JAXA GPMDPR program status

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JAXA GPM/DPR program status
Masahiro Kojima Japan Aerospace Exploration
Agency (JAXA) Office of Space
Applications GPM/DPR Project
Manager
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JAXAs GPM/DPR mission

• JAXAs GPM/DPR mission
• - Dual-frequency Precipitation Radar (DPR)
  development
• - Development of DPR and MWRs combined algorithms
  for improvement of precipitation retrieval
  accuracy from MWR
• - Scientific research and demonstration of
  operational applications such as numerical
  weather forecast and disaster prevention program
  (Processing DRP product, DPRMWRs product and
  distribution)
• GPM/DPR mission concept Produce highly accurate
  and frequent precipitation data for operational
  and scientific data use.
• DPR is the key instrument in GPM mission. (DPR
  information will improve MWRs rain retrieval
  accuracy. )

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Objectives of DPR

• Three-Dimensional observation of precipitation
• Observation of light rainfall and snowfall,
  taking advantage of high sensitivity of KaPR
• Derivation of DSD (Drop Size Distribution)
  parameter using differential attenuation method
• Improvement of MWRs precipitation estimation
  accuracy using the precipitation parameters (DSD,
  melting level, rain type, storm height, etc.)
  derived by DPR

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Concept of precipitation measurement by the GPM
core satellite
Objectives of DPR 1) Accurate and sensitive
precip. measurement 2) Improvement of
precipitation retrieval accuracy from MWRs
Dual-frequency precipitation radar (DPR) consists
of Ku-band (14GHz) radar KuPR and Ka-band
(35GHz) radar KaPR
Flight direction
GMI
DPR
Range resolution 250m
KuPR (13.6 GHz) swath width245 km
Microwave radiometer swath width 800km
KaPR (35.5 GHz) swath width120 km
5km
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GPM/DPR development schedule
Reviews in JAXA
DLR
PRR1
PRR2
CDR
Launch
PDR
PQR/PSR
Init.C/O
Normal Operation
Preliminary Design
Critical Design
Conceptual Design
Sustaining Design
Investigation
PFM (KuPR)
S/C-system Support
TR-unit BBM
Key Device Development
EM (KuPR)
Launch Operation (NASA/JAXA)
STM (KuPR,KaPR)
PFM (KaPR)
BBM (NICT)
Key Device Dev.
EM (NICT)
DPR integ
15 months
Integration MST
Normal Operation
Ground System Design Fabrication
Conceptual Design
OperTrain
Init Oper
Cal/Val
Investigation
Algorithm Examination
Algorithm Test/Improvement, Application and
Validation
Algorithm Development
RA
RI
RI
Research and Utilization
Investigation
Critical Design
Preliminary Design
FM Fabrication Assembly
Install Test
PQR/PSR
CDR
PDR
SCR
PRR Project Readiness Review, PIDR Preliminary
Interface Design Review, PDR Preliminary Design
Review, CDR Critical Design Review, MST
Mission Simulation Test, PQR Post
Qualification-test Review, PSR Pre-Shipment
Review, DLR Delivery Review, T/R-unit
Transmitter/Receiver unit, RF-unit
Radio-Frequency unit (including antenna and T/R
component)
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GPM/DPR Program JAXA Progress

• Project Readiness Review 1 successfully
  completed on August 25, 2003.
• GPM/DPR project team started on Oct. 1, 2003 in
  Tsukuba space center. 4 full time staffs for DPR
  development program management support.
• Phase B study of DPR completed by JAXA.
• KuPR T/R module key device development and BBM
  design completed by JAXA.
• KaPR T/R unit BBM completed and EM design
  underway by NICT.
• Task sharing discussion with NICT completed.

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GPM/DPR Program JAXA Progress

• GPM Asian workshop successfully held on Feb.2-3
  with participation from 12 Asian countries and
  NASA.
• GPM/DPR mission requirement reviewed in the GPM
  utilization study meeting (precursor of the
  Japanese GPM science team meeting) on Feb.13,
  with participation of the scientists
  utilization organizations (JMA, Infrastructure
  Development Institute, etc. )

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GPM/DPR Program JAXA Progress

• JAXA GPM Research Invitation for algorithm
  development issued and three scientists selected.
  Prof.Nakamura (Nagoya Univ.), Dr.Iguchi (NICT),
  Dr. T.Oki (Tokyo Univ.)
• 2nd GDaWG successfully held at EORC
• Ground system conceptual study completed.

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JAXA GPM/DPR Organization
Green Tsukuba Blue Tokyo
President (Mr. Yamanouchi)
GPM science team Prof. Nakamura
Executive Director(Dr. Furuhama)
TRMM science team
Program director(Mr. Katagi)
Red GPM/DPR Project
EORC Mr. Otsuki
International relationshipIshida
GPM/TRMM Program Kojima
Data Analysis Validation Tanaka Yamane, Oki,
Shimizu
GPM/DPR Project (Sensor) Kojima Furukawa, Satoh,
Senbokuya
Ground system Tsuchiya Takeshima Nio
Application Matsuura Amano
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Cooperation with NICT

• NICT develops the KaPR electrical system up to EM
  phase
• NICT plays important role in DPR Cal/Val, DPR
  algorithm development, and science
• NICT provides Active Radar Calibrator (ARC)

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JAXA GPM/DPR Member List