RISAT-2, or Radar Imaging Satellite-2 was an Indian

radar imaging Imaging radar is an application of radar which is used to create two-dimensional images, typically of landscapes. Imaging radar provides its light to illuminate an area on the ground and take a picture at radio wavelengths. It uses an antenna and ...

reconnaissance satellite A reconnaissance satellite or intelligence satellite (commonly, although unofficially, referred to as a spy satellite) is an Earth observation satellite or communications satellite deployed for military or intelligence applications. The ...

that was part of India's

RISAT RISAT (Radar Imaging Satellite) is a series of Indian radar imaging reconnaissance satellites built by ISRO. They provide all-weather surveillance using synthetic aperture radars (SAR). The ''RISAT'' series are the first all-weather Earth obs ...

programme. It was built by

Indian Space Research Organisation The Indian Space Research Organisation (ISRO; ) is the national space agency of India, headquartered in Bengaluru. It operates under the Department of Space (DOS) which is directly overseen by the Prime Minister of India, while the Chairman ...

(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 Satish Dhawan Space Centre - SDSC (formerly Sriharikota Range - SHAR) is a rocket launch centre (spaceport) operated by Indian Space Research Organisation (ISRO). It is located in Sriharikota, Tirupati district of Andhra Pradesh. Sriharikota R ...

. The principal sensor of RISAT-2 was an

X-band The X band is the designation for a band of frequencies in the microwave radio region of the electromagnetic spectrum. In some cases, such as in communication engineering, the frequency range of the X band is rather indefinitely set at approxim ...

synthetic-aperture radar (SAR) from

Israel Aerospace Industries Israel Aerospace Industries (Hebrew: התעשייה האווירית לישראל ''ha-ta'asiya ha-avirit le-yisra'el'') or IAI (תע"א) is Israel's major aerospace and aviation manufacturer, producing aerial and astronautic systems for both mi ...

(IAI). It is designed to monitor India's

border Borders are usually defined as geographical boundaries, imposed either by features such as oceans and terrain, or by political entities such as governments, sovereign states, federated states, and other subnational entities. Political borders c ...

s and as part of anti-infiltration and anti-terrorist operations. The satellite has a mass of .

History

RISAT-2 was built at an accelerated pace following the

2008 Mumbai attacks The 2008 Mumbai attacks (also referred to as 26/11, pronounced "twenty six eleven") were a series of Terrorism, terrorist attacks that took place in November 2008, when 10 members of Lashkar-e-Taiba, an Islamist terrorist organisation from P ...

, due to delay with the indigenously developed C-band for

RISAT-1 Radar Imaging Satellite 1 or RISAT-1, was an Indian remote sensing satellite built by the Indian Space Research Organisation and operated by National Technical Research Organisation . The second RISAT satellite to be launched, it used a C-b ...

. It is India's first dedicated reconnaissance satellite. The X-band SAR used by RISAT-2 was obtained from

Israel Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...

in return for launch services for the Israeli

TecSAR-1 TecSAR-1, also known as TechSAR, Polaris and Ofeq-8, is an Israeli reconnaissance satellite, equipped with a synthetic-aperture radar (SAR) developed by Elta Systems. It was successfully launched at 03:45 UTC on 21 January 2008, by PSLV C- ...

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. 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". This is also supported by the fact that its Israeli sensor is clearly pronounced a military grade sensor by its manufacturer

(IAI).

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.

ANUSAT satellite

The ANUSAT student

microsatellite A microsatellite is a tract of repetitive DNA in which certain DNA motifs (ranging in length from one to six or more base pairs) are repeated, typically 5–50 times. Microsatellites occur at thousands of locations within an organism's genome. ...

(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 A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes ...

that claimed the life of

Y. S. Rajasekhara Reddy Yeduguri Sandinti Rajasekhara Reddy (8 July 1949 – 2 September 2009), popularly known as YSR, was the 14th chief minister of the Indian state of Andhra Pradesh, serving from 2004 to 2009. Reddy was elected to the 9th, 10th, 11th, and 12t ...

, chief minister of the

state of Andhra Pradesh Andhra Pradesh (, abbr. AP) is a state in the south-eastern coastal region of India. It is the seventh-largest state by area covering an area of and tenth-most populous state with 49,386,799 inhabitants. It is bordered by Telangana to the ...

, as well as the lives of his fellow passengers, while traveling over dense jungles in southern India on 2 September 2009. The satellite reentered over Sumatra on 30 October 2022 at 00:06 UTC after providing payload data for 13 years.

References