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

Timothy TrenklePatrick Coronado

October 6, 2005

MSO - 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

MSO - 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

MSO - 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

MSO - 5

NPP Nadir Deck View

HRD antenna

VIIRS

CrIS

ATMS

OMPS

MSO - 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

MSO - 7

NPP HRD Overview – Physical Layer

Commandand DataProcessor

Down

ConverterReceiver

QPSK

Demodulator

BitSynch

Derandomize

15Msps

High Rate Bit SynchronizerUnit

EarthCoverage

X-Band(RHCP)

7812MHz

3 MeterReceiveAntenna

Direct DownlinkUser Ground

Terminal

Spacecraft

RF Out

30 MspsQPSK

Modulator

Frequency Synthesizer

SSPA15 MHzClock

I channel

Q channel

Pre Amp (Harmonic Filter)

X-Band Transmitter

NRZ-Lto

NRZ-M

ConvoCode

G1

G2CADU

Mission Data(Science & TLM)

LVDSDifferentialInterface

LVDSData __

I

Q

BitSynch

ViterbiNRZ-M

toNRZ-L

OutputCCSDSPackets

15Msps

15Msps

15Msps

15Mbps

15Mbps 15

Msps

15Msps

MSO - 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)

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

MSO - 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)

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

MSO - 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

MSO - 11

SI&T Methodology Overview (cont.)

ElementVerification

SegmentVerification

Space/GroundSystem

Verification

On-OrbitVerification

PRE-LAUNCH

• Conducted by segment supplier • Integrated element verification• Verify I/Fs between elements (intra-segment)

• Coordinated by Govt • Integrated segments verification• System performance & thread testing• Verify I/Fs between segments (inter-segment)• NPP Compatibility Test (NCTs)

• Conducted by supplier • Integrated component verification• Govt acceptance test prior to delivery (opt)

• Coordinated by Govt/Ops• On-orbit verification - Satellite activation (~90 days) - Post-activation verification

LAUNCH

ON-ORBIT

Mission ReadinessVerification

• 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

System HierarchyNPP System - Segments - Elements - Components

System I&T

Mission Readiness

MSO - 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

MSO - 13

NPP System Integration Flow

EDU D/I

NCT 2A NCT 2B NCT 3 NCT 4 ORT

System Tests

ATMS

CrIS

OMPS

VIIRS

1394

Satellite

C3S

IDPS

ADS/CLASS

EDU

Integ

FM

Integ

EDU

Integ

FM

Integ

FM

Integ

BB

Integ

FM

Integ

EDU

Integ

Ship & L

NPPLaunch

TVAC

EDU D/I

EDU D/I

1.3 FAT 1.4 SAT D SAT

1.3 Qual1.3 RFR

1.4 FAT NESDIS SAT

AFWA SAT

Sustainment

Sustainment

SDSSD3 I&T SDS SATPEATE Elements

4.0 4.14.2

Spacecraft

BB D/I

FPGA Retro

EIT2 & Fixes

Space Segment Integration

NCT 2C

MSO - 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

MSO - 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