Mr. Mantravadi Venkata Rao Profile

Mantravadi Venkata Rao

at Indian Space Research Organisation

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Proceedings Article | 8 December 2006 Paper

ROSA on Oceansat-2

Vittorio de Cosmo, Valeria Catalano, Luciano Garramone, Rosa Loizzo, Mino Marzo, K. Thyagarajan, M. Venkatarao, Francesco Vespe

Proceedings Volume 6408, 640802 (2006) https://doi.org/10.1117/12.693859

KEYWORDS: Global Positioning System, Antennas, Satellites, Receivers, Aerospace engineering, Temperature metrology, Humidity, Earth's atmosphere, Refractive index, Data modeling

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ROSA (Radio Occultation Sounder of Atmosphere) is a space instrument which uses the Radio Occultation Technique to provide highly accurate measurements of the atmospheric refractive indexes from which it is possible to derive, atmospheric vertical profiles of temperature, pressure and humidity, as well as profiles of electron content in the ionosphere. The measurements, generally, are made by using meteorological balloons, able to give a very detailed atmospheric profiles but only on a local scale. From the space, ROSA, flying on a LEO orbit, is able to perform more than 500 atmospheric profiles per day on a global scale, The ROSA instrument is the core of a scientific program, of the same name, promoted by the Italian Space Agency (ASI) to contribute to a better understanding of Climate Change. This program foresees the installation of the ROSA instruments on several space missions and the developments of an ad hoc Ground Segment for the acquisition and processing of the data. The ISRO (Indian Space Research Organization) mission OCEANSAT-2 will be the first mission that will embark ROSA. OCEANSAT-2 is an operative mission for the study of the Ocean that will be launched next July 2007.

Proceedings Article | 30 November 2006 Paper

RESOURCESAT-2: a mission for Earth resources management

M. Venkata Rao, J. P. Gupta, Ram Rattan, K. Thyagarajan

Proceedings Volume 6407, 64070L (2006) https://doi.org/10.1117/12.697973

KEYWORDS: Satellites, Cameras, Sensors, Charge-coupled devices, Space operations, Electronics, Stars, Remote sensing, Imaging systems, Magnetic sensors

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The Indian Space Research Organisation (ISRO) has established an operational Remote sensing satellite system by launching its first satellite, IRS-1A in 1988, followed by a series of IRS spacecraft. The IRS-1C/1D satellites with their unique combination of Payloads have taken a lead position in the Global remote sensing scenario. Realising the growing User demands for the "Multi" level approach in terms of Spatial, Spectral, Temporal and Radiometric resolutions, ISRO identified the Resourcesat as a continuity as well as improved RS Satellite. The Resourcesat-1 (IRS-P6) was launched in October 2003 using PSLV launch vehicle and it is in operational service. Resourcesat-2 is its follow-on Mission scheduled for launch in 2008. Each Resourcesat satellite carries three Electro-optical cameras as its payload - LISS-3, LISS-4 and AWIFS. All the three are multi-spectral push-broom scanners with linear array CCDs as Detectors. LISS-3 and AWIFS operate in four identical spectral bands in the VIS-NIR-SWIR range while LISS-4 is a high resolution camera with three spectral bands in VIS-NIR range. In order to meet the stringent requirements of band-to-band registration and platform stability, several improvements have been incorporated in the mainframe Bus configuration like wide field Star trackers, precision Gyroscopes, on-board GPS receiver etc,. The Resourcesat data finds its application in several areas like agricultural crop discrimination and monitoring, crop acreage/yield estimation, precision farming, water resources, forest mapping, Rural infrastructure development, disaster management etc,. to name a few. A brief description of the Payload cameras, spacecraft bus elements and operational modes and few applications are presented.

Proceedings Article | 30 November 2006 Paper

OCEANSAT 2: mission and its applications

R. Parmar, R. Arora, M. Venkata Rao, K. Thyagarajan

Proceedings Volume 6407, 64070C (2006) https://doi.org/10.1117/12.697883

KEYWORDS: Satellites, Sensors, Antennas, Electronics, Modulation, Receivers, Ku band, Sun, Wind measurement, Space operations

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Monitoring of the Geo-physical and Bio-geo-physical parameters of the global oceans at meso-scales is an important aspect of the Space borne Earth Remote sensing for weather forecasting and climatic studies. ISRO has initiated action in this direction by launching the IRS-P4 satellite in May 1999 which carried two instruments, an Ocean Colour Monitor (OCM) and a Multi-frequency Scanning Microwave Radiometer (MSMR). These payloads provided valuable data over Indian ocean with limited global coverage for many applications like PFZ, SST, water vapour content, monsoon forecasting etc,. The Oceansat-2 Mission will provide continuity of services of IRS-P4 with enhanced application potential. It will carry a Ku-Band pencil beam Scatterometer for global wind vector measurements and OCM with optimized spectral characteristics. The Satellite is configured to support these Payloads operation covering the global oceans with a two-day repetevity. While meeting the continued demand of its present data users, the OCM will have several enhanced applications in the areas of Chlorophyll concentration and primary productivity, suspended sedimentation dynamics, Carbon cycle monitoring, marine pollutants/oil slicks etc,. The Ku-band Scatterometer will cover ~ 97% of the global oceans daily and will provide measurements of surface wind vectors. This data will be a major input for the local weather forecasting and NWP models. The Scatterometer data is also used for sea state forecasting and ocean dynamics, monitoring of extreme events like cyclones/hurricanes, Polar Ice studies etc,. In this paper, a brief description of the Payload Instruments, Satellite Mainframe elements, Mission operations plan and typical applications are covered.

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