4Background Current Direct Readout Services: Automatic Picture Transmission (APT) ServiceAnalog service operational on POES spacecraftService available through the life of legacy spacecraftLow Resolution Picture Transmission (LRPT)EUMETSAT replaced analog APT with the digital LRPT on Metop-ALRPT on Metop-A interfered with the sounder, turned off in 2007LRPT is not available on Metop-B/CHigh Resolution Picture Transmission (HRPT)Digital service operational on POES spacecraftAdvance High Resolution Picture Transmission (AHRPT)EUMETSAT replaced HRPT with the AHRPT with Metop-AMetop-A AHRPT service limited operation since 2007Metop-B AHRPT is full global operation
5Characteristics APT HRPT AHRPT LRD (TBD) HRD Receiver Center Frequency (MHz)137.5 , , 137.1,1698,1707,1702.51701.3,170717037812Data Rate38 Kbps664 Kbps3.5 – 4.66 Mbps15 MbpsPolarizationRight-hand CircularRight-hand Circular, Left-hand Circular based on transmitter in useBandwidth30-40 KHz3.0 MHz4,5 MHz4.5 MHz300 MHzModulation2.4 KHz AM subcarrier on FM carrierDigital, Split Phase ModulatedQPSKFormatNOAA APT FormatNOAA HRPT FormatCGMS AHRPT Global SpecCCSDS5o elevation and clear skyN/A6 db/K22.70 db/K
6Service AvailabilityAPTHRPTLRPTAHRPTLRDHRDPOESYESNOMetopMeteor MFY-3S-NPPJPSS-1NO*JPSS-2*Development of an LRD service on JPSS-1 was suspended in Currently, JPSS is not planning to implement L-band capabilities on JPSS-2 and beyond and is studying the impacts on users.
7APT Service Service Transition APT service WILL BE available until end-of-life of POES spacecraft ,NOAA’s future polar-orbiting satellites will NOT support an APT or APT-like service,A likely alternative is the Low Resolution PictureTransmission (LRPT) serviceAvailable on Roshydromet Meteor-M/MPseries satellitesUse of the MHz frequency band on future NOAA polar-orbiting satellites has not been considered.
8HRPT Service Equipment 1.1 meter (or larger) parabolic dishAntenna positioner and control hardware including azimuth and elevation rotatorsFeedhorn and quadrature combinerLow noise amplifierWide band receiverDemodulatorBit-synchronization boardPersonal ComputerSoftware for image ingest, processing, and displayCostComplete system: $50K+ (USD)Visit any satellite receiver manufacturerSeeNOAASIS/ml/manulst.html for list of vendorsThe HRPT service will be continuous through the end-of-life of the POES spacecraft.
9Summary of JPSS Direct Readout Plan JPSS Level 1 Requirement document provides the basis for the planned support of the direct readout community with direct broadcast from JPSS-1 and JPSS-2JPSS-1 will provide HRD (High Rate Data) broadcast containing sensor dataJPSS-2 will provide HRD broadcast and the NOAA JPSS Office will finalize decision to not implement LRD (Low Rate Data) broadcast after studying user impacts.The JPSS HRD broadcasts (JPSS-1,JPSS-2) will contain all of the sensor data necessary for the field terminal user community to produce a full set of data records (Mission Support Data will be available by internet)Any potential JPSS-2 LRD broadcast would contain the necessary sensor data for the field terminal user community to produce a prioritized set of data records
10Summary of JPSS Direct Readout Plan (con’t) JPSS will not perform encryption of the direct broadcastJPSS will provide the necessary inputs (for the field terminal user community to produce the data records) on a web portalAlgorithms & Software, Data Processing Framework, Mission Support Data (MSD), Field Terminal Hardware Specifications, Test ProductsUsers will be notified of any updates to these productsSoftware and algorithm updates are JPSS configuration control board (CCB) managedJPSS will provide additional services to the field terminal user communityHRD downlink status (post-pass) & mission status notificationsHelp desk for user support (TBD)
11Summary of JPSS Direct Readout Plan (con’t) The key differences in the mission architecture from S-NPP are in bolded text belowMissionsMission OrbitLaunchPayloadsMission CommunicationsData LatencySuomi NPP824 km, 1330 LTAN, Polar Sun-Synchronous, 16 day Repeat CycleULA - Delta II (Vandenberg)VIIRS, CrIS, ATMS, OMPS-N&L, CERESSMD: X band, 300 Mbps, Svalbard/FairbanksHRD: X band, 15 MbpsT&C: S band, Svalbard/Fairbanks/TDRSS140 minutesJPSS-1824 km, 1330 LTAN, Polar Sun-Synchronous, 16 day Repeat Cycle, Mission Constellation with S-NPPULA - Delta-II (Vandenberg)VIIRS, CrIS, ATMS, OMPS-N, CERESSMD: Ka band, 300 Mbps, Svalbard & McMurdo, Fairbanks, TrollSMD Backup: Ka band, 150 Mbps, TDRSST&C: S band, Svalbard/Fairbanks/Troll, TDRSS80 minutesJPSS-2 (Future)824 km, 1330 LTAN, Polar Sun-Synchronous, 16 day Repeat Cycle, Mission Constellation with S-NPP and JPSS-1TBD (Vandenberg)VIIRS, CrIS, ATMS, OMPS-N, OMPS-L, CERES Follow-on (objective)LRD: L band, 4 Mbps (if implemented)SMD - Stored Mission Data, HRD – High Rate Data, T&C – telemetry and Command,
12High Rate Data (HRD) Service (con’t) Registration of X-band StationsThe X-band range (7.75 – 7.90 GHz) is shared between Meteorological Satellites and Point-to- Point Radio Links on ground.To protect against Potential Interference from Point- to-Point Radio Links it is strongly recommended to register X-band Direct Readout Reception Stations with the national Radio Frequency Authorities;Before selecting a location for a new X-band Direct Readout Reception Station it is advisable to carry out a Radio Frequency Survey to identify any existing sources of interference.
