Geo Imaging Satellite or GISAT is an Indian imaging satellite class for geostationary orbit with a high temporal resolution, meant for providing near real time imaging with fast revisit capability and real time monitoring.https://www.isro.gov.in/sites/default/files/flipping_book/annual_report_2019-20_english/files/assets/common/downloads/Annual%20Report%202019-20%20 Two satellites will provide resolution in the range of 42 to 318 m. It will carry multi-spectral (Visible and Near-InfraRed, and Short Wave-InfraRed), multi-resolution (42 to 318 m) imaging instruments.
The first satellite; EOS-03 (aka GISAT-1) was launched on 12 August 2021 but failed to reach orbit as cryogenic upper stage of GSLV could not ignite. EOS-3 was supposed to fulfil civilian applications. The second satellite, EOS-05 (aka GISAT-2) will be acquired by Indian Navy and will differ slightly in capabilities compared to EOS-03 (aka GISAT-1).
Payload
GISATs will image in multi-spectral and hyper-spectral bands to provide near real-time pictures of large areas of the country, under cloud-free conditions, at frequent intervals which is, selected field image in every 5 minutes and entire Indian landmass image every 30 minutes at 42 m spatial resolution.
Features of GISAT-1 are: 700 mm Ritchey–Chrétien telescope based on the design of Cartosat-2A Array detectors in Visible and Near-InfraRed (VNIR), and Short Wave-InfraRed (SWIR) bands Electronically steerable, phased array antenna High agility, jitter-free platform
+Imaging capabilities of GISAT-1 BandChannelsGround Resolution(m)Range(μm)Multispectral (VNIR)6420.45 – 0.875Hyperspectral (VNIR)1583180.375 – 1.0Hyperspectral (SWIR)2561910.9 – 2.5
Launch schedule Designation COSPAR ID NORAD ID Power Launch Orbital parameters Remarks Launch date, Time (UTC) Launch mass Launch vehicle Launch site Orbit Longitude EOS-03(GISAT-1) Failed to orbit 2280 watts 12 August 2021,00:13 UTC 2268 kg GSLV-F10 SDSC GTO 85.5° East (planned) EOS-05(GISAT-1A) 2026-202A 100607 2280 watts 3 September 2026, 21:25 UTC 2367 kg GSLV-F17 SDSC GTO GISAT-2 TBD TBD 2280 watts 2027 (planned) 2268 kg SDSC GTO
See also
NAVIC INSAT GSAT Cartosat RISAT EOS-01 EOS-04
References