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

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

3. 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.

4. Mission DESCRIPTION GPM Constellation.

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

6. 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.

7. GPM CORE SATELLITE

8. 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
pixels
Integration time
3.6 msec
Dish size
1.22 meters

9. GMI mapping the atmospheric layers

10. GMI mapping the atmospheric layers

11. 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

12. GMI CALIBRATION

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

14. 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

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

16. 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

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

18. 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.

19. References http://www.remss.com/missions/gmi