Global Precipitation Measurement GPM

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Global Precipitation Measurement (GPM)

• NASA GPM Development Status
• 4th GPM Workshop
• Washington, D.C.
• June 15, 2004

John Durning GPM Project Formulation
Manager John.F.Durning_at_nasa.gov Goddard Space
Flight Center
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Overview

• Mission Overview
• Core Instruments
• Core Spacecraft Status
• Spacecraft Overview
• Core Spacecraft Video

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Mission Overview

• The GPM Mission consists of multiple
  international partner satellites working in
  concert to cover the globe with precipitation
  measurements (primarily through microwave
  radiometer measurements).

• Core Satellite
• TRMM-Like S/C, NASA
• H2-A Launch, JAXA
• Non-Sun Synchronous Orbit
• 65 Inclination
• 400 km Altitude
• Dual Frequency Radar, JAXA
• Ku Ka Bands
• 5 km Horizontal Resolution
• 250 m Vertical Resolution
• Multifrequency Radiometer, NASA
• 10.65, 18.7, 23.8, 36.5, 89 GHz VH

• Constellation Satellites
• Dedicated Small or Pre-existing Experimental
  Operational Satellites with PMW Radiometers
• Revisit Time
• 3-Hour goal
• Sun- Non-Sun- Synch Polar Orbits
• 600 km Altitude

• Global Precipitation Processing Center
• Produces Global Precipitation Data Product
  Streams Defined by GPM Partners

• Ground Validation Sites
• Selected Globally Distributed Ground- Based
  Supersites (Multiparameter radar, up looking
  radiometer/radar/profiler, raingages,
  disdrometers)
• Dense Regional Raingage Networks

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Mission Overview (continued)
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Mission Overview (continued)

• NASA is directly responsible for contributing
• key elements of the Core spacecraft (spacecraft
  development, ground system, and the GMI
  instrument) and
• One constellation spacecraft and its ground
  system
• Precipitation Processing System development
• Two Ground Validation Supersites
• JAXA is directly responsible for contributing
• The Ka-band Precipitation Radar (to fly on the
  Core spacecraft)
• The Ku-band Precipitation Radar (to fly on the
  Core spacecraft)
• The launch vehicle for the Core spacecraft
• Other US agencies such as DOD NOAA provide
  radiometer data streams from existing space asset
  to PPS for integration into the precipitation
  data product

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Core Spacecraft Data Flow Overview
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GPM Microwave Imager
GPM Core Spacecraft Instruments

• The GPM Core Spacecraft payload consists of
• Precipitation radars Ku Ka bands to be
  provided by JAXA (details provided in separate
  JAXA presentation)
• Microwave Radiometer (GMI) to be provided by
  NASA
• GMI Goals
• Performance Equivalent to TMI as a minimum
• GMI Schedule
• RFP is ready for release
• Award Contract later this year
• Delivery late 2008

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Instrument Accommodations

• Dual- (Ka Ku) Precipitation Radar (DPR)
• Nadir Viewing
• View to cold space
• Electronic cross track scan
• GPM Microwave Imager (GMI)
• Off-nadir viewing (53º)
• 1.2 m aperature
• Cold calibration view
• Conically scanning

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Core Spacecraft Status

• In the midst of preliminary design phase
  targeting a PDR of the spacecraft later this year
• In the midst of evaluating alternative
  development approaches commercial buys to try
  to minimize launch delays
• Working with NASA HQ on schedule hope to target
  Mission PDR mid-next year
• Spacecraft design-for-demise approach continues
  to be pursued would avoid the need for
  controlled reentry and its cost debate

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Core Spacecraft On Orbit View
GMI
KaPR
KuPR
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Core Spacecraft Resources
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Launch Vehicle Configuration

• The GPM Core Spacecraft will be launched on board
  the H-IIA launch vehicle

GMI
PR-U
PR-A
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GPM Top Level Schedule
UNDER REVIEW
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Video

• Run core spacecraft video!