IRS-1A is the first remote sensing satellite launched by the Indian Space Research Organization (ISRO) in 1988 with a Vostok-2M launch vehicle from the Baikonur Cosmodrome . It was a partially operational, partially experimental mission launched with the aim of gaining experience in India in the field of satellite imagery [2] .
| IRS-1A | |
|---|---|
| Indian Remoste Sensing Satellite 1A ( Hindi : आई.आर.एस.-1ए) | |
| Customer |  NNRMS |
| Manufacturer | ISRO |
| Operator | ISRO |
| Type of satellite | Earth Remote Sensing |
| Launch pad |  Baikonur |
| Launch vehicle | Vostok-2M |
| Launch | March 17, 1988 06.43 UTC |
| Flight duration | 8 years |
| Descent from orbit | July 1996 |
| NSSDC ID | 1988-021A |
| SCN | 18960 |
| Specifications | |
| Platform | I-1K (INSAT-1000)) |
| Weight | 975 kg |
| Dimensions | 1.56x1.66x1.10 m |
| Power | 600 watts |
| Orientation | Triaxial |
| Elements of the orbit | |
| Orbit type | sun-synchronous orbit |
| Eccentricity | 0,00371 |
| Mood | 99.010 ° |
| Circulation period | 102.70 min |
| Apocenter | 917 km |
| Pericenter | 863 km |
| Orbit height | 904 km |
| Orbit Repeat | 22 days (307 turns) |
| Span | 148 km |
| Target equipment | |
| Scanning camera | IRS-1A / LISS (Linear Imaging Self-Scanned Sensors) |
| Transponders | S-band , X-band and VHF |
| Transmission speed | 5.2 Mbps [1] |
| Project site | |
Content
Purpose
Conducting research on the Earth and, in particular, the territory of India to obtain data used in agriculture , forestry , geology and hydrology . The satellite was positioned as experimental, but its performance was good, and its data was actively used for 8 years over the entire life of the satellite [3] .
History
The origin of the Indian satellite can be traced back to May 10, 1972, and when the agreement on cooperation between India and the USSR was signed. The first Indian satellite Ariabhata was launched on April 19, 1975 . Then, in 1979 and 1981, BHASKARA 1 and 2 were launched. The technologies and infrastructure obtained and developed in these missions were used to create the IRS-1A. In 1982, a national natural resource management system was created in India ( Eng. National Natural Resources Management System (NNRMS) ), which develops several tasks and research projects on the assessment and management of natural resources of the country. To solve specific tasks in May 1983, an order was received for the development of a remote sensing satellite in India. In 1988, a decision was made to start using the launch pad of Baikonur. The satellite was launched on March 17, 1988 . After the start, there were small problems with the orientation of the device, but the very next day the data began to come to Earth. In July 1996, the satellite completed work [4] .
Design
The device was designed on the basis of the universal platform I-1K . The mass of the satellite was 975 kg. The satellite had two solar panels , a three-axis stabilization system, and 16 shunting engines using hydrazine e as fuel [5] .
As the payload , two automatic scanning systems operating in the visible and infrared ranges were used: LISS-I and LISS-II (Linear Imaging Self-Scanned Sensors).
LISS-I had a resolution of 72.5 meters with a scan band of 148 km. LISS-II had two separate cameras, LISS-II A and LISS-II B, with a resolution of 36.25 m. Each and is installed on the spacecraft in such a way as to provide a total scan band of 146.98 km. The range of 0.45-0.52, 0.52-0.59, 0.62-0.68 and 0.77-0.86 micrometers [1] .
Notes
- ↑ 1 2 IRS - eoPortal Directory - Satellite Missions . directory.eoportal.org. Date of treatment September 4, 2019.
- ↑ NASA - NSSDCA - Spacecraft - Details . nssdc.gsfc.nasa.gov. Date of treatment September 4, 2019.
- ↑ The Saga of Indian Remote Sensing Satellite System - ISRO . www.isro.gov.in. Date of treatment September 4, 2019.
- ↑ (PDF) INDIAN REMOTE SENSING SATELLITE, IRS-1A: A FORERUNNER FOR OPERATIONAL ERA . ResearchGate. Date of treatment September 4, 2019.
- ↑ IRS-1A - ISRO . www.isro.gov.in. Date of treatment September 4, 2019.