Satya Kalluri Randy Race Andrew Royle GOESR Ground Segment Project Code 417 Building 6 S217 NASA Goddard Space Flight Center Greenbelt MD 20771 satyakallurinoaagov Monday April 04 2011 ID: 806840
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GOES Rebroadcast Services
Satya Kalluri, Randy Race, Andrew RoyleGOES-R Ground Segment ProjectCode 417 Building 6, S217NASA Goddard Space Flight CenterGreenbelt, MD 20771satya.kalluri@noaa.gov
Monday, April 04, 2011
2011 Satellite Direct Readout Conference
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Slide2GOES – Constellation
Monday, April 04, 2011GOES-R Ground Segment Project Status Review2
105
o W
On-Orbit Storage
(before operational)
Tested at 89.5
o
W
(before Storage)
Geostationary at
22,300 miles
137
o
WGOES-West
75o WGOES-East
Instruments
:
ABI Imager
GLM Lightning
MapperSEISSSUVI EXISMAG
Space & Solar
Products
Slide3MM: Mission Management
EM: Enterprise ManagementPG: Product GenerationPD: Product DistributionPDA: Product Dist. & Access SystemGOES-R System Operational View
Slide4Space-Ground Communication Links
Monday, April 04, 20112011 Satellite Direct Readout Conference4
X-Band
X-Band
GRB - RHCP
GRB - LHCP
GRB - RHCP
GRB - LHCP
UPLINK
DCPC
HRIT/EMWIN
HRIT/EMWIN
DCPCDOWNLINKSAR
DCPRSAR
DCPRS-Band
S-BandUHF
UHF
Raw Sensor Data
L-Band
L-Band
L-BandL-BandL-BandUHFX-Band
Raw data downlink - to Wallops primary and Fairmont remote backup ground site
100 Mbps data rate (120 Mbps after CCSDS Overhead, 7/8 LDPC coding, and fill from C&DH)GRB transponders - Dual polarized X-band uplink to dual polarized L-band Earth coverage downlink, 12 MHz bandwidth x quantity 2
HRIT / EMWIN transponder - S-band uplink to L-band Earth coverage downlink narrow Bandwidth transponder
SAR, DCPR – UHF uplink to L-band Earth coverage downlink narrow bandwidth transponders
DCPC - S-band uplink to UHF Earth coverage downlink narrow bandwidth transponder
Seven elements - Raw data downlink and six bent pipe transponders
Slide5GRB Data
GRB – GOES Rebroadcast (GRB)GRB will contain the Level 1b data from each of the GOES-R Series instruments and is the GOES-R Series version of today’s GOES Variable format (GVAR).ABI, GLM, SUVI, EXIS, SEISS, MagnetometerGOES-R has about 2742% more data than GOES-P
Slide6GVAR and GRB comparison
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Slide7ABI Data Characteristics
Monday, April 04, 20112011 Satellite Direct Readout Conference7ABI is the largest component of GRB16-band image with different sampling structures1 band has 21568x21568 pixels3 bands have 10784x10784 pixels12 bands have 5392x5392 pixels= 1,162,900,000 pixel per image@ ~12bit/pixel ≈ 1.6 Gigabyte per image
one image every 5 minutes in Mode 4 – 12 images/hour= 14 billion pixels per hour
500m/pixel
1000m/pixel
2000m/pixel
Modeling done by Carr Astro
Slide8How is GRB created?
Raw data down linked at Wallops in X-bandUnpack data and create L0Create L1b radiances from L0Apply lossless compressionCreate CCSDS packetsMultiplexBufferCreate fill packetsChannel synchronization and framing
Forward error correction, modulation and coding
Up-convert and transmit
Slide9GRB Downlink Characteristics
Content (specified for each of two polarization channels: LHCP, RHCP)L1b data, QC data and metadata: ABI, SUVI, EXIS, SEISS, MAGL2 data, QC data, metadata: GLMGRB Information PacketsData rate31 Mbps maximum data rate15.5 Mbps instantaneous maximum for each polarization channelDown link margin: 2.5 dbCompression - Lossless compression requiredJPEG2000 and SZIP are candidates that are being considered/studiesFormatInner Frame Format: CCSDS Space PacketOuter Frame Format: DVB-S2CodingBCH + LDPC (2/3) for 8-PSK or LDPC (9/10) for QPSKModem Required C/No (dB-Hz): 78.6Required Eb/No (dB) for 1x10-10 BER: 4.8
System G/T (dB/K) : 15.2
Monday, April 04, 2011
2011 Satellite Direct Readout Conference
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These specs should be considered preliminary and will be finalized in 2012
Slide10Dual Polarized Signal
Monday, April 04, 2011GOES-R Ground Segment Project Status Review10GRB LHCP: L1b products from ABI 0.64 um band and 6 IR bands (3.9, 6.185, 7.34, 11.2, 12.3, and 13.3 um)RHCP: L1b products from ABI bands 0.47, 0.865, 1.378, 1.61, 2.25, 6.95, 8.5, 9.6 and 10.35um, L2+ GLM, L1b SUVI, L1b EXIS, L1b SEISS, and L1b Magnetometer productsEnsures load balanced utilization of the two circular polarizations, allowing users to receive all GRB products with a dual-polarized system (both LHCP and RHCP), and allowing users flexibility to receive GOES Imager legacy channels with a single polarized system (LHCP only).
