For the JPSS mission, the HRD direct broadcast is a continuous downlink of mission environmental data to users on the ground that are equipped with the resources necessary to capture the
broadcast when the satellite is within view. The objective of the HRD content is to include the full set of science and calibration data from the mission instruments, as well as the spacecraft
attitude and ephemeris data necessary for data product generation, in order to meet the needs of the direct broadcast community.
The data rate is 15 Mbps (7812 Mhz) for SNPP and NOAA-20. However, the data rate for NOAA-21 (JPSS-2/3/4) and beyond will increase to 25 Mbps.
The science data on the HRD includes data from: Cross-track Infrared Sounder (CrIS), Advanced Technology Microwave Sounder (ATMS), Visible Infrared Imaging Radiometer Suite (VIIRS), Ozone Mapping and Profiler Suite (OMPS), Clouds and the Earth's Radiant Energy System (CERES) (S-NPP and NOAA-20 only).
There are 47 HRD users. Many HRD users utilize the Community Satellite Processing Package (CCSPP) Low Earth Orbiting (LEO) software to ingest the HRD science data and create data products (from CrIS, ATMS, and VIIRS).
The JPSS Program posted the Joint Polar Satellite System-2 (JPSS-2) Satellite High-Rate Data (HRD) to Direct Broadcast Stations (DBS) Radio Frequency (RF) Interface Control Document (ICD) on the JPSS Website. The ICD applies to JPSS-3 and JPSS-4 as well https://www.jpss.noaa.gov/technical_documents.html.
An updated JPSS 2/3/4 link budget document is now available for JPSS HRD ground terminal end users.
Direct Broadcast Receive Station -- The antenna tracks the satellite, the signal is down converted and input to the QPSK receiver/demodulator where the signal is demodulated and data streams are created. The field terminal software ingests the data and generates data products. Many HRD users utilize the CSPP software.