RENISH THOMAS (GPM) Global-Precipitation- Mapper EECS 823-FALL 2016 PROJECT RENISH THOMAS (GPM) Global-Precipitation- Mapper

PROJECT - outline Mission overview GPM core GMI-(GPM Microwave Imager) DPR-(Dual Frequency Precipitation RADAR) Data Products References

Mission overview GPM is a system of satellites designed to map the Precipitation of the Earth , i.e Rain, Snow. The participating countries are USA, France, India, EU etc. Possible future contributions by Russian and Chinese Micro- Wave radiometers. The GPM Constellation which are placed in orbits of different altitudes and coordinates , maps the whole Earth in a time span of about 3 hours.

Mission DESCRIPTION GPM Constellation .

GPM Core GPM CORE is a joint program by NASA (National Aerospace and Space Administration) and JAXA ( Japanese Aerospace and Exploration Agency).

Gpm core instruments RADIOMETER (GMI) : Gpm Microwave Imager: This is the primary instrument onboard, which is a 13 channel radiometer scanner, built by Ball Aerospace and Technology Corporation . RADAR (DPR) : Dual Frequency Precipitation RADAR: This is the Dual frequency precipitation mapping RADAR working in the Ka and Ku bands, built by JAXA.

GPM CORE SATELLITE

GMI-(GPM MICROWAVE IMAGER) BASIC SYSTEM PARAMETERS PARAMETER NAME VALUE Altitude 407 KM Orbital inclination 65 Deg Spin rate 32 RPM Scan time 1.875 sec Swath width 885 Km View sector 140 degrees Earth Samples 202-----pixels Integration time 3.6 msec Dish size 1.22 meters

GMI mapping the atmospheric layers

GMI mapping the atmospheric layers

GMI SCANNING SCANNING PARAMETERS Scanning mode : Conical Scanning sector: 140 degrees Satellite nadir angle: 48.5 degrees Earth Incidence angle: 52.8 degrees Ground track speed: 7.2 km/s

GMI CALIBRATION

GMI CALIBRATION HOT CALIBRATION LOAD COLD SKY REFLECTOR MATERIAL: ECCOSORB EMMISIVITY NEARLY 1

DPR-(DUAL FREQUENCY PRECIPITATION RADAR) PARAMETER NAME KU-RADAR KA-RADAR Frequency 13.6 GHz 35.5 GHz Swath width 245 KM 120 KM Range resolution 250 meters Spatial resolution 5 km Beam-width 0.71 Degrees Transmitters 128 solid state Tx power peak 1013 W 146 W PRF 4.1 to 4.4 Khz Pulse width  1.667 u-sec BASIC SYSTEM PARAMETERS

GMI –DPR BEAMSTEERING RADAR- BEAM STEERED USING 128 ELEMENT ACTIVE PHASED ARRAY- ELECTRICAL GMI- BEAM STEERED USING CONICAL SCANNER-MECHANICAL

WHY GMI AND DPR ? GMI PROVIDES THE BRIGHTNESS TEMPERATURES , BUT NO RANGING INFO DPR PROVIDES THE RANGING AND PARTICLE SIZE ESTIMATE THIS IS WHAT GIVES YOU THE BIG BUCKS $$$$ 3D MODEL OF PRECIPITATION

GMI AND DPR COMBINED DATA PRODUCTS GMI +GPM COMPINED DATA PRODUCT GMI DATA ONLY

Analysis to do Calibration Mechanisms. How are the data products made. Analysis of How the GPM core coordinates its data to create a final product. Pro’s and Con’s of the mission. Further improvements.

References http://www.remss.com/missions/gmi https://pmm.nasa.gov/gpm/flight-project/dpr https://www.nasa.gov/mission_pages/GPM/main/index.html http://global.jaxa.jp/projects/sat/gpm/ http://www.eorc.jaxa.jp/GPM/index_e.htm https://en.wikipedia.org/wiki/Global_Precipitation_Measurement http://www.ball.com/aerospace/programs/gmi