Section 19.0 Combined Ground System

Section 19.0Combined Ground System

Irene BibykGround System Manager

ST5 PDR June 19-20, 2001

GSFC5Space Technology

“Tomorrow’s Technology Today”

ST5 PDR June 19-20, 2001

GSFC

19-2

•Introduction•Mission Operation Center Integration•Ground Data System - ASIST•Ground Station/Network

– Flight Dynamics

•ST5 Technology Demonstration - SatTrack•Risk Mitigation

Agenda

Introduction

ST5 PDR June 19-20, 2001



19-3

ST5 PDR June 19-20, 2001

GSFC

19-4

Combined Ground System & Operations

Laun

ch12

/15/

03

9/03

6/03

3/03

12/0

2

9/02

6/02

3/02

12/0

1

9/01

6/01

PDR

CD

R

MO

R

FOR

MR

R

Net

wor

k Te

st-1

Net

wor

k Te

st-2

Net

wor

k Te

st-3

Com

pat.

Test

-1

Com

pat.

Test

-2

Com

pat.

Test

-30

Com

pat.

Test

-4

Msn

Rea

dine

ss T

est-1

Msn

Rea

dine

ss T

est-2

Msn

Rea

dine

ss T

est-3

Msn

Rea

dine

ss T

est-4

Msn

Rea

dine

ss T

eST5

Msn

Rea

dine

ss T

est-6

Msn

Rea

dine

ss T

est-7

& 8

Msn

Rea

dine

ss T

est-9

& 1

0

Tech

. Aliv

enes

s Te

st-1

Tech

. Aliv

enes

s Te

st-2

Tech

. Aliv

enes

s Te

st-3

Laun

ch D

ress

Reh

ears

al

SIM

GR

OU

P 1

Rev

iew

OC

D

Fina

l OC

D

Fina

l DM

R

Dra

ft FO

P

Dra

ft FP

D

Fina

l FPD

SIM

GR

OU

P 2

SIM

GR

OU

P 3

Fin

FOP

ST5 PDR June 19-20, 2001

GSFC

19-5

Documentation• Operations Concept Document - Preliminary complete

– Flight Operations Plan

– Flight Procedures Document

– Launch & Early Orbit Handbook

• Detailed Mission Requirements Document - Preliminary complete– ASIST ICD - Heritage from MAP & EO-1

– FD ICD

• SatTrack Requirements Document - Complete– SatTrack Statement of Work - Complete

– SatTrack ICD

• Ground Station Requirements Document - Complete– Ground Station Statement of Work - Preliminary complete

– Ground Station RF ICD

ST5 PDR June 19-20, 2001

GSFC

19-6

Major MilestonesFY01 FY02 FY03

Date Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4Milestone Ap Ma Jun Jul Au Se Oc No De Ja Fe Ma Ap Ma Jun Jul Au Se Oc No De Ja Fe Ma Ap Ma Jun Jul Au Se

ASIST / FEDSW/Ss FSW HDS C&DH FlatSat s/c1 s/c2&3FEDS C&DH FSWFlatSat s/c1 s/c2&3

MOC Int & MRTMRT1 (FlatSat Tests)SIM#1First Test w/MOCMRT2 (S/C 1 Test)SIM#2 (S/C 1 Env)GroundSeg TestsMRT3 (Constellation Test)SIM#3 (S/C 2 & 3 Env)MRR (Jul'03)

Ground StationSelection (Jul'01)Peer Review -DesignGnd RF ICDAntenna Upgrades & Compat H/W DevUpgrade CertificationRF Compat TestGround Network MRT

SatTrackContract AwardS/W Del#1 (OD Tool)SatTrack (w/MRT1)S/W Del#2 (Auto Sched Tool)SatTrack MRT

Mission Operation Center Integration

ST5 PDR June 19-20, 2001



19-7

ST5 PDR June 19-20, 2001

GSFC

19-8

Requirements/Approach• The GDS shall provide interface support for the Autonomous

Network Scheduling and Orbit Determination S/W (MRD 30401000)– ASIST shall interface with SatTrack via a TCP/IP socket for ascii file transfer

• The mission shall be capable of supporting “lights out” operations (MRD 30500000)– Standard GSFC automation approach with ASIST and SERS, except for the

addition of the ST5 tech demo of SatTrack

• Approach– In-house mission operations center will be co-located with one of the existing

MOCs in Bldg. 14, such as MAP, TRACE or EO-1• Heritage system in an existing facility will reduce risk and save money by taking advantage

of security perimeter, redundant utilities and communications. (Note: FOT and systems are not planned to be shared)

