был запущен 20 апреля 2009 из Космического центра имени Сатиша Дхавана с помощью ракеты-носителя PSLV-CA. Попутно с ним был также запущен образовательный спутник ANUSAT.

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