Slide11GRB Data Rate
Monday, April 04, 20112011 Satellite Direct Readout Conference11Modeling done by AER
ABI data drives the GRB data rate
Lossless compression results in variable GRB data rate
Slide12GRB Channel Content Summary
Monday, April 04, 20112011 Satellite Direct Readout Conference12
ABI
SUVI
GLM
Other
Info Packets
For each instrument: image data + metadata + CCSDS Space Packet overhead
ABI has per pixel QC bits, coded separately
ABI, SUVI, GLM compressed
GRB Info packets via CCSDS File Delivery Protocol (CFDP)
Channel synchronization and coding (link layer) for DVB-S2 or other
Error correction (LDPC) Included in 15.5 Mbps Bandwidth allocation per channelABI L1b image Data (compressed)QC bitsMetadataSpace packet overheadSUVI L1b image Data (compressed)MetadataSpace packet overheadL2 Lightning Events/ Flashes/ Groups (compressed)MetadataSpace packet overhead
L1b EXIS, MAG, SEISS science data
Metadata
Space packet overhead
GRB Information Packets
CFDP Overhead
Space packet overhead
Channel
Synchronization and Coding
Error Correction
Note: This is a catalog of the contents and not a sequential organization of the stream
Slide13GRB Resources for Users
5 GRB Simulators available in 2013GOES-R Product Users GuideDraft available now; final in 2012Describes the format and content of GRB dataGRB Downlink Specification Document for Users available in 2012Provides GOES Rebroadcast radio frequency downlink characteristics, to enable the user community to develop GRB receiversMonday, April 04, 2011
2011 Satellite Direct Readout Conference
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Slide14GRB Simulators
PurposeOn-site testing of user ingest and data handling systems, aka GRB field terminal sitesSimulates GRB downlink functionality by generating Consultative Committee for Space Data Systems (CCSDS) formatted GRB output data based on user-defined scenarios, test patterns, and proxy data files.Available in 2013Key Capabilities and FeaturesTransportableFully self containedConfigurable hardware units
Outputs simulated GRB
“Off-line Mode” to create and setup configurations and scenariosAlso, create test patterns and input proxy data
“On-line Mode” to continuously output GRB data stream at IF or baseband levels
Includes monitoring and logging of events
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Slide15Monday, April 04, 2011
2011 Satellite Direct Readout Conference15GRB Simulator
NetworkSwitch
Modulator
DVBS2/CCSDS
Front End Processor
GRB Simulator Processor
Time code
Reader/Generator
CCSDS packets in LHCP and RHCP streams
Lossless compression
DVBS2 framing
BCH/LDCP encoding 8-PSK or QSPK modulationGRB signal in Baseband and IF FrequenciesSimulated data/test patternsBinary/PNG/JPEG
Slide16Summary
GOES Rebroadcast and Unique Payload Services provides significant improvements in quality of data compared to legacy GOES systemsGOES-R Program is taking steps to identify user impacts and work with the direct readout community to support transition to new service
Slide17Acknowledgements
Slide18GOES-R Posters of Interest
The GOES-R Series Rebroadcast Service (GRB)Randall Race, Andrew Royle - GOES-R Ground Segment Project, David Hogan - AER, Inc.GOES-R GRB Simulator Kevin Gibbons, Randy Race, Cliff Miller, Ken Barnes, Cristina Bories, Gerald DittbernerUpdated Analysis of Lossless Compression Techniques for the GOES-R Rebroadcast (GRB) Sub-System Peter Finocchio, Bobby Braswell, Yuguang He, David Hogan, Daniel Hunt, Scott Zaccheo GOES Playback and Display: Interacting with Movies (Poster and PC demo)
James Carr, Michael Smith, David Zakar