# Presentation: 370008

## JAXA GPM/DPR program status

***JAXA GPM/DPR program status***

**Masahiro Kojima**
**	****   ****Japan Aerospace Exploration Agency (JAXA)**
**                ****Office of Space Applications **
**                ****GPM/DPR Project Manager**
** ****	****    **
**                       **

## JAXA’s 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, DPR+MWRs 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. )

## 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 MWR’s precipitation estimation accuracy using the precipitation parameters (DSD, melting level, rain type, storm height, etc.)  derived by DPR

## Concept of precipitation measurement by the GPM core satellite

- Range resolution
- = 250m

- KuPR (13.6 GHz)
- swath width=245 km

- KaPR (35.5 GHz)
- swath width=120 km

- DPR

- GMI

- Microwave radiometer
- swath width =800km

- 5km

**Dual-frequency precipitation radar (DPR) consists of **
**Ku-band (14GHz) radar : ****KuPR**
**and **
**Ka-band (35GHz) radar : ****KaPR**

_***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**

## GPM/DPR development schedule

| Japanese Fiscal Year (April – March) | 2002 (FY14) |  |  |  | 2003 (FY15) |  |  |  | 2004 (FY16) |  |  |  | 2005 (FY17) |  |  |  | 2006 (FY18) |  |  |  | 2007 (FY19) |  |  |  | 2008 (FY20) |  |  |  | 2009 (FY21) |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 |
| Milestone

(Lower row: Review with the maker ) |  |  |  |  |  |  |  |  |            |  |  |  |              |  |  |  |  |  |  |  |  |  |  |  |      |  |  |  |  |  |  |  |
| DPR Development

KuPR (JAXA)

KaPR (CRL-JAXA)  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  
Ground System

Algorithm Development  

Research and Utilization |  |  |  |  |              |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Spacecraft Bus
(NASA) |  |  |  |  |  |  |  |  |    |  |  |  |              |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

***GPM/DPR development schedule***

- Critical Design

- Conceptual Design

- Preliminary Design

- TR-unit BBM

- BBM (NICT)

- Critical Design

- Preliminary Design

- FM Fabrication & Assembly

- Sustaining Design

- Install & Test

- Key Device Development

- Key Device Dev.

- Integration
- & MST

- Normal Operation

- Research and Utilization

- Ground System Design & Fabrication

- Algorithm Examination

- Investigation

- Investigation

- 15 months

- PRR#2

- OperTrain

- Init.C/O

- Normal Operation

- Reviews in JAXA

- Algorithm Test/Improvement, Application and Validation

- DLR

- PRR#1

- CDR

- PQR/PSR

**Launch**

- S/C-system Support

- Launch Operation
- (NASA/JAXA)

- RA

- RI

- Init Oper

- PQR/PSR

- Cal/Val

- 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)

- RI

- Algorithm Development

- Investigation

- CDR

- PDR

- SCR

- Conceptual
- Design

- PDR

- EM (NICT)

-  PFM (KuPR)

- PFM (KaPR)

- DPR integ

- EM (KuPR)

- STM (KuPR,KaPR)

## 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.

## 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. )

## 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.

## JAXA GPM/DPR Organization

- (Mr. Yamanouchi)

- Executive Director(Dr. Furuhama)

- Program director(Mr. Katagi)

**GPM/TRMM Program**
** **Kojima

- EORC
- Mr. Otsuki

**GPM/DPR Project**
**(Sensor)**
- Kojima
- Furukawa, Satoh, Senbokuya

**Ground **
**system**
- Tsuchiya
- Takeshima
- Nio

**Data Analysis **
**& Validation**** **
- Tanaka
- Yamane, Oki, Shimizu

**Application**
- Matsuura
- Amano

- GPM science team
- Prof. Nakamura

- TRMM science team

- International relationship:Ishida

- Red: GPM/DPR Project

- Green: Tsukuba
- Blue: Tokyo

## 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)

## JAXA GPM/DPR Member List

| Program | GPM/DPR Program | Mr. Kojima (Program Manager) | JAXA, DPR Project |
| --- | --- | --- | --- |
|   |   | Dr. Tanaka (Program Scientist) | JAXA, EORC |
|   | International Coordination | Mr. Ishida (Manager) | JAXA, EORC |
|   |   | Mr. Ohashi | JAXA, International Relations Dep. |
| Project | DPR | Mr. Kojima (Project Manager) | JAXA, DPR Project |
|   |   | Mr. Furukawa, Dr. Satoh, Ms. Senbokuya | JAXA, DPR Project |
|   | Ground Data Processing | Mr. Tsuchiya (Manager) | JAXA, EORC |
|   |   | Dr. Takeshima, Ms. Nio | JAXA, EORC |
|   | Data Analysis & Validation | Dr. Tanaka (Manager) | JAXA, EORC |
|   |   | Dr. R.Oki, Dr. Shimizu, Mr. Yamane | JAXA, EORC |
|   | Application | Mr. Matsuura (Manager) | JAXA, EORC |
|   |   | Mr. Amano | JAXA, EORC |
| Science Team |  | Prof. Nakamura (Project Scientist) | Nagoya University |
|   |   | Prof. Koike  | Tokyo University |
|   |   | Dr. Nakazawa | MRI |
|   |   | Prof. Sumi  | Tokyo University |
|   |   | Dr. Iguchi | CRL |
|   |   | Dr. T.Oki | Tokyo University |