Mr. Rameshchandra M. Parmar Profile

Rameshchandra M. Parmar

at Space Applications Ctr

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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.

Proceedings Article | 28 November 2006 Paper

Ocean color monitor sensor

Rameshchandra Parmar, Somya Sarkar, Chirag Dewan, Satyaharischandrarao Undurti, Himanshu Pandya, Hemal Bhagat, Manoj Detroja, Harish Seth

Proceedings Volume 6406, 64060D (2006) https://doi.org/10.1117/12.697953

KEYWORDS: Sensors, Signal to noise ratio, Electronics, Satellites, Modulation transfer functions, Calibration, Ocean optics, Data modeling, Remote sensing, Sensor performance

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Costal Zone Color Scanner (CZCS) was the first of its kind sensor flown in 1978 for ocean studies. It gave quantitative estimate of phytoplankton. After that, many missions were launched by various agencies like IRS-P3-MOS, Sea-WiFS, OCTS, MODIS, MERIS etc. The data from these sensors was utilized to study, develop retrieval algorithms, validate the models and define the new sensor parameters for better extraction and estimation of chlorophyll and other ocean biological and physical parameters on a routine basis. ISRO's Ocean Color Monitor (OCM-1) was launched in 1999 onboard Oceansat-1 (IRS-P4), polar orbiting satellite. This paper highlights some of the important features, specifications and performance of OCM sensor. It also briefly gives some of the enhancements planned for OCM-II. OCM provides multi-spectral imagery with narrow spectral width having large field of view of ±43° and ground resolution of 360m. The sensor is designed to cater to land and ocean applications globally and accordingly it has high radiometric sensitivity with large dynamic range. The radiometric performance is realized using low noise circuit designs and practices. The optics and detectors are mounted on a highly stable structure, which facilitates achieving band-to-band registration, minimizes veiling glare and temperature excursions and avoids sun glints. To provide continuity in services, OCM-II is being developed for Oceansat-II, slated launch second half of 2007. OCM is the only sensor which meets both ocean and land applications simultaneously.

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