OceanSat-2
| OceanSat-2 | |
|---|---|
| Type: | Research satellite |
| Country: |
 India
|
| Operator: | ISRO |
| COSPAR-ID : | 2009-051A |
| Mission dates | |
| Dimensions: | 960 kg |
| Begin: | September 23, 2009, 06:21 UTC |
| Starting place: | Satish Dhawan Space Center |
| Launcher: | PSLV C-14 |
| Status: | in operation |
| Orbit data | |
| Rotation time : | 99.3 min |
| Orbit inclination : | 98.3 ° |
| Apogee height : | 732 km |
| Perigee height : | 728 km |
OceanSat-2 is an Indian marine research satellite from the Indian Remote Sensing series.
Mission history
Oceansat-2 is the second ISRO satellite in the series of IRS marine research satellites and continues the tasks of OceanSat-1 (launched in 1999). OceanSat-2 carries three instruments including an Ocean Color Monitor (OCM) which is very similar to the 6-band spectrometer carried by OceanSat-1.
The main objectives of the mission are to study wind and water currents at the sea surface, observe chlorophyll concentrations, monitor the flowering of phytoplankton and study atmospheric aerosols and suspended matter in water.
The satellite was launched on September 23, 2009 with the PSLV rocket C14 from the Satish Dhawan Space Center (SDSC) in Sriharikota on India's south coast together with four other satellites, UWE-2 from the University of Würzburg, SwissCube 1 from the Swiss Federal Institute of Technology in Lausanne (EPFL , École polytechnique fédérale de Lausanne ), BeeSat from the Technical University of Berlin and ITU-pSat from the Technical University of Istanbul (ITU, Istanbul Technical University). After 1081 seconds, OceanSat-2 was deployed at an altitude of 728 kilometers above the earth's surface in a sun-synchronous orbit with an orbit inclination of 98.28 degrees. The three instruments worked without any problems. In late February 2014, a problem occurred in a traveling wave tube amplifier, causing the scatterometer to fail.
construction
The payload consists of two Indian and one Italian instruments.
- Ocean Color Monitor (OCM) - OCM is an 8-band multispectral camera that works in the visual and near infrared range . The camera offers a resolution of 360 × 235 meters and a swath width of 1420 km, whereby it can be swiveled up to 20 ° outside the direction of flight. The associated sensors consist of eight line sensors positioned across the direction of flight, each with 6000 pixels and a spectral bandpass in front of it.
- Ku-band scatterometer (SCAT) - SCAT is a two-beam radar operating in the gigahertz range (13.515 GHz) . These scan the surface of the earth beneath the satellite with a one meter antenna that rotates at 20.5 revolutions per minute and deviates by 46 ° from the vertical and determines the wind speeds in the range of 4 to 24 m / s. The scanned surface is 1400 or 1840 km and has a resolution of about 50 km.
- Radio Occultation Sounder for Atmosphere (ROSA) ROSA is a GPS receiver with two antennas built by the Italian space agency ASI , which is to be used for investigations of the atmosphere. For this purpose, the refraction of radio signals from GPS satellites in the earth's atmosphere when they disappear on their trajectory behind the earth is used to obtain the vertical profiles of temperature and humidity. The vertical resolution is between 0.3 and 3 km and less than 1 ° Kelvin or 10% humidity .
The satellite, which weighs 960 kg and is made of aluminum alloys , will deliver 1360 watts from a total of 15.12 square meters of solar panels and two 24 Ah nickel-cadmium batteries . The supply voltage of the two bus systems is 28 and 42 volts. For stabilization, earth and digital sun sensors , three-axis magnetometers and gyroscopes are used that use torque reaction wheels , magnetic torque coils and a hydrazine engine for position and orbit control.
The data transmission to earth takes place in the X-band at 42.4515 Mbps in QPSK modulation, with the data being temporarily stored in a 64 GBit solid-state hard drive . The control and telemetry signals are transmitted in the 2 GHz range with 4 to 16 Kbps.
Web links
- ISRO: Oceansat-2 (English; PDF; 3 MB)
- ISRO: Information on the launch of Oceansat-2
- eoPortal: OceanSat-2 (English)
Individual evidence
- ↑ a b Oceansat-2. In: eoPortal. ESA, accessed on August 13, 2013 .
- ↑ Oceansat 2. n2yo, August 12, 2013, accessed on August 13, 2013 (English).
- ↑ Thomas Weyrauch: PSLV-C14 brings five satellites into space. raumfahrer.net, September 23, 2009, accessed on August 13, 2013 .
- ↑ ISRO: Oceansat-2 payloads are providing good quality data. October 12, 2009, accessed September 26, 2016 .
- ^ Jet Propulsion Laboratory: Discontinuation of OSCAT Data Retrieval. April 10, 2014, archived from the original on September 27, 2016 ; accessed on September 26, 2016 (English).
- ↑ OceanSat-2 (IOCC) (PDF; 3.3 MB)
- ↑ Oceansat-2: Announcement of Opportunity (PDF; 0.3 MB)