Presentation on theme: "Current Status of INSAT Meteorological Satellites"— Presentation transcript:
1Current Status of INSAT Meteorological Satellites Dr.V.Rajeswara RaoScientist-E (Operations)Satellite Meteorology DivisionIndia Meteorological DepartmentNew Delhi, INDIA
2Introduction in late seventies to provide services to Meteorology, INSAT (Indian National Satellite) Program was startedin late seventies to provide services to Meteorology,Telecommunication & Television BroadcastAll INSAT Satellites are geostationary, multi-purpose (exceptKALPANA-1)and 3-axis stabilized systems.All these satellite are controlled and monitored by MasterControl Facility (MCF), ISRO situated at Hassan, nearBangalore, India.
3The first satellite INSAT-1A was launched on 10th April, 1982. The India Meteorological Department processed the firstearth image transmitted by INSAT-1A successfully with the ground reception system installed at IMD Head Quarter, New Delhi.Since then India Meteorological Department is involvedin receiving and processing data from INSAT-1, INSAT-2 and INSAT-3 series of satellites and different products generated and used for forecasting purposes.
4Current Status of INSAT Meteorological Satellites Currently there are two INSAT satellites in operationKALPANA-1INSAT-3AKALPANA-1 is an exclusive meteorological satellite launched in September, 2002 and positioned at 74ºE byPSLV-C4 from India.
5Originally named METSAT-1 Originally named METSAT-1. Renamed as KALPANA-1 after Kalpana Chawla who perished in the space shuttle Columbia.KALPANA-1 is currently working in inclined orbit with an inclination of 1.5 degINSAT-3A is a multi purpose satellite launched in April 2003 and positioned at 93.5ºE by European Ariane.Both the satellite will transmit the VHRR data at the rate 526kbps
6KALPANA-1 Payloads It has two payloads for Meteorological Purposes Very High Resolution Radiometer (VHRR)Data Relay Transponder (DRT).
7Characteristics of VHRR S.No Payload Channel Spectral Bandwidth Resolution1.VHRRVisibleµm2 Km. x 2 Km.Infraredµm8 Km. x 8 Km.WaterVapourµmDRT is used to transmit and receive data from AutomaticWeather Stations (AWS)
8Modes of OperationsThere are three Modes of Operation for VHRR payload.Full Frame ModeNormal Frame ModeSector Scan ModeThe scan coverage in East-West is 20deg in all modeswhere as North-South coverage will vary depending uponthe mode..
9The full frame mode is 20deg in both N-S and E-W direction and takes 33 minutes and number of lines will be 1560.The normal mode covers a range of 14deg in N-S direction and 20deg in E-W direction and takes 23 minutes and number of lines will be 1092.The sector scan mode which is useful for tracking the synoptic systems like thunderstorms etc. covers a range of 4.5 deg in N-S direction ( selectable) and 20deg in E-W direction takes 7minutes ( 3 scans in 23 minutes) and number of lines will be 351.Presently this satellite is providing half hourly normal scans round the clock.
11INSAT-3A Payloads It has three payloads for Meteorological Purposes Very High Resolution Radiometer (VHRR)Charged Coupled Device (CCD)Data Relay Transponder (DRT).
12The characteristics & modes of Operations of INSAT-3A VHRR Payload are exactly similar to KALPANA-1S.NoPayloadChannelSpectral BandwidthResolution1.VHRRVisibleµm2 Km. x 2 Km.Infraredµm8 Km. x 8 Km.WaterVapourµmINSAT-3A DRT is currently in use to transmit and receive datafrom Automatic Weather Stations (AWS)
15Modes of Operation for CCD payload There are two Modes of Operation for CCD payload.1. Normal Mode2. Program modeThe coverage in the normal mode will be 10 deg. Bothin East-West and North-South directionswhere as in the Program mode 1 to 25 lines, each covering deg. In the North-South direction and 10deg. InEast-West direction.Currently IMD is processing hourly images during day time only.
19Derivation of Geo Physical Parameters Using the imagery data of these two satellites, IMD is also deriving the following geo physical parameters routinely.Atmospheric Motion Vectors (AMV)Outgoing Longwave Radiation (OLR)Quantitative Precipitation Estimate (QPE)Sea Surface Temperature (SST)Upper Tropospheric Humidity (UTH)Normalised Difference Vegetation Index (NDVI)Aerosol Optical Depth (AOD)