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

1
NPP High Rate Data (HRD) BroadcastPreparing 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
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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 (11 power ratio)
• Antenna Earth-shaped omni
• Polarization Right hand circular
• Margin gt 1.5 dB
• Effective bit error rate 1x10-8

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NPP HRD Overview Physical Layer
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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)

VCID Virtual Channel Content Description
0 Satellite Housekeeping Data Satellite HSK data common to both SMD and HRD
1 ATMS RDR Science/Cal/Eng ATMS mission data common to both SMD and HRD
4 ATMS RDR Science/Cal/Eng ATMS mission data specific to HRD
6 CrIS Science/Cal/Eng CrIS mission data common to both SMD and HRD
9 CrIS Science/Cal/Eng CrIS mission data specific to HRD
11 OMPS Science/Cal/Eng OMPS mission data common to both SMD and HRD
14 OMPS Science/Cal/Eng OMPS mission data specific to HRD
16 VIIRS Science/Cal/Eng VIIRS mission data common to both SMD and HRD
19 VIIRS Science/Cal/Eng VIIRS mission data specific to HRD
63 Fill Data Fill VCDU to maintain 15-Mbps HRD rate
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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)

Packet APID Range Packet APID Range Packet
Decimal Hex Source
0 52 0 34 S/C
512 - 531 200 - 213 ATMS
544 - 566 220 - 236 OMPS
768 - 856 300 - 358 VIIRS
1280 - 1402 500 - 57A CrIS
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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
SIT Methodology Overview (cont.)

LAUNCH
System Hierarchy NPP System - Segments -
Elements - Components
Mission Readiness
System IT
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 IT 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
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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

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NPP System Integration Flow
ATMS
Space Segment Integration
CrIS
OMPS
VIIRS
Spacecraft
EIT2 Fixes
1394
Ship L
TVAC
FPGA Retro
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
4.1
4.2
ADS/CLASS
SD3 IT
SDS SAT
PEATE Elements
SDS
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NPP Compatibility Tests

• NCTs (Flight/Ground Compatibility)
• NCT1 - Spacecraft prior to satellite IT 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
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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