1. 11 GOES-R User Requirements Change Process Barbara Pfarr Bill Mazur Monica Todirita GOES-R Program Systems Engineering

2. 2 GOES-R Requirements Evolution Key Decision Points (KDP): Launch Readiness 19992005 2007 2014 REQUIREMENTS B C/D System Architecture Government and Industry Studies Phase Program Definition & Risk Reduction (PDRR) Phase Acquisition and Operations (A&O) Phase 2008 NWS ORD 1999 GUC May 2001 GUC Oct 2002 GUC May 2004 GUC May 2006 GUC Jan 2008 MRD 2’ 2005 MRD 3 2007 LIRD 2007 Requirements Documents GOES Users Conferences GPRD 2004 CORL MCP 2007 NASA/MOU 7120.5D Project Plans Level I Level II Level IIa Level III / Level IIIa Project Interface Documents & Specifications Update TBD Update TBD ACRONYMS CORLConsolidated Observational Requirements ListMOUMemorandum of Understanding GPRDGOES Program Requirements DocumentMRDMission Requirements Document GUCGOES Users ConferenceORDOperational Requirements Document LIRDLevel I Requirements DocumentNWSNational Weather Service MRD 1 2003

3. 3 NWS Operational Requirements Document (ORD) circa. 1999 Top Priorities  Operation of sensors through eclipse and “keep-out-zones.”  Resolution of imaging conflict among climatic, synoptic, and mesoscale requirements.  Improved time and space resolution for the imager sensor. XImproved spatial coverage of the sounder sensor.

4. 4 Other Users National Weather Service (NWS) Oceanic & Atmospheric Research (OAR) National Ocean Service (NOS) National Marine Fisheries Service (NMFS) NOAA Marine & Aviation Operations (NMAO) Program Planning & Integration (PPI) NOAA Users National Environmental Satellite, Data & Information Service (NESDIS) Ecosystems, Weather & Water, Climate, Commerce & Transportation L1RD Aerosols Precipitation Atmospheric Profiles Ocean Space & Solar Clouds Land Requirements Atmospheric Radiance Atmospheric Winds Coastal Waters & Estuaries Mapping Requirements To GOES-R Approved System Solutions Spacecraft Upcoming Procure- ments Instruments Ground Segment MRD Instruments Advanced Baseline Imager (ABI) EUVS / XRS Irradiance Sensor (EXIS) Solar Ultra Violet Imager (SUVI) Space Environment In- Situ Suite (SEISS) Geostationary Lightning Mapper (GLM)

5. 5 GOES-R Requirements Process During Acquisition and Operations Stability and clarity of requirements critical to successful implementation; As costs and implementation difficulties become apparent requirement updates may be necessary; Challenges for the Acquisition & Operations Phase: –As products and services become available to the current series, these “Legacy” products must be integrated into the to- be-delivered GOES-R system. –As technologies mature and funding is made available, additional new products and services may be added. –As National priorities change, requirements will be reviewed and updated.

6. 6 GOES-R Requirements Documents Hierarchy Requirement Level Baseline Document Document Custodian & Control Process Reviewing BodyApproving Body NOAA Observing Systems Architecture (NOSA) Consolidated Observational Requirements List (CORL) NOAA Observing Systems Council (NOSC) NOAA Executive Council (NEC) Level I GOES-R Level I Requirements Documents GOES-R Program Office (GPO) NOSC, NOAA PMC, NESDIS AA/DAA NOAA DUS Level II GOES-R Management Control Plan GPO NESDIS AA/DAA NASA/GSFC PMC NESDIS AA, NASA/GSFC Center Director Level IIa Mission Requirements Document GPO GOES-R Operational Requirements Working Group (GORWG) GPO GOES-R SPD Level III GOES-R Project Plans GOES-R Projects GPO GOES-R SPD Level IIIa Project Level Interface Documents and Functional Specifications GOES-R Projects GPO GOES-R Project Managers

7. 7 User Request for Change Process User Request CORL Implement Request Non- Level 1 and funding available Level 1 and / or funding required CORLConsolidated Observational Requirements List ECRBEngineering Change Review Board GORWGGOES-R Operational Requirements Working Group GPOGOES-R Program Office PMCProgram Management Council TAPTechnical Advisory Panel GORWG Review / Analysis ECRB Review (GPO) Scientific Analysis (TAP) CCB Disposition / Approval (GPO) PMC Approval Validation

