GOES-R Direct Readout Implications Richard G. Reynolds GOES-R Ground Segment Project

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GOES-R Direct Readout ImplicationsRichard G.
ReynoldsGOES-R Ground Segment Project

• 6th GOES User Conference
• Session 5 GOES-R User Readiness
• 830-1015 am / Wednesday November 4

An update of the presentation to the Direct
Readout Users Conference By Wilfred E. Mazur Jr.
- December 11, 2008
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Topics

• Direct Readout Services
• GOES-R Program Status
• New Instruments for GOES-R
• GOES-R Frequency Plan
• Implications to Communications Services
• GRB and Dual Polarization
• GRB Receive Systems
• EMWIN LRIT Become HRIT/EMWIN
• Emulated GVAR (eGVAR)
• DCS
• SARSAT
• Multi-Use Data Link (MDL)

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Direct Readout Services Overview
GOES Rebroadcast (GRB)
Emulated GOES Variable (eGVAR)
High Rate Information Transmission / Emergency
Managers Weather Information Network (HRIT/EMWIN)
Data Collection System (DCS)
Search and Rescue Satellite Aided Tracking
(SARSAT)
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GOES-R Program Status

• Instrument Contracts ABI / SUVI / EXIS / SEISS
  / GLM
• All Under Contract
• Spacecraft Contract
• July 22. 2009 Lockheed-Martin
• Denver, Colorado
  NNG07193033J, NNG08193033R /
• http//prod.nais.nasa.gov/cgi-bin/eps/bizops.cg
  i?grDpin51
• Ground Segment Contract
• May 27, 2009 Harris Corporation
• Melbourne, Florida DG133E-08-RP-0068
• http//www.fedbizopps.gov
• Antenna System Acquisition
• October 22, 2009 Proposals Received and
  Undergoing Evaluation
• GOES-R Access Subsystem (GAS) / Ancillary Data
  Relay System (ADRS) / HRIT/EMWIN Domain-5
  Upgrade / Data Collection System IF Compatibility
  
• RFP to be Released Soon

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GOES-West 137 West
GOES-East 75 West
Data
Command control, data
Data
Direct Readout Users
Command control, data
Remote Backup (RBU) Facility Fairmont, WV
NOAA Satellite Operations Facility
(NSOF) Suitland, MD
Wallops Command and Data Acquisition Station
(WCDAS) Wallops, VA
GOES-R System Configuration
06/19/2008 v2
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Instrument Performance
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Instrument Data Delivery
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Instrument Raw Data Rate Comparison
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GOES-R Frequency Plan
DOWNLINKS (RAW DATA DOWNLINK AT 8220 MHz NOT
SHOWN)
HRIT/EMWIN BPSK 1697.4 MHz
DCPC CDMA 468.775 MHz 468.825 MHz
DCPR FDM 1683.3 MHz 1683.6 MHz
CDA Telemetry BPSK 1696.3 MHz
DSN Telem Rng BPSK/PM 2211.04 MHz
SAR FDM 1544.550 MHz
GRB (dual pol) 1690.0 MHz
Radiosondes 1675 to 1683 MHz
470
1675
1680
1685
1690
1695
1700
2210
1545
1670
DCPC CDMA 2032.775 MHz 2032.825 MHz
UPLINKS
Command BPSK 2034.2 MHz
GRB (dual pol) 7220.0 MHz
EMWIN-LRIT BPSK 2028.4 MHz
DCPR FDM/8PSK 401.9 MHz 402.2 MHz
Command and Ranging BPSK 2036.0 MHz
SAR FDM/Bi-F 406.05 MHz
400
2025
2030
2035
7210
7215
7220
7225
405
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GOES-R Rebroadcast (GRB)

• Provides full resolution products from all
  instruments
• All data will be calibrated and navigated (Level
  1b)
• Except GLM will be higher level products
  (Level 2)
• Events, Groups, and Flashes
• Replaces current GVAR service
• 31 Mbps vs. 2.1 Mbps
• 15.5 Mbps/polarizationplus coding overhead
• NRZ-M and Randomized
• Direct Readout (DRO) receive systems specified
  for same size antennas (G/T of 15.2 dB/K),
  however with significant changes
• New center frequency 1690.0 MHz vs. 1685.7 MHz
• High-level modulation (e.g. QPSK, OQPSK or 8-PSK,
  TBD) vs. BPSK
• Dual polarization requiring feed changes and
  dual receiver chains
• CCSDS packet formatting

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GOES-R Rebroadcast (GRB) (Continued)

