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GPM Ground System Overview and Mission Data Flow Tracking and Data Relay Satellite System (TDRSS) provides forward link and return link services for GPM command transmission to the satellite and telemetry data receiving from the satellite. The TDRSS Ground Terminal at White Sands interfaces with Mission Operations Center (MOC) at NASA/Goddard Space Flight Center (GSFC) to receive commands and delivers telemetry and to exchange schedule, status, and service control information via NASA Integrated Services Network (NISN). NASA/MOC receives telemetry from space-ground link, and performs protocol processing to close space/ground file delivery protocol (CCSDS File Delivery Protocol: CFDP), then to deliver 5-minute duration science instrument, housekeeping files, and ancillary data to the Precipitation Processing System (PPS). JAXA GPM Mission Operation System (GPM-MOS) in Tsukuba Space Center receives these GPM mission data through NASA/PPS. These data flows are shown in Figure 1. In JAXA, GPM-MOS produce DPR and GSMaP products in near-real time and production to deliver them via JAXA Earth observation satellite data distribution system named as “G-Portal”. And the other US-Japan Joint GPM standard products are also available from G-Portal. GPM product list is shown in Table 1. GPM Product Latency DPR science data will be dumped once or twice per orbit by TDRSS-SA (TDRSS Single Access) 2.3 Mbps. On the other hand, the GMI science data will be dumped continuously by TDRSS-MA (TDRSS Multiple Access) 230 kbps link in addition to SA passes, which improves data latency for end users. By the TDRSS access, automatic ground system operations and performance improvement of ground system processing and network communication throughput, the target of GPM data latency is much better than the Tropical Rainfall Measuring Mission (TRMM). The target and results are shown in Table 2.
JAXA GPM Mission Operation system overview and GPM data distribution from G-Portal
Author: Tomomi Nio, Toshiyuki Konishi, Norio Saito, Mitsuhiko Fuda, Naoaki Ikeda, Akari Yoneyama, Yoko Fujita and Yousuke Ikehata Mission Operations System office of Space applications mission directorate (MOSS), Japan Aerospace Exploration Agency (JAXA) GPM Ground System Overview and Data Flow
Table 1 : GPM Product List
Earth Observation Data Distribution from JAXA
10th GSIM, 1 June 2011
GPM Core Observatory
GPM science teams & end
users
Instrument Data
Science Data White Sands
Ground Station
Command, Telemetry
Instrument Data
TDRSS
Partner Ground Systems
Planned/Existing Spacecraft
Partner Constellation Spacecraft
NASA Precipitation Processing
System (PPS) Instrument Data NASA Mission
Operation Center(MOC)
JAXA Mission Operation
System (MOS)
RF Communications -realtime telemetry -stored telemetry (5 min file) : CCSDS File Delivery Protocol (CFDP) S-band TDRSS MA RTN @ 230 Kbps S-band TDRSS SA RTN @ 2.3 Mbps
STORM
Products GPM (Sept.-Oct. average time/ archived %) TRMM (July 8-14, 1 week average) GMI/TMI L1B GMI L1B-rt: 21 min, 99.6%
(requirement:≦1 hr after observation, 90% of the time) TMI 1B11-rt: 2 hr 37min
DPR/PR L2 DPR L2-rt: 1 hr 10 min, 99.2%
(requirement:≦3 hr after observation) PR 2A25-rt: 2 hr 38 min
DPR/GMI COMB L2
1 hr 20 min, 98.9% (requirement:≦3 hr after observation, 90% of the time)
N/A
Figure 1 : GPM Ground System Overview and GPM Mission Data Flow
(C)1. Search by physical quantities 2. Select period and region 3. View result
(A) Users can search products by physical quantities or satellites/sensors.
(B)Users can directly get products by sftp.
Data Utilization Information For data usage, data format specification and notice/caveats on data are available linked from G-Portal. When access G-Portal website like in Figure 2-(A), there is a link for “operation information”. GPM mission provides • Product List: User can see which data is available, and
which product version are latest one. • Data document: Uer can get format specification, ATBD,
data utilization handobook. • GPM missing data list: Users have to take care to usage
of data in commissioning phase for off-nominal data. • Tool: I/O toolkit and Viewer (PPS THOR) is available.
