The GOES Rebroadcast (GRB)
The GOES-R series GOES Rebroadcast (GRB) provides the primary relay of full resolution, calibrated, near-real-time direct broadcast Level 1b data from ABI and the space environment and solar instruments and Level 2 data from the Geostationary Lightning Mapper (GLM). The GOES-R series ground system receives the raw instrument data from the GOES-16 satellite and processes it to create Level 1b data products and Level 2+ GLM products that are uplinked to the GOES-16 satellite and then broadcast to earth terminals in the satellite’s footprint. As was the case with the previous generation GOES system’s direct broadcast service, the GOES VARiable (GVAR), the satellite that senses the data, receives and downlinks the processed data products. The GRB is a significant increase in capability from the GVAR service.
The GRB uses two digital streams, each at 15.5 Mbps, compared to the GVAR standard of a single 2.11 Mbps stream. Dual polarization facilitates the 31 Mbps data rate within a frequency bandwidth of 9.8 or 10.9 MHz per polarization, using a standard downlink modulation at 1686.6 MHz (L-band). The GRB service provides a full disk image in either five or fifteen minutes, depending on the mode, compared to GVAR’s thirty minutes. Additional information is available in the Product Users Guide Volume 4 and technical information regarding the data downlink can be found in the Downlink Specifications.
The GRB-processed instrument data is packetized with the Consultative Committee for Space Data Systems (CCSDS) standard 133.0-B-l and compressed using a lossless data compression algorithm to fit the data in the allocated bandwidth. Data blocking is used and header metadata are included to minimize the risk of data loss due to link errors and to enable the user to verify data integrity.
The content distributed by GRB will be the full set of level 1b products, including data products from all of the Advanced Baseline Imager (ABI) bands, Space Environment In-Situ Suite (SEISS), Solar Ultraviolet Imager (SUVI), Extreme Ultraviolet and X-ray Irradiance Sensors (EXIS), and Magnetometer (Mag) and Level 2+ GLM products.
To receive the data, users can purchase the necessary equipment (antenna, receiver, computer, and software) from commercial companies for unlimited access to the GOES-16 GRB. There is no fee or license requirement required by NOAA to receive the data. GOES users must upgrade or acquire new antenna and receiver hardware, and acquire processing systems in order to receive the higher volume of GOES-R series data through the GRB.
The transition from GVAR to GRB continues to evolve and more information will be communicated through meetings and conferences such as the NOAA Satellite Conference as well as on the GOES-R series website. GVAR and GRB users should register on the DCS Administration and Data Distribution System (DADDS). Use the link that says "Register for Direct Readout and Services Notifications“.
The NESDIS point of contact is Mr. James McNitt, Direct Readout Program Manager, Direct Services Branch, Satellite Products and Services Division, Office of Satellite and Product Operation. Email: firstname.lastname@example.org.