• Forward error detection coding (Rate 3/5
  BCH/LDPC) to reduce required C/No.
• DVB-S2 link characteristics and compatibility
  under consideration
• System specified for 2.5 dB margin
• Left-Hand Circular Polarization (LHCP) to provide
• ABI 0.64, 3.9, 6.185, 7.34, 11.2, 12.3,
  13.3 micron channels
• Right-Hand Circular Polarization (RHCP) to
  provide
• Remaining nine ABI channels, plus all other
  instruments

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GRB 99.99 Availability Coverage
0.01 Exceedence of 22 dB interference level
based on Initial Bound Equation determined by
the conducted measurements and the ITU-R 0.01
rain rate for given areas in the GOES antenna
footprint.
Interference Level
Interference level could be exceeded in the DARK
BLUE area
GOES West
GOES East
Some locations near the equator may experience a
reduced, but positive, margin under expected
worst case conditions
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One Concept for a GRB Small User Receive System
Downconverter
Data
Antenna

Feed

Demodulator
Aggregator
Filter
LNA
90
deg
Demodulator
RHCP
Hybrid
Data
Handling
Filter
LNA
LHCP
Storage
Demodulator
DVB-S2 PCI Card Receiver 750/polarization 300 for a PCI-Card 450 for an equivalent new PC from Dell
Data Aggregator 450 for an equivalent new PC from Dell
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Emulated GVAR (eGVAR)

• As a contingency capability, and to give users
  additional time to transition from GVAR to GRB,
  eGVAR will provide GOES-R Imagery to Users
  capable of receiving todays GVAR data stream
• Will be broadcast through a GOES I/P Series
  Satellite
• The signal will have the GVAR characteristics
• Same transmit frequency (1685.7 MHz) and power
  levels
• Same GVAR data rate (2.11 Mbps) and format
• Five Similar Imager channel wavelengths (Based on
  ABI channels 0.64, 4.9, 6.19, 11.2, 13.3 µm)
• Imagery will be mapped to GOES NOP temporal and
  spatial resolution
• No Sounder data
• One full-earth disk every 30-minutes
• No Mesoscale data No Rapid Scan No Super
  Rapid Scan

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Emulated GVAR (eGVAR) (Continued)

• Not an option for long-term use
• Will only be operational based on assessments of
  end user readiness near the time for GOES-R
  operations
• Presumes a spare satellite is available
• Users must not be lax in preparing for actual
  GOES-R (i.e., GRB) readiness

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GRB eGVAR Flows
GOES-R Satellite
GOES-I/P Series Satellite
GOES-N/O/P SSGS
Product Generation GRB
Product Gen eGVAR GRB
Legend Instrument Raw Data downlink GRB relay
uplink eGVAR relay uplink GRB RF
Broadcast eGVAR RF Broadcast Terrestrial/Network
Comm
eGVAR User
GRB User
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HRIT/EMWIN

• Successor to individual Low Rate Image
  Transmission broadcast (LRIT) and the Emergency
  Managers Weather Information Network broadcast
  (EMWIN) combined onto one carrier.
• Frequency change from 1691.0 MHz/1692.7 MHz to
  1694.7 MHz
• Higher data rate 921 Kbps
• Provides growth path for both Services to a
  combined 400 Kbps
• LRIT currently 128 Kbps
• EMWIN currently
• 9.6 Kbps (GOES 1112), 19.2 Kbps for GOES 13-15.
• Will utilize BPSK modulation w/ convolutional and
  Reed-Solomon coding
• Same as LRIT, but higher data rate
• Allows maximum EIRP from satellite due to Power
  Spectral Density restrictions
• EMWIN Users modulation type changes from uncoded
  FSK (GOES I-M) and from coded OQPSK (GOES-NOP) to
  coded BPSK at much higher data rate.

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HRIT/EMWIN (Continued)

• Name change to High Rate Information Transmission
  (HRIT) required by CGMS categorization of
  services
• Virtual Channel Data Units used to separate HRIT
  and EMWIN data
• CCSCS Virtual channels as used in LRIT today
• Prototype Software Defined Radio developed and
  demonstrated
• One hardware/software configuration can receive
  all current and future EMWIN, LRIT and HIRT/EMWIN
  signals with NO hardware changes or upgrades
  (GOES I-S compatible). No user transition
  necessary.
• Technology demonstration to proves low cost,
  PC-based terminals are possible for all data
  rates and modulation types
• Performance data, Hardware design and software
  design is available on WWW.GOES-R .GOV
• Development performed for GOES-R Program by
  Aerospace Corp.
• Presentation and Demonstrations provided last
  night

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HRIT/EMWIN Ground Data Flow (Per satellite)
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GOES Data Collection System
GOES Data Collection System
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GOES Data Collection System

