GEO Imaging Satellite
Indian earth observation satellite
From Wikipedia, the free encyclopedia
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.[9] Two satellites will provide resolution in the range of 42 to 318 m.[1][10] It will carry multi-spectral (Visible and Near-InfraRed, and Short Wave-InfraRed), multi-resolution (42 to 318 m) imaging instruments.[11]
GISAT-1 spacecraft in the cleanroom before encapsulation. | |
| Manufacturer | |
|---|---|
| Country of origin | India |
| Operator | ISRO |
| Applications | Earth observation |
| Specifications | |
| Bus | I-2K [1] |
| Launch mass | 2268 kg [2][3] |
| Power | 2280 watts[1] |
| Equipment | Ritchey-Chrétien telescope[4] Multispectral array detectors Steerable antenna |
| Regime | Geostationary orbit |
| Design life | 7 years (planned) |
| Production | |
| Status | Planned |
| Launched | 1 |
| Operational | 0 |
| Failed | 1 |
| Lost | 0 |
| Maiden launch | 12 August 2021, 00:13 UTC[5][6][7][8] |
The first satellite; EOS-3 (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.[12]
The second satellite, EOS-5 (aka GISAT-2) will be acquired by Indian Navy and will differ slightly in capabilities compared to EOS-03 (aka GISAT-1).[13][12][14]
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.[1]
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
| Band | Channels | Ground Resolution(m) | Range(μm) |
|---|---|---|---|
| Multispectral (VNIR) | 6 | 42 | 0.45 – 0.875 |
| Hyperspectral (VNIR) | 158 | 318 | 0.375 – 1.0 |
| Hyperspectral (SWIR) | 256 | 191 | 0.9 – 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[15] | 2280 watts | 12 August 2021, 00:13 UTC |
2268 kg | GSLV-F10 | SDSC | GTO | 85.5° East (planned) | [16][17][18][19][20][21][3][22][23][8] | |
| EOS-05 (GISAT-1A) |
TBD | TBD | 2280 watts | Q1 2026 (planned) | 2268 kg | GSLV-F18 | SDSC | GTO | [24][25][23][26] | |
| GISAT-2 | TBD | TBD | 2280 watts | 2027 (planned) | 2268 kg | SDSC | GTO | [27][28][23][29] | ||