– FOT training and control center checkout to occur during I&T

ST5 PDR June 19-20, 2001

GSFC

19-9

Data Flow Diagram

ST5 Mission Operations Center

SatTrack/Tech Demo- Automated

Ground StationScheduling and

- OrbitDetermination

RTADS (L&EO)-Near RealTime AttitudeDetermination for Launch

& Early Orbit - Maneuver Planning JPL CCNT

Ground System

ST5 Experimenter Operations Center

ASIST- Telemetry Monitoring

- Command Load & Uplink- Data Storage

- Limit Checking- Events Monitor

- Automated STOL Proc Exec

NASAIntegrated Services Network

Commands/VC#

RealTime System

NISN

MMFD/Nom Ops-Bldg 28

- Orbit Predict

Magnetometer(ASIST Assoc)

Data

GroundStation

- Sun sensor- Magnetometer

- Ranging- Data transfer- Science event

Real time Data/VC#

Recorder Data/VC# - Predicted Orbit

Orbit

- Uplink/Downlink on X-Band- Two way Doppler Tracking

EARTH

- Exp Planning- Instrument Eval- Experiment Data Processing

SkytelPagingService

GPS

Offline System

Tracking

OrbitPred

Tracking

- Attitude

Telemetry

Commands

RTADS (Nominal)

GSFC-site

Attitude

VMOC DataServer

PAGE FOT

Mission PlanningSystem Planning Aids

Auto-STOL Proc/Status

ST5 PDR June 19-20, 2001

GSFC

19-10

Mission Readiness Test Flow

FlatSat Test Series- Basic Timing Test-MOC Set-up Test

- Tlm & Cmd Processing Test- Tech Data Validation Test

-Cmd Management Test

Aug’02 - Oct’02

Ground Segment Test Serieswith FlatSat and/or S/C No.1

- TT&C Ground Station TestsMission Planning & Scheduling Tests

- SatTrack Lights-out TestComprehensive Ground Station Test

- Mission Science Data Processing Test

Nov’02 - Mar’03

S/C No.1Integration & Test

S/C No.1Enviromental Tests

S/C No.1 Test Series- Basic Timing Test No.2 Tech Aliveness Test No.2

- PTP Validation Test- RF Compatibility Test(Pre-TV)- Basic Timing Test No.2 (in TV)

- RF Compatibility Test (Post-TV)

S/C No.2 & No.3Integration & Test

Jan’03 - Apr’03

Constellation Test Series- RF Compatibility Tests (No.2&No.3 - Pre-TV)

- Technology Aliveness Test No.3- Comprehensive Timing Test No.3

- FINAL End - to - End Test (Cmd & Tlm Test)

May’03 - Jul’03

Three Series of Tests (FlatSat, S/C No.1, Constellation)

Simulation No.1(FlatSat)

S/C No.2 & No.3Environmental Tests

May’02 - Oct’02 Nov’02 - Mar’03

Simulation No.2S/C 1 (Env)

Apr’03 - Jun’03

Simulation No.3S/C 2 & 3 (Env)

Apr’03 - Jun’03

Aug’02 Feb’03 Jul’03

ST5 PDR June 19-20, 2001

GSFC

19-11

Status•High level integrated schedule with I&T

developed•H/W and S/W purchases (ASIST/FEDS) •I&T, Ops, subsystem staffing for I&T, Mission

Readiness Tests and Mission Operations in work

Ground Data System-ASIST

ST5 PDR June 19-20, 2001



19-12

ST5 PDR June 19-20, 2001

GSFC

19-13

• The Mission shall validate the ability to take measurements and to handle the downlink and ground data processing of multiple data streams from multiple S/C (MRD 20300000)– New ASIST capability where the FEDS will contain multiple ingest cards and

data streams will be sorted by S/C ID– Existing data interface protocols will be used with SERS, FD, MPSS, and new

technologies (SatTrack and CCNT)

• The facility shall have the ability to connect with the vehicle(s) at both baseband (i.e. Hard-Line) and RF (MRD10303080 - supporting)– Heritage connection where the FEDS shall have the ability to connect to the

vehicles during I&T

• CCSDS recommendations shall apply to space/ground com channels and to basic space/ground services provided to instruments by the S/C (MRD 10303050)– CCSDS applications are heritage systems

Requirements

ST5 PDR June 19-20, 2001

GSFC

19-14

• Time correlation between the S/C clock & Coordinated Universal Time (UTC) shall be known to within 5 msec

(3 sigma) (MRD 20500000 - supporting)– Heritage from EO-1 for Return Data Delay (RDD) time correlation– Ground station will append the time each VC0 CADU was received at the

ground station to the internet protocol data unit (IPDU) header and the FEDS will read both S/C time and ground station time tag to determine S/C to UTC time difference

• Approach: Heritage systems from IMAGE, EO-1 and MAP; ST5 FSW re-using MAP FSW; ST5 C&DH re-using MAP processor

