GOES Rebroadcast Services Satya Kalluri, Randy Race, Andrew
GOES Rebroadcast Services Satya Kalluri, Randy Race, Andrew Royle GOES-R Ground Segment Project Code 417 Building 6, S217 NASA Goddard Space Flight Center Greenbelt, MD 20771 [email protected] 2/19/20 2011 Satellite Direct Readout Conference 1 GOES Constellation Geostationary at 22,300 miles 75o W GOES-East 137o W GOES-West Instruments: ABI Imager GLM Lightning Mapper SEISS SUVI Space & Solar
EXIS MAG 2/19/20 105o W On-Orbit Storage (before operational) Products Tested at 89.5o W (before Storage) GOES-R Ground Segment Project Status Review 2 GOES-R System Operational View MM: Mission Management EM: Enterprise Management PG: Product Generation PD: Product Distribution PDA: Product Dist. & Access System Space-Ground Communication Links Raw data downlink - to Wallops primary and Fairmont remote backup ground site
GRB - RHCP GRB - RHCP GRB - LHCP GRB - LHCP HRIT/EMWIN DCPC SAR SAR L-Band L-Band L-Band UHF L-Band UHF UHF Key UHF
L-Band X-Band S-Band L-Band DCPR DCPR UPLINK DOWNLINK 2/19/20 2011 Satellite Seven elements - Raw data downlink and six bent pipe transponders Direct Readout Conference 4 X-Band Raw Sensor Data HRIT/EMWIN DCPC S-Band
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 S-Band GRB transponders - Dual polarized X-band uplink to dual polarized L-band Earth coverage downlink, 12 MHz bandwidth x quantity 2 X-Band 100 Mbps data rate (120 Mbps after CCSDS Overhead, 7/8 LDPC coding, and fill from C&DH) X-Band GRB 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 todays GOES Variable format (GVAR). ABI, GLM, SUVI, EXIS, SEISS, Magnetometer GOES-R has about 2742% more data than GOES-P GVAR and GRB comparison GVAR Full Disk Image 30 minutes GOES Rebroadcast 5 minutes (GRB) (Mode 4) 15 min (Mode 3) 2/19/20 Other modes Rapid Scan, Super Rapid Scan Polarization None 3000 km x 5000 km CONUS: 5 min 1000 km x 1000 km Mesoscale: 30 sec
Dual circular polarized Receive Frequency 1685.7 MHz (L-band) 1675-1695 MHz (L-band) Data Rate 2.11 Mbps ~30 Mbps Antenna Coverage Earth coverage to 5 Earth coverage to 5 Data Sources Imager and Sounder Space Weather None ABI (16 bands), GLM, SEISS, EXIS, SUVI, MAG ~2 Mbps Lightning Data
~0.5 Mbps None 2011 Satellite Direct Readout Conference 6 ABI Data Characteristics ABI is the largest component of GRB 16-band image with different sampling structures 1 band has 21568x21568 pixels 3 bands have 10784x10784 pixels 12 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 2/19/20 1000m/pixel 2011 Satellite Direct Readout Conference 2000m/pixel 7 Modeling done by Carr Astro
How is GRB created? Raw data down linked at Wallops in X-band Unpack data and create L0 Create L1b radiances from L0 Apply lossless compression Create CCSDS packets Multiplex Buffer Create fill packets Channel synchronization and framing Forward error correction, modulation and coding Up-convert and transmit GRB Downlink Characteristics Content (specified for each of two polarization channels: LHCP, RHCP)
Data rate Inner Frame Format: CCSDS Space Packet Outer Frame Format: DVB-S2 Coding JPEG2000 and SZIP are candidates that are being considered/studies Format 31 Mbps maximum data rate 15.5 Mbps instantaneous maximum for each polarization channel Down link margin: 2.5 db Compression - Lossless compression required
L1b data, QC data and metadata: ABI, SUVI, EXIS, SEISS, MAG L2 data, QC data, metadata: GLM GRB Information Packets BCH + LDPC (2/3) for 8-PSK or LDPC (9/10) for QPSK Modem Required C/No (dB-Hz): 78.6 Required Eb/No (dB) for 1x10-10 BER: 4.8 System G/T (dB/K) : 15.2 2/19/20 2011 Satellite Direct Readout Conference These specs should be considered preliminary and will be finalized in 2012 9 Dual Polarized Signal GRB 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 products Ensures 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). 2/19/20 GOES-R Ground Segment Project Status Review 10 GRB Data Rate ABI data drives the GRB data rate Lossless compression results in variable GRB data rate 2/19/20 2011 Satellite Direct Readout Conference 11 Modeling done by AER GRB Channel Content Summary ABI L1b image Data (compressed)
ABI QC bits Metadata Space packet overhead SUVI GLM Other Info Packets SUVI L1b image Data (compressed) Metadata Space packet overhead L2 Lightning Events/ Flashes/ Groups (compressed) Metadata Space packet overhead L1b EXIS, MAG, SEISS science data Metadata Space packet overhead Note: This is a catalog of the contents and not a sequential
organization of the stream Included in 15.5 Mbps Bandwidth allocation per channel 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) GRB Information Packets CFDP Overhead
Space packet overhead Channel Synchronization and Coding Error Correction 2/19/20 2011 Satellite Direct Readout Conference 12 GRB Resources for Users 5 GRB Simulators available in 2013 GOES-R Product Users Guide Draft available now; final in 2012 Describes the format and content of GRB data GRB Downlink Specification Document for Users available in 2012 Provides GOES Rebroadcast radio frequency downlink characteristics, to enable the user community to develop GRB receivers 2/19/20 2011 Satellite Direct Readout Conference 13 GRB Simulators Purpose On-site testing of user ingest and data handling systems, aka GRB field terminal sites Simulates 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 2013 Key Capabilities and Features Transportable Fully self contained Configurable hardware units Outputs simulated GRB Off-line Mode to create and setup configurations and scenarios Also, 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 2/19/20 2011 Satellite Direct Readout Conference 14 GRB Simulator Simulated data/test patterns Binary/PNG/JPEG Modulator GRB signal in Baseband and IF Frequencies
2/19/20 CCSDS packets in LHCP and RHCP streams Lossless compression DVBS2 framing BCH/LDCP encoding 8-PSK or QSPK modulation 2011 Satellite Direct Readout Conference DVBS2/CCSDS Front End Processor GRB Simulator Processor Ne tw ork Swi tch Time code Reader/Generator 15 Summary GOES Rebroadcast and Unique Payload Services provides significant improvements in quality of data compared to legacy GOES systems GOES-R Program is taking steps to identify
user impacts and work with the direct readout community to support transition to new service Acknowledgements GOES-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 Dittberner Updated 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
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