• GOES-DCS consists of two communication Services
• Data Collection Platform Receive (DCPR)
• Data Collection Command (DCPC) Previously
  Interrogate (DCPI)
• GOES-R will support the ongoing evolution toward
  greater channel efficiency and system capacity
• Narrower DCPR channel assignments allowing both
  East and West satellites to each support 200
  simultaneous platform signals, with a total
  system capacity of about 72,000 platforms
• A new DCPC service, based on CDMA techniques,
  currently in prototype development. This
  user-funded development concept will allow one
  command channel on each GOES NOP Series satellite
  and two channels on each GOES-R Series satellite
• Direct Broadcast of DCPR to User systems having
  15.0 G/T will continue to be supported, but .

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GOES Data Collection System (Continued)

• Summary of Changes to GOES-DCS for GOES-R Series
• DCP uplink transmit power reduced, in accordance
  with latest DCP Certification Specifications
• DCPR uplink frequencies will be unchanged
• DCPR Downlink frequencies will be shifted from
  1694.5-1694.8 MHz to 1683.3-1683.6 MHz
• Will require change in channel demodulator
  frequency
• DCPI becomes DCPC
• Will be compatible with on-going User-funded
  developments compatible with current satellites
• Able to support a second DCPC channel

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SARSAT
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SARSAT

• Signal characteristics of the SARSAT service will
  be slightly modified for GOES-R
• Up and down-link center frequencies remain the
  same
• GOES-R will transpond, rather than re-modulate,
  the up-link band
• Will require configuration changes to the LUT
  receiver
• To account for degraded Beacons, GOES-R will
  operate with 32 dBm uplink power (versus 36 dBm
  for GOES-NOP)
• Provides improved capability to support beacons
  with weak signals
• Transponder will also operate with a minimum of
  10 uplink beacons simultaneously
• Conforms to COSPAS/SARSAT Specification T001,
  Issue 3 Revision 8 dated Nov 2007

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Other Changes of Potential Interest

• All raw instrument data will be transmitted to
  the ground in X-Band vs. todays S-Band
• X-band provides spot beam geographical coverage
  vs. hemispheric
• Processed to Level 1B and re-broadcast to users
  via the GRB link
• Diagnostic telemetry will be available via a new
  higher data rate telemetry link (32 Kbps)
• CDA telemetry downlink changes from 1694.0 MHz
  to 1696.3 MHz
• The Multi-use Data Link (MDL) is eliminated for
  GOES-R Series

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Summary

• System requirements, communications requirements,
  and the Ground Segment architecture have been
  defined for the entire system, including Direct
  Readout Services
• Detailed definition of communication link
  characteristics have not yet been fully finalized
  and will be refined through the Spacecraft and
  Ground Segment contract design processes
  However the GOES-R baseline is
• GRB will replace all current forms of instrument
  data broadcast
• Full resolution
• Geo-located
• Calibrated
• In essentially real-time
• EMWIN and LRIT will be combined and enhanced to a
  higher data rate on a new downlink frequency
  HRIT/EMWIN
• DCS will remain largely the same, however DCPR
  downlink in L-Band will have a frequency shift
• SARSAT will be essentially unchanged

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Summary (Continued)

• Documentation for the Direct Readout User
  community will be produced by the GOES-R Ground
  System contractor as CDRLs.
• Of particular note, the GS Contractor (Harris
  Corporation) will be developing a Product User's
  Guide (PUG) that will include a section on
  building a GRB receive system

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Back-up
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GOES N/O/P Frequency Plan
DOWNLINKS
EMWIN QPSK 1692.7 MHz
Radiosondes use 1675 to 1683 MHz
CDA Telem Bi-F 1694.0 MHz
LRIT BPSK 1691.0 MHz
DCPI BPSK 468.825 MHz and 12.5 kHz
DSN Telem BPSK/PM 2209.086 MHz
PDR BPSK 1685.7 MHz
SAR FDM 1544.550 MHz
MDL QPSK 1681.478 MHz
SD UQPSK 1676.0 MHz
DCPR FDM/8PSK 1694.5 MHz 1694.8 MHz
1675
1680
1685
1690
1695
1700
2210
1545
1670
470
EMWIN QPSK 2034.7 MHz
UPLINKS
Command BPSK 2034.2 MHz
DCPI BPSK 2034.8875 MHz 2034.9000 MHz 2034.9125
MHz
PDR 2.11 Mbps 2027.7 MHz
DCPR FDM/8PSK 401.9 MHz 402.2 MHz
LRIT BPSK 2033.0 MHz
SAR FDM/Bi-F 406.05 MHz 406.025 MHz
2025
2030
2035
400
405