Requirements/Approach

ST5 PDR June 19-20, 2001

GSFC

19-15

S/C 1

S/C 2

S/C 3

S/C Data System

X-BandXponder

Data CLK

C & DH HDS

FEDS

GroundStationGnd Stat I/F

TCPIP

PCI Serial I/O

ACB2

Bit Sync

S-BandRcvr

X- to S- DownConverter

I & T GSE

TSS2000Modulator

BPSK

S- to X- UpConverter

I/F BoxDiplexer RF

Cmd ProcessorFrame

Sync (S/W)(CRC, RS)

R/TBuffer(S/W)

PacketDistribution

System

Time CodeCard

DigitalHistory

DataStorage (DHDS)

ASISTPrimary

Workstation

ASISTAssociate

Workstations S/C TestConnectio

n

I & T Only

Ops Only

I&T and Operations Command & Telemetry Flows

NISN

ASISTScience

WorkstationsCCNT

Workstations

ST5 PDR June 19-20, 2001

GSFC

19-16

•ASIST Workstation deliveries to FSW and GNC (for HDS) completed

•FEDS (Front End Data System) in development for C&DH– Timing card will be included

•FEDS and ASIST deliveries to FlatSat and FSW in first quarter FY02

•Testing multiple ingest cards in FEDS•ASIST Build 9.1 (some updates with multiple

data streams)•Working data management and verification of

crosslink data from CCNT

Status

Ground Station/Network

ST5 PDR June 19-20, 2001



19-17

ST5 PDR June 19-20, 2001

GSFC

19-18

• The ground segment shall provide one 20-minute contact window per S/C every orbit below 5 Re altitude (MRD 10801000)– For nominal operations, ground stations being required to provide

30 minutes of visibility for simultaneous data command, telemetry, and tracking, • Extra time added for link acquisition and margin

– Stations must be compatible with new ST5 technology transponder; sweep, acquire and lock as listed in the ground station requirements specification

– Data recovery goal for ground station is 90% (space to ground), in support of technology and science validation requirements minimum of 70% of on-orbit generated data constellation in total shall be received by the ground (MRD 10800000 - supporting)

Requirements

ST5 PDR June 19-20, 2001

GSFC

19-19

• The ground station network shall provide X-band command uplink capability, in at least 1 station (MRD 10104041)– 2 stations are highly desirable for more coverage with orbit

uncertainties and as a back-up station– Nominal operations may be capable to work with a less-than-

once-per-orbit uplink command window (i.e., every 2nd/3rd pass)• Time correlation (update S/C clock), tracking and operational

scenarios will determine the uplink contact frequency

• The system uplink data rate shall be 1 Kbps. (MRD 10303061 - supporting)– New X-band equipment required, but data rate is not

challenging

Requirements

ST5 PDR June 19-20, 2001

GSFC

19-20

Requirements• The S/C shall have 2, ground selectable, downlink data rates:

1 Kbps (2 Ksps) and 100 Kbps (200 Ksps) (MRD 10303063 - supporting)– The S/C shall be capable of supporting the high rate downlink to a

communications range of 5 Re. (MRD 10303065 - supporting)

– The S/C shall be able to support the low data rate downlink at any point in the orbit (MRD 10303066 - supporting)

• The ground station shall be capable of performing Doppler tracking in support of orbit determination (MRD 10301020)– The system radiometric Doppler tracking accuracy shall be sufficient to support

ground antenna pointing at distances of 2 to 5 Re. (MRD 10301011 - supporting)

• Ground station oscillator must be stable enough to support

– The system shall be capable of supporting the mission using only one-way Doppler measurements from the S/C (10301012 - supporting)

• Transponder oscillator will determine performance

ST5 PDR June 19-20, 2001

GSFC

19-21

Apogee @ ~5:15

Perigee @~10:31

2 Re @ ~9:32

2 Re@ ~0:58

5 Re@ ~3:22

5 Re @ ~7:08

Perigee @~0:00

2hrs&24mins144mins

Nominal Operations Total contact time required per orbit: ~90 mins (1.5 hrs) - Range limited between 2 - 5 Re for simultaneous:- Recorder downlink at 100 kbps (range limiting factor)- Real-time downlink at 1 kbps- Command uplink at 1 kbps- Two-way Doppler tracking

Notes (for s/c illustration):All attitude and orientations not to scaleS/C and antenna beam not to scaleS/C distances not to scale

Orbit Scenario

L&EO: No time specs, need schedule flexibilityAny Point in Orbit for simultaneous:- Real-time downlink at 1 kbps- Command uplink at 1 kbps- Two-way Doppler tracking

ST5 PDR June 19-20, 2001

GSFC

19-22

Orbit Analysis - PreliminaryAssumptions: Apogee at ascending node, perigee at descending node, Epoch December, Antenna spinning 86-40ºoff boresight, inclination of 25 º, eclipse not included