8. 8 Example of a User Requirements Change Currently Under Consideration Desired Growth in the capacity for the EMWIN and LRIT Communication Services The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

9. 9 Command and Data Acquisition Station Wallops, VA NOAA Satellite Operations Facility Suitland, MD (LRIT Source) EMWIN CC Silver Spring, MD (EMWIN Source) GOES NOP Series GOES-R Series Combination of Emergency Managers Weather Information Network (EMWIN) and Low Rate Information Transmission (LRIT) Services Combination of Emergency Managers Weather Information Network (EMWIN) and Low Rate Information Transmission (LRIT) Services Separate EMWIN/LRIT Combined EMWIN/LRIT EMWIN User EMWIN User LRIT User The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

10. 10 EMWIN and LRIT Characteristics Currently the two services have separate broadcasts through each GOES satellite (East and West): –EMWIN: 9.6Kbps FM signal, 1690.725 MHz (GOES I-M series) 19.2 Kbps OQPSK CCSDS packetized signal, 1692.7 MHz (GOES NOP series) Users utilize ~1 meter antenna –LRIT: 128 Kbps BPSK CCSDS packetized signal, 1691.0 MHz Users utilize ~1.2 meter antenna Both User communities desire greater capacity for more products The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

11. 11 EMWIN and LRIT Concerns and Proposed Solution Concern about impact to cost, complexity and transition difficulties to higher data rate service –Bandwidth available for the entire GOES-R communications requirement is limited –Impact to Users terminals-- particularly for EMWIN Must be very portable Users have limited budget/resources Candidate GOES-R solution: –EMWIN and LRIT combined with a data rate greater than both current services –Design the satellite to transmit sufficient power that Users can still utilize ~1 meter antennas –Separate Virtual channels for each service--allow users to receive the content of either or both services –With software-based receiver technology, user terminals can be designed to receive all past and future formats with no hardware changes LRIT I, LRIT N EMWIN IEMWIN N EMWIN I EMWIN N LRIT I/N EMWIN/LRIT The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

12. 12 PROs and CONs BENEFITS: –Allows desired increase in throughput capacity for both services. –Allows commonality of user receive systems. –Reduces cost/complexity of Spacecraft. –Both Services retain the ability to use the same relatively small antennas with the new higher data rate. –Reduces spectrum requirements: Added benefit--allows critical S/C telemetry signal to be included in the GOES frequency band. CHALLENGES: –Another change for the current users. However: New frequencies are necessary, but the GRB broadcast requirement (31 Mbps) forces a reallocation of the L-band frequencies anyway. New data rates are required to satisfy User-stated growth needs. –Transition Concerns between legacy GOES and GOES-R The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

13. 13 User Concern Mitigation: Prototyping the solution The GOES-R Program plans to demonstrate a prototype very low cost EMWIN/LRIT receiver based on “Software Defined Radio” techniques which will: –Receive both services in any GOES I-M, N-P or –R+ frequencies, data rates and modulation types. –Receiver signal processing to be performed by a simple USB interface board in conjunction with a standard PC. Design for a prototype interface to be provided to the User community –Utilize GOES-R developed software--source code which would be available to the User communities. –Anticipate demonstration of a prototype in mid-2008. Ettus Universal Software Radio Peripheral (USRP) early prototype The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

14. 14 Impacts to Requirements Documentation The proposed solution still supports the EMWIN and LRIT services. –Therefore the Level 1 Requirements are unaffected The MRD defines the unique properties of EMWIN and LRIT through unique Spacecraft-to-Ground Interface Requirements Documents (IRDs). –Existing separate IRDs for EMWIN and LRIT (417-R-IRD-0004 & 417-R-IRD-0003) to be merged –A new IRD, for the combined service, is being created and will be referenced for both service requirements No cost impacts are required for implementation. –Savings on the satellite communication system will fund the development of the demonstration prototype. The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

15. 15 Impacts to Requirements Documentation (cont.) EMWIN MRD Req ID 463 LRIT MRD Req ID 467 Flight Project F&PS IDs XXX Ground Project F&PS IDs XXX Combined LRIT/EMWIN IRD End results: one spacecraft transponder, one common receive system Old LRIT IRD Old EMWIN IRD Old Reference Old Reference New Reference The Government's firm requirement will be defined in the draft solicitation and subsequent final solicitation

16. 16 Upcoming NOAA-sponsored Direct Read-out User Conference December 8-12, 2008 Miami, Florida