13High Rate Data (HRD) Service EquipmentCostX-band only $250K+ (USD)L-band/X-band $400K+ (USD)Equipment InformationVisit any satellite receiver manufacturerSeeNOAASIS/ml/manulst.html for list of vendorsThe HRD service will be continuous through S-NPP and JPSS-1/2.A HRD service will be available on several future international polar-orbiting constellations. See
14Low Rate Data (LRD) Service EquipmentEquipment ConfigurationSimilar to Metop AHRPT terminalData FormatCGMS Global Specifications for AHRPTCostLRD $100K+ (USD)An L-band service will not be available on S-NPP and JPSS-1.EPS-SG has excluded the transmission a (very) reduced amount of data in L-band in parallel, for cost reduction and performance reasons.The 1695 – 1710 MHz band covering the US states will be shared with commercial broadband services.
15HRPT Transition Transition to HRD It will not be possible to upgrade an existing HRPT station to use the S-NPP/JPSS HRDOld equipment not compatibleRequires a new X-band field terminalOther systems that don’t meet those requirementsReplacement of demodulator and potentially other components;Software upgrades to handle S-NPP/JPSS instrument data and other S-NPP/JPSS specific aspectsStation CostX-band only $250K+ (USD)L-band/X-band $400K+ (USD)System informationVisit any satellite receiver manufacturerSee/manulst.html for a list of vendorsThe meteorological X-band (7.75 – 7.90 GHz) has been selected for EPS-SG direct broadcast..
16HRPT Transition Transition to LRD Equipment Upgrades Data Format Similar to HRPT to Metop AHRPT upgradesData FormatCGMS Global Specification for AHRPTStation CostL-band only $100K+ (USD)L-band/X-band $400K+ (USD)Equipment InformationVisit any satellite receiver manufacturersSeemanulst.html for a list of vendors
17SummaryA summary of the spacecraft services and field terminal changes are listed below:METOP ConstellationLRPT:APT Service replaced the failed LRPT in the AM orbit;LRPT is not available on METOP-B/C;AHRPT: New format requires upgrades to existing HRPT field terminals or purchase new station.POES ConstellationAPT: Frequency change in the – MHz frequency band;HRPT Service remains unchanged;APT/HRPT services are available until POES end-of-life.S-NPP/JPSS ConstellationAPT service will not be available;HRPT will not be available and might be replaced with the LRD broadcast, which would require L-band field terminal upgrades;LRD will not be available on S-NPP or JPSS-1; a final decision on JPSS-2 will be made after studying the impacts of no LRD on users.HRD service requires a new X-band field terminal.
18Summary of Direct Readout Services Satellite/SeriesTime PeriodType of Service (1)Frequency BandNominal Freq Range & Data RateNOAA1983 – 2013+APTVHF137 MHz; 33 KbpsHRPT (3)L-band1698, , or 1707 MHz; 665 KbpsMETOP-A/BpresentAHRPT (3)1701/1707 MHz; 3.5 MbpsLRPT137/139 MHz; 75 KbpsS-NPPpresentHRD (2)X-band7812 MHz; 15 MbpsJPSS-1FF-1A-DCS1705 MHz; 1.5 MbpsJPSS-2LRD (TBD)1703 MHz (TBD); 3.8 Mbps1. All services are Digital, except NOAA APT which is Analog Contains Full Resolution Imagery Data 3. L-band Full Resolution Imagery ends with NOAA-19 circa 2013, but continues with METOP-B. Data rate for METOP-C is uncertain.User impacts of no L-band service on JPSS-2 and beyond are requested.
19Contact InformationMarlin O. Perkinshttps://www.noaasis.noaa.govPaul Seymour