Title: NPP High Rate Data HRD Broadcast: Preparing for the Future
1NPP High Rate Data (HRD) BroadcastPreparing for
the Future
- Timothy Trenkle
- Patrick Coronado
- October 6, 2005
2Agenda
- 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
3Agenda
- 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
4NPP 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
5NPP Nadir Deck View
VIIRS
HRD antenna
CrIS
ATMS
OMPS
6NPP 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 1.5 dB
- Effective bit error rate 1x10-8
7NPP HRD Overview Physical Layer
8NPP 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)
9NPP 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)
10Agenda
- 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
12NPP 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
13NPP 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
14NPP 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
15Agenda
- 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