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NPP High Rate Data (HRD) Broadcast: Preparing for the Future

This presentation provides an overview of the NPP High Rate Data (HRD) Broadcast, including the physical, transport, and application layer characteristics. It also covers the pre-launch integration and test activities, as well as preparations for the NPP HRD broadcast.

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NPP High Rate Data (HRD) Broadcast: Preparing for the Future

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  1. NPP High Rate Data (HRD) Broadcast:Preparing for the Future Timothy Trenkle Patrick Coronado October 6, 2005

  2. Agenda • NPP High Rate Data Broadcast (HRD) Overview • Physical Layer Characteristics • Transport Layer Characteristics • Application Layer Characteristics • HRD Pre-launch Integration & Test Activities • Preparing for NPP HRD

  3. Agenda • NPP High Rate Data Broadcast (HRD) Overview • Physical Layer Characteristics • Transport Layer Characteristics • Application Layer Characteristics • HRD Pre-launch Integration & Test Activities • Preparing for NPP HRD

  4. NPP HRD Overview • NPP Satellite provides a continuous, real-time, high rate data (HRD) broadcast containing: • Instrument Science Data • Instrument Engineering Data • Instrument Housekeeping Data • Spacecraft Housekeeping Data • The HRD broadcast is intended for direct readout users to exploit NPP mission data as a continuation of EOS Terra, Aqua, & Aura mission data and in preparation for NPOESS • The HRD broadcast interface is described in three layers • Physical • Transport • Application • Investment in direct readout station technology was a driving factor in the development of the NPP HRD broadcast characteristics • Physical and transport layers are similar to EOS and NPOESS • NPP HRD is unencrypted and free to access

  5. NPP Nadir Deck View VIIRS HRD antenna CrIS ATMS OMPS

  6. NPP HRD Overview – Physical Layer • The physical layer describes the RF characteristics of the HRD broadcast and is documented in the NPP Spacecraft HRD Interface Control Document (ICD) to the Direct Broadcast Stations (GSFC 429-03-02-24, May 10, 2004) • Frequency: 7812.0 MHz +/- 0.03 MHz (X-Band) • Data Rate: 15 Mbps • Format / Encoding: NRZ-M / Convolutional • Modulation: QPSK (1:1 power ratio) • Antenna: Earth-shaped omni • Polarization: Right hand circular • Margin: > 1.5 dB • Effective bit error rate: 1x10^-8

  7. NPP HRD Overview – Physical Layer

  8. NPP HRD Overview – Transport Layer • The transport layer describes the transfer protocol characteristics of the HRD broadcast and is documented in the NPP X-Band Data Format ICD (GSFC 429-04-02-28, August 23, 2004) • Service Protocol: Consultative Committee for Space Data Systems (CCSDS) Grade 2 telemetry service • Error detection and correction: Reed-Solomon (255, 223, Interleave depth = 4)

  9. NPP HRD Overview – Application Layer • The application layer describes the characteristics of each mission data packet type contained in the HRD broadcast and is documented in the NPP Mission Data Format Control Book (GSFC 429-05-02-42, being baselined)

  10. Agenda • NPP High Rate Data Broadcast (HRD) Overview • Physical Layer Characteristics • Transport Layer Characteristics • Application Layer Characteristics • HRD Pre-launch Integration & Test Activities • Preparing for NPP HRD

  11. SI&T Methodology Overview (cont.) LAUNCH System Hierarchy NPP System - Segments - Elements - Components Mission Readiness System I&T On-Orbit Verification Mission Readiness Verification • Coordinated by • Govt/Ops • On-orbit verification • - Satellite activation • (~90 days) • - Post-activation • verification Space/Ground System Verification • Coordinated by • Govt/Ops • Integrated system • verification • - Operations Readiness • (training, procedures, • simulations) • - Mission Readiness • (Operator certification, • System I&T activities) • - Mission Certification • (Ops Readiness Test) • - External I/F, end-to-end, • performance Segment Verification Element Verification • Coordinated by • Govt • Integrated • segments • verification • System • performance & • thread testing • Verify I/Fs • between segments • (inter-segment) • NPP Compatibility • Test (NCTs) • Conducted by • segment supplier • Integrated element • verification • Verify I/Fs between • elements • (intra-segment) • Conducted by • supplier • Integrated • component • verification • Govt acceptance • test prior to • delivery (opt) PRE-LAUNCH ON-ORBIT

  12. NPP System Level Test Categories • Functional Thread Tests (FTTs) • These tests have their origins in the NPP Concept of Operations and may serve as prerequisites to NCTs or may be included in an NCT • Interface Confidence Tests (ICTs) • Interface Confidence Tests cross segments, developers, and organizations and focus on functionality, confirming the logical interface and data flows, including the formats in an operational configuration • NPP Compatibility Tests (NCTs) • NCTs are tests defined to exercise the flight and ground interactions. Each NCT is comprised of functional thread and interface tests that provide a continuing higher degree of confidence leading up to operational readiness

  13. EDU D/I BB D/I EDU D/I EDU D/I EDU EDU EDU FM FM FM Integ Integ Integ Integ Integ Integ BB FM Integ Integ NPP Launch NPP System Integration Flow ATMS Space Segment Integration CrIS OMPS VIIRS Spacecraft EIT2 & Fixes 1394 FPGA Retro TVAC Ship & L Satellite NCT 2A NCT 2B NCT 3 ORT NCT 2C NCT 4 System Tests 1.3 FAT 1.4 SAT D SAT Sustainment C3S 1.3 RFR 1.3 Qual 1.4 FAT NESDIS SAT Sustainment IDPS AFWA SAT 4.0 4.2 4.1 ADS/CLASS SD3 I&T PEATE Elements SDS SAT SDS

  14. NPP Compatibility Tests • NCTs (Flight/Ground Compatibility) • NCT1 - Spacecraft prior to satellite I&T start (December 2004) • Command database checkout and simple command and telemetry check • NCT2A – ATMS EDU and OMPS Brass Board integrated with Spacecraft (August 2005) • All command and telemetry rates verified, SSR exercised • NCT2B – ATMS EDU and CrIS EDU integrated with Spacecraft (January 2006) • Selected command and telemetry rates, cal table load exercised • NCT2C – ATMS FM, CrIS FM, and VIIRS EDU integrated with Spacecraft (July 2006) • Execute partial mission data handling propagating data through ground system • NCT3 – all 4 flight sensors integrated with Spacecraft (August 2007) • Execute nominal mission data handling propagating data through ground system • NCT4 – all 4 flight sensors integrated with Spacecraft (January 2008) • Execute end-to-end mission data handling throughout the entire flight / ground system with operations staff in place BOLD Text indicates use/participation of HRD

  15. Agenda • NPP High Rate Data Broadcast (HRD) Overview • Physical Layer Characteristics • Transport Layer Characteristics • Application Layer Characteristics • HRD Pre-launch Integration & Test Activities • Preparing for NPP HRD

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