OceanSat-2
OceanSat -2 is a Indian ocean research satellite from the Indian Remote Sensing series.
Details
The satellite was on 23 September 2009 with a PSLV -C14 rocket from the Satish Dhawan Space Centre ( SDSC ) in Sriharikota on India's southern coast, along with four other satellites, UWE -2, University of Würzburg, SwissCube 1 of the Swiss Federal Polytechnic School of Lausanne ( EPFL, Ecole Polytechnique Fédéral de Lausanne ), BeeSat of the Technical University of Berlin and ITU- PSAT from Istanbul Technical University (ITU, Istanbul Technical University), started. After 1081 seconds was OceanSat -2 exposed at an altitude of 728 kilometers above the earth's surface in a sun-synchronous orbit with an inclination of 98.28 degrees.
The main objectives of the mission are the study of wind and water flow at the sea surface, the observation of chlorophyll concentrations, monitoring of phytoplankton bloom and the study of atmospheric aerosols and suspended matter in the water.
Oceansat -2 is the second ISRO satellite in the series of IRS satellites and maritime research to the tasks of OceanSat -1 (1999 started) to continue. OceanSat -2 carries three instruments, including an Ocean Colour Monitor ( OCM), which closely resembles that of OceanSat -1 carried 6-band spectrometer. Data from all instruments should be made after a six- month trial period available to researchers worldwide.
Construction
The payload consists of two Indian and one Italian instruments.
- Ocean Colour monitor ( OCM) - OCM is an 8- band multi-spectral camera operating in the visible and near infrared range. The camera offers a resolution of 360x235 meters and a swath width of 1420 km, where it can be tilted up to 20 ° off the flight direction. The corresponding sensors consist of eight transverse to the direction of flight line sensors, each with 6000 pixels and a Spektralbandpass before.
- Ku-band scatterometer ( SCAT ) - SCAT is in the gigahertz range ( 13.515 GHz) radar working with two beams. These keys with a rotating 20.5 revolutions per minute and meter at 46 ° deviant from the vertical surface below the antenna of the satellite, and determines the wind velocity 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 built by the Italian Space Agency ASI GPS receiver with two antennas, which should be used for studies of the atmosphere. For this purpose, the refraction of radio signals from GPS satellites in Earth's atmosphere is used when these disappear on its trajectory behind the Earth in order to obtain the vertical profiles of temperature and humidity. The vertical resolution amounts to between 0.3 and 3 miles and less than 1 ° Kelvin and 10% humidity.
The 960 kg heavy and built from aluminum alloys satellite will deliver together of 15,12 -square-foot solar panels 1360 watts and provides two 24 Ah nickel - cadmium batteries with energy. The supply voltage of the two bus systems is 28 and 42 volts. For stabilization are ground and digital sun sensors, three-axis magnetometer and gyroscopes used to the torque Reaction Wheels, Magnetic Torque Coils and a hydrazine thruster for attitude and orbit control use.
The data transmission to Earth takes place at X-band with 42.4515 Mbps in QPSK modulation, where the data is buffered in a 64 Gbit solid-state hard drive. The control and telemetry signals are transmitted GHz range of 4 to 16 Kbps 2.