Kay Metcalf NOAA GOES DCS Program Manager November 17, 2010

1. GOES Data Collection SystemStatus of Version II Transmitter ImplementationInformation Brief for TWG Kay Metcalf NOAA GOES DCS Program Manager November 17, 2010

2. Goal of Version 2 Transmitters • Decrease Width of Each Channel • From 1.5 kHz to .75 kHz for 300 baud • From 3.0 kHz to 2.25 kHz for 1200 baud • Double Number of Channels Available • From approximately 100 channels per satellite to approximately 200 channels per satellite • Increase System Capacity NOAA GOES DCS

3. Loading Capacity • Version 1.0 Loading Capacity • Standard Reporting Mode • Once per hour, for 10 seconds • Allows for 36,000 transmitters for 100 channel spacecraft • Only alternate channels used on each spacecraft • Wide beam causes most transmitters to hit both spacecraft • 2 satellites allow for 72,000 transmitters • Varying any Parameter Changes Capacity • Repeat Cycle of Transmissions • Length of Message • Allow 15 minute repeat cycle (most users requesting) • 18,000 current version fit into system on both satellites • We’ve already exceeded that with the current system • Version 2.0 Loading Capacity • Narrow band transmitters allow for 144,000 using standard mode • 15 minute repeat cycle allows 36,000 transmitters on both satellites • Users with most requirements are oceanographic users, including tsunami warning • Most require 5 or 6 minute repeat cycles • These requirements even further diminish capacity • Requirements are stringently vetted to conserve resources • Most users still constrained to hourly reporting • NOS and the Tsunami Warning Community are the exceptions NOAA GOES DCS

4. Capacity Drivers • Known Requirements • NOS already using 6 minute reporting for tide gauges and tsunamis • Tsunami Users around the hemisphere requesting 5 minute assignments • USGS indicates plans to add 10,000 ground well monitoring systems • Reporting hourly at NWS request • Historical Climate Network needs 1000 stations • Approximately 500 already assigned • National Fire Danger Rating Network Mandated Use of GOES DCS • Goal of 15 minute reporting • World Bank Recommends use of GOES DCS for Emergency Warning Data in Latin America (a Quickly Growing Segment) • In 2003 system had 9,000 transmitters, 150 users, 100,000 messages • Current use 30,000 transmitters, 400 users, 600,000 messages • More than 300% increase from 2003 usage • More users, more stations, more frequent observations and more sensors are anticipated in the future based on current growth rate/demand • These factors point to the future need for additional network capacity to sustain a reliable service for DCS users NOAA GOES DCS

5. V.2 Status • Certification Standards completed and published • Certification test sets completed • New filter Defined • Ground System Software changes identified • Version II Test Channel Loaded with New Software • New Channel Structure Defined • One manufacturer certified at V.2 • One user reportedly ready to start testing NOAA GOES DCS

6. Ground System Requirements • Software changes to demodulators required • Short Term Change • New RRC (Root Raised Cosine) filter implemented • Redefine Frame Sync Sequence in software • Implement new firmware on DAMS-NT demodulators • DADDS changes • Short Term Change • New channelization (channel structure) • Expand processing capability • Expand records handling and file handling capability (i.e. more records, more matrices, more files from larger number of channels) • Purchase additional demodulators • Long Term Change • Not needed for Several Years • Can Purchase Incrementally as Needed NOAA GOES DCS

7. How Do We Proceed? • Run Operational Demonstrations on V.2 Test Channels • Successful Demonstration Leads to Loading Software Changes on all Channels • Continue Certifying New Equipment • Work with Manufacturers to assure commercial DRG Systems Version II compatible • Work with users to identify channels in existing system that are eligible for V.2 implementation because DRGS is capable of handling new data stream (or no DRGS in use) • Allow new transmitters to start populating system on existing channels • Once population is sufficient begin new channel alignment as channels become available for transition NOAA GOES DCS

8. Programmatic Discussion Points • When do we stop allowing new V.1 assignments? • When do Manufacturers stop distributing V.1 equipment? • When do we Require All v.1 equipment to be removed from System (or upgraded)? • How do software upgrades to existing systems get distributed? NOAA GOES DCS

9. Transition Approach • Use Existing Channels “as is” • Field V.2 Transmitters onto same channels as V.1 channels • New and old transmitters compatible with NOAA demodulators • (Other DRGS manufacturers?) • Allow Population of V.2 transmitters to grow with no additional changes • When population on 2 adjacent channels approaches x % (60%?) begin clearing channels to allow intermediate channel to be implemented • Expected to be 3 or 4 years from start date NOAA GOES DCS

10. GOES DCS Contact Information • Kay Metcalf • GOES DCS Program Manager • kay.metcalf@noaa.gov • 301-817-4558 • Letecia Reeves • GOES DCS Customer Service Representative • letecia.reeves@noaa.gov • 301-817-4563 • Email • goes.dcs@noaa.gov • URL • http://noaasis.noaa.gov/DCS NOAA GOES DCS