4.7.1 Space Based Relay (CCR 1803)
4.7.1.1 Auxiliary Communications (CCR 1803)
The auxiliary communications services are not directly coupled to the GOES-R system with the
exception of the GRB. The GRB was covered in the above section pertaining to Internal Services. The other auxiliary communications services are the DCS, the HRIT/EMWIN and the SARSAT. These communications services are “bent pipe” to the GOES-R satellite and are received, amplified and re- transmitted to external users and is performed independently of the GOES-R by dedicated transponders located on each of the GOES-R satellites. Operations of these services are also performed independent of the GOES-R system. The data distribution of the auxiliary communication services is as shown in Figure 7 and described below. (CCR 1803)
1 Ground Segment latency is measured from the GS acquisition of raw instrument measurements to posting to the GOES-R
User Portal server. Latency associated with transfer of data from the server to the user over public telecommunications networks will not be included within the product latency requirement. Latency is illustrated in later sections of this document. (CCR 1803)
Figure 7 - GOES-R Auxiliary Communications Data Distribution System (CCR 1803, CCR2680A)
4.7.1.2 Data Collection System (DCS) (CCR 1803)
The GOES Data Collection System is a relay system used to collect information from a large number of Earth-based platforms that transmit in-situ environmental sensor data on predefined frequencies and schedules, in response to thresholds in sensed conditions, or in response to interrogation signals. The management of DCS ground system resources is outside the responsibility of GOES-R. (CCR 1803) There are two types of DCS signals, DC Platform Commands (DCPC) and DC Platform Reports
(DCPR. The DCPCs are generated outside the GOES-R system, routed to the WCDAS where the signal is modulated onto the GOES-R S-band transmitter and uplinked to the satellite. The DCS transponder transmits the commands to the DCS platforms. DCPRs are transmitted by the DCS platforms up to the transponder on the GOES-R, transmitted to and received at the WCDAS and routed back to the DCS for processing. (CCR 1803)
4.7.1.3 HRIT/EMWIN (CCR 1374, CCR 1803)
The Emergency Managers Weather Information Network (EMWIN) is a direct service that provides users with weather forecasts, warnings, graphics, and other information directly from the NWS in near real time. The NWS creates the EMWIN and routes it to the NSOF. The Office of Satellite and Product Operations (OSPO) Domain 4 at NSOF creates the High Rate Information Transmission (HRIT) and combines it with the EMWIN data. The combined signal is routed to the Domain 5 at the WCDAS, which routes it to the GOES-R transmitter for uplink to the GOES-R. The GOES-R HRIT/EMWIN
transponder receives the signal, amplifies and transmits the signal where it is received by HRIT/EMWIN independent user terminals. (CCR 1803)
4.7.1.4 SARSAT (CCR 1803)
The Search And Rescue Satellite Aided Tracking (SARSAT) transponder relays emergency beacon signals from marine, aircraft, or individuals in distress. The GOES-R satellite receives the uplink distress beacon, amplifies and transmits it down to and received by the ground support Geostationary Earth Orbit Local User Terminals (GEOLUTs) in the Cospas-SARSAT system. The GEOLUTs in turn dispatch and manage the rescue effort to that local area. The SARSAT service requires only signal monitoring by the GOES-R ground system. This is truly a “bent pipe” service to the GEOS-R system. (CCR 1803)
4.7.2 Broadband Relay (CCR 1803)
4.7.2.1 GOES-R Access Subsystem (CCR 1374)
The Environmental Satellite Processing Center (ESPC) will be a primary user of GOES-R data and will reprocess and distribute additional derived products to its user community. ESPC will receive GOES-R products from the GOES-R User Access Point (CCR 1803) for GAS to distribute by PDA to CLASS to archive. CLASS will make archived GOES-R data available to external users. (CCR2680A)
4.7.2.2 National Weather Service
The National Weather Service (NWS) is the primary operational user of GOES-R data. NWS elements will receive selected L1b and L2+ data products directly from the GOES-R AWIPS distribution server and/or GRB. These elements include the National Centers for Environmental Predictions (NCEPs), and NWS Telecommunications Gateway (NWSTG). These NWS systems and organizations may provide post-reception processing and distribution their respective users. The NWS will also supply ancillary data via OSPO to GOES-R for the generation of some L2+ products. (CCR 1803, CCR2680A) The NWS Space Weather Prediction Center (SWPC) is the primary operational user of the space
environment and solar imaging instrument suites. Although processing and distribution of SUVI, EXIS, SEISS, and MAG L1b data will be performed within the GOES-R PG and PD elements, SWPC will evaluate the quality of space environment and solar products, and with tasking and scheduling of the payloads where applicable. The primary method of delivery of space weather data to the SWPC is via GRB. It is possible that selected SEISS and MAG data may be included in the spacecraft narrow-band telemetry link to facilitate continued space environmental data collection during the on-orbit storage mode. SWPC will produce the L2+ data products as required. (CCR 1803)
4.7.2.3 CLASS
CLASS will supply permanent archive and retrospective access services for GOES-R data and
supporting information as part of its mission as the single data repository for all NOAA environmental data. CLASS will receive GOES-R data from ESPDS PDA (per GAS requirements) at ESPC. CLASS is the IT infrastructure supporting the National Climactic Data Center (NCDC) in Asheville, NC and the National Geophysical Data Center (NGDC) in Boulder, CO. CLASS operates from these two facilities. The facilities provide redundancy with similar hardware and identical software and are capable of assuming the overall CLASS load at any given time. During normal operations, both facilities are operational and share the processing and distribution load.
The content of the ABI, GLM, SEISS, SUVI, and EXIS data will be routed by PD to GAS (PDA) and then to CLASS for permanent archive and will be determined by the NOAA Data Stewardship Council. L2+ ABI and GLM data products will be distributed by GAS (PDA) to CLASS for permanent archive. Access to GOES-R data stored in CLASS by retrospective users will be via the CLASS interface. (CCR 1803, CCR2680A)