Figure 2: G-Portal captures (A) web home page (B) sftp direct get image(C) steps of search & download
Processing Level
Product [Product Identifier/
Algorithm Key] Key Parameters File
coverage
Latest Product Version
1
KuPR L1B [DUB] Received Power GPM orbit
(Gorbit*) Ver. 03B
KaPR L1B [DAB] Received Power Gorbit Ver. 03B
GMI L1B [G1B] Brightness Temperature (Tb) Gorbit Ver. 03B
GMI L1C [G1C] Brightness Temperature (Tb) Gorbit Ver. 03B
Constellation L1C Inter-calibrated Brightness Temperature (Tb) 1 orbit
Ver. 02A, Ver. 03A for
AMSR2
2
KuPR L2 [DU2] Reflectivities, 3D Precipitation Gorbit Ver. 03B
KaPR L2 [DA2] Reflectivities, 3D Precipitation Gorbit Ver. 03B
DPR L2 [DD2]
Dual Frequency Retrievals, 3D precipitation Gorbit Ver. 03B
GMI L2 [GL2]
Precipitation, Total Precipitable Water Gorbit Ver. 03C
DPR-GMI Comb L2 [CL2]
DPR-GMI retrieval. 3D Precipitation Gorbit Ver. 03C
3
DPR L3 Daily (TEXT) [D3D] Precipitation 0.1°x 0.1°
Daily
Ver. 03C DPR L3 Daily(HDF5) [D3Q] Precipitation 0.25° x 0.25°
Daily
DPR L3 Monthly [D3M] Precipitation 0.25° x 0.25°
Monthly
GMI L3 Monthly [GL3] Precipitation 0.25° x 0.25°
Monthly Ver. 03C
DPR-GMI Comb L3 [CL3] Precipitation 0.25° x 0.25°
Monthly Ver. 03C
GSMaP Hourly (TEXT) [MCT]
Precipitation including retrievals from partner microwave sensors; -GPM/GMI (2014.3.14~) -TRMM/TMI -DMSP-F16/SSMIS -DMSP-F17,18/SSMIS -GCOM-W/AMSR2 -METOP-A,B/AMSU-A, MHS * (No METOP-A/MHS data 3/27-5/20) -NOAA-18,19/AMSU-A, MHS
0.1°x 0.1° Hourly
Ver. 03C GSMaP Hourly (HDF5) [MCH]
0.1°x 0.1° Hourly
GSMaP Monthly [MCM]
0.1°x 0.1° Monthly
Auxiliary Data (from JMA)
Environmental data extracted KuPR swath
[DU2/ENV]
Temperature, Air Pressure, Cloud Water Vapor, Liquid Water Gorbit Ver. 03B
Environmental data extracted KaPR swath
[DA2/ENV]
Temperature, Air Pressure, Cloud Water Vapor, Liquid Water Gorbit Ver. 03B
Environmental data extracted DPR swath
[DD2/ENV]
Temperature, Air Pressure, Cloud Water Vapor, Liquid Water Gorbit Ver. 03B
* Gorbit is the GPM orbit calculated from the southern most point back to the southern most point for standard product. Near-Real-Time Product is also available except for daily or monthly products. The scene coverage of L1-L2 products are depending on the instrument mission data donwlink.
Table 2 : GPM Data Latency
G-Portal Overview G-Portal is the multi-mission dissemination infrastructure for JAXA Earth Observation Satellites including TRMM, GPM, GOSAT, ADEOS, ADEOS-II, etc. G-Portal can disseminate products on internet and without charge, except for high resolution products and/or commercial based products as ALOS , and ALOS-2 which will be coming soon. User can get products in two ways. (A)Users can search products by physical quantities and by satellites/sensors and to get selected products with thumbnails and browses. (B)Users also can obtain products by sftp. G-Portal had opened from Feb. 28, 2013, starting with TRMM and past satellites data, and GPM data was released to the public on Sep. 2, 2014. (A) https://www.gportal.jaxa.jp and (B) sftp.gportal.jaxa.jp And the catalogue data is also disseminated via CATS-I (Catalogue Transfer Service - Interface). http://catsi.jaxa.jp
HELPDESK You can contact us!! Questions about GPM mission data [email protected] How to get JAXA’s EO data [email protected]