{"id":4199,"date":"2024-03-19T12:45:41","date_gmt":"2024-03-19T12:45:41","guid":{"rendered":"https:\/\/news.talkwithrattan.com\/index.php\/2024\/03\/19\/nisar-only-in-2nd-half-of-2024-trishna-gets-nod-india-news-times-of-india\/"},"modified":"2024-03-19T12:45:41","modified_gmt":"2024-03-19T12:45:41","slug":"nisar-only-in-2nd-half-of-2024-trishna-gets-nod-india-news-times-of-india","status":"publish","type":"post","link":"https:\/\/news.talkwithrattan.com\/index.php\/2024\/03\/19\/nisar-only-in-2nd-half-of-2024-trishna-gets-nod-india-news-times-of-india\/","title":{"rendered":"Nisar only in 2nd half of 2024; Trishna gets nod | India News – Times of India"},"content":{"rendered":"
\"Nisar<\/div>\n
BENGALURU: The $1.5 billion Nasa-Isro Synthetic Aperture Radar (Nisar) satellite launch, which was expected to happen in March is unlikely before the end of May.
\u201cGSLV for Nisar will be built by March-April but the satellite is still undergoing tests and we are looking at some delay. It (launch) could happen in the second half of this year,\u201d Somanath told TOI in an exclusive interview.
Nisar, a dual radar satellite, with both Isro and Nasa building one radar each, is to launch on India’s GSLV. According to Nasa\u2019s Jet Propulsion Lab (JPL), the lead agency from the US, \u201cNisar is the first satellite mission to collect radar data in two microwave bandwidth regions, called the L-band and the S-band, to measure changes of our planet\u2019s surface, including movements as small as centimetre.
The satellite, after initial integration in the US, has been at the UR Rao Satellite Centre (URSC) in Bengaluru. Once launched Nisaar will measure Earth\u2019s changing ecosystems, dynamic surfaces, and ice masses providing information about biomass, natural hazards, sea level rise, and groundwater, and will support a host of other applications.
It will observe Earth\u2019s land and ice-covered surfaces globally with 12-day regularity on ascending and descending passes, sampling Earth on average every six days for a baseline 3-year mission.
Meanwhile, another joint mission Isro is taking up \u2014 with the French space<\/a> agency \u2014 has got the space commission\u2019s nod. The project is called Trishna \u2014 Thermal infraRed Imaging Satellite for High-resolution Natural resource Assessment.
\u201cTrishna has been on cards for a long time but it wasn\u2019t approved by the government. We\u2019ve now got the approval, the last space commission cleared it. The project teams have been formed. The French side\u2019s approach is to build the payload through another agency, work on that is progressing, and so is work on our side,\u201d Somanath said.
According to French space agency CNES (National Centre for Space Studies), Trishna will acquire imagery of Earth\u2019s surface in the thermal infrared with a resolution and revisit frequency never seen before.
\u201cTrishna is designed to observe Earth\u2019s surface in the thermal infrared domain. Temperature is an indicator of the energy budget of land surfaces \u2014 croplands, pastures, forests, urban areas, snow and ice \u2014 and yields a wealth of information such as plant water stress and evapotranspiration,\u201d CNES\u2019 description of Trishna, reads.
Today, temperature measurements from space can only be obtained monthly at a resolution of about 100 metres, and daily global measurements are only available at a resolution of one kilometre, CNES says, adding that Trishna\u2019s aims to reach a resolution of 57 metres with a revisit interval of three days.
\u201cThis will enable scientists to understand local evolution of biological (water stress, transpiration), physical (evaporation, sublimation, plumes) and climatic (global observation over time) phenomena in relation to water cycle. Trishna will be a precious aid to inform policy decisions for farming, water resource management and land planning,\u201d it added.
Trishna\u2019s thermal infrared instrument, developed by CNES, will be supplemented by an optical sensor supplied by Isro.<\/div>\n