1. 1 THE EMWIN TRANSITION April 27, 2004 Angelo Wade, NESDIS Ground Systems

2. 2 TOPICS BACKGROUND TRANSITION CONCEPT ACCOMPLISHMENTS

3. 3 BACKGROUND NOAA had to comply with ITU Regulations –Power Flux Density –Spurious emissions GOES N/O/P satellite design includes new EMWIN requirements –Reduced EIRP from 51 dBmi to 44.8 dBmi –Separate transponder (new freq = 1692.7 MHz) –Data Rate = 9.6 kbps –Bandwidth = 50kHz –Modulation = BPSK

4. 4 BACKGROUND (CONT.) Transition Plan written as cooperative agreement between NESDIS and NWS principals to transition users from old to new EMWIN –NESDIS serves as technical lead developing EMWIN hardware/software –NWS serves as Program lead establishing EMWIN requirements Draft Transition Plans have been created and revised frequently since 1999 to coincide with development changes

5. 5 TRANSITION CONCEPT Develop and test EMWIN-N prototype receiver as proof of concept Release of the prototype and development information to prospective vendors Broadcast GOES N-type (EMWIN-N) data stream through GOES-11 (stored) Broadcast EMWIN-N data stream through the GOES-N satellite during initial checkout period “ The Transition Concept is based on the expectation that industry, using NOAA-provided technical information, will produce commercially available receiver systems in a timely manner for the user community.”

6. 6 TRANSITION CONCEPT When to expect change in broadcast? –The current EMWIN broadcast (EMWIN-I) will most likely be available to users until 2011 if there are no catastrophic failures of major satellite subsystems or demand for newer science Change in broadcast service could occur as early as June 2005 or as late as Jan 2011 (fuel completely exhausted). –GOES-11 (currently stored on-orbit) and 12 are expected to have fuel until January and July 2011, respectively –GOES 8 an 9 are at the end of life EMWIN-I long term operations no longer feasible –GOES-10 is projected to run out of fuel mid 2005 and be replaced by GOES-11 approx. January 2006.

7. 7 TRANSITION CONCEPT GOES-N call-up scenarios from on-orbit storage –Critical Factors Satellite failure (major subsystems) NWS request new satellite –Improvement in science (e.g., better image resolution) –Better performance (e.g., precise pointing) EMWIN-N scenarios –Typical Notification of service change Users can expect 2.5 months to prepare for new service –Satellite storage to operations ~ 2.5 months based on GOES-12 replacement of GOES-8 (1 deg/day)

8. 8 TRANSITION CONCEPT Enough EMWIN-I and N overlap for users to prepare

9. 9 TRANSITION CONCEPT Planned replacement of older satellites –GOES-11 (stored) will replace GOES-10 (west) –GOES-N (not yet launched) replaces GOES-12 (east) Testing or changes to satellite operational conditions may require future Plan revisions

10. 10 ACCOMPLISHMENTS Plan signed December 17, 2003 and posted on NWS website –Subject to change as requirements evolve EMWIN-N publications released to public Receiver specifications Satellite downlink specifications Receiver User Manual and DLLs EMWIN-N transmitted through GOES-9 satellite and received successfully –Characterized (preliminary) performance of EMWIN-N system (uplink and downlink)