L&EO Req: Flexibility to ensure H&S C/O---->

NominalOperationsReq: 180 mins/day ---->

ST-5 Coverage Summary Table 14 Day Pass Stats (mins)

Maximum Minimum Average Min/Day Maximum Minimum Average Min/DayKiruna 584.6 111.2 293.4 398.2 0.0 0.0 0.0 0.0Fairbanks 608.7 76.6 289.5 413.5 0.0 0.0 0.0 0.0Horsham 452.6 22.1 172.6 308.1 0.0 0.0 0.0 0.0Madrid 360.8 0.1 145.8 302.0 0.0 0.0 0.0 0.0Goldstone 343.1 10.6 133.5 276.6 0.0 0.0 0.0 0.0South Florida 326.7 0.8 129.7 222.4 57.2 31.0 41.3 8.8Hawaii 300.8 0.6 104.4 164.0 174.0 26.3 105.2 52.6Canberra 0.0 0.0 0.0 0.0 525.4 0.8 203.9 407.7

Maximum Minimum Average Min/Day Maximum Minimum Average Min/DayKiruna 132.7 81.3 113.9 122.0 0.0 0.0 0.0 0.0Fairbanks 135.3 3.6 97.3 118.1 0.0 0.0 0.0 0.0Horsham 139.0 2.6 55.6 91.3 0.0 0.0 0.0 0.0Madrid 124.0 5.6 58.0 107.7 0.0 0.0 0.0 0.0Goldstone 121.0 5.4 59.9 89.8 0.0 0.0 0.0 0.0South Florida 131.0 3.6 72.2 77.3 55.1 26.6 36.3 7.8Hawaii 141.7 0.5 94.4 87.7 127.5 26.3 84.7 42.3Canberra 0.0 0.0 0.0 0.0 148.3 3.9 68.4 102.6

Antenna Pointing Ecliptic North Antenna Pointing Ecliptic SouthUnconstrained Range from Station

Antenna Pointing Ecliptic North Antenna Pointing Ecliptic South

Constrained 1-5 Re Range from Station

ST5 PDR June 19-20, 2001

GSFC

19-23

Requirements• Ground station-received AGC levels in addition to auto-

tracking antenna angles shall be provided (MRD 10104024)– Ground stations to provide data each pass in support of transponder

performance validation• Information is currently available today - no changes

• Time correlation between the S/C clock and UTC shall be known to within 5 msec (3 sigma) (MRD 20500000 - supporting)– Telemetry received by the ground network shall be time tagged to an

accuracy of at least 1 msec (3 sigma) of UTC (20504000)• With today’s GPS H/W at the ground stations, this can be accomplished easily

ST5 PDR June 19-20, 2001

GSFC

19-24

•Modify an existing station network to support ST5– Many existing stations have S-band transmitter with an X-band

receiver and the receiver is compatible with ST5 transponder

– DSN only station network with X-band transmitter and receiver (not planning to use DSN for ST5 Operations)

Approach

ST5 PDR June 19-20, 2001

GSFC

19-25

•Requirements document (ST5-495-052) completed•SOW (ST5-495-064) and Task Order in process•Preliminary visibility analysis completed•Major Milestones

– Ground station (commercial or government) on board - August 2001

– Ground Station ICD - December 2001

– RF Compatibility tests - November 2002

– MRT- Operational Readiness - May 2003

Status

Flight Dynamics

ST5 PDR June 19-20, 2001



19-26

ST5 PDR June 19-20, 2001

GSFC

19-27

• Pre-launch-develop and verify tracking method – Pre-launch support for 2-way Doppler tracking requirement definition and

verification

– Post launch, MMFD located in Bldg 28 (GSFC) is prime for OD support at launch and during nominal mission operations

• Orbit determination within 10 km for ground antenna pointing– An 11-m ground antenna at a distance of 2 Re from S/C, orbit position

knowledge of 24Km (3 sigma) or a deviation of no more than 8Km (1 sigma)

• Maneuver support during launch and early orbit– Attitude and orbit determination

• Attitude and orbit product generation– Products required throughout operations

Approach

Autonomous Network Scheduling and Orbit Determination S/W Requirements

ST5 PDR June 19-20, 2001



19-28

ST5 PDR June 19-20, 2001

GSFC

19-29

• Technology Provider - Bester Tracking Systems, Inc.• Technology Description

– Future Ground Operations Automation for Constellations Enabling Technology• S/W tool to perform autonomously• Ground station scheduling and orbit determination

• Experience– 1st revision to be used on HESSI

• HESSI uses GSFC’s ITOS ground system

• Technology Readiness Level => Currently: 4 (SatTrack) => Currently: 2 (New tools) => Phase D: 7

– Ground station schedule conflict resolution• Station view periods, dynamic link margin, S/C emergencies, time constrains

– Flight Dynamics Requirements• Includes comprehensive products such as orbit determination, mission planning

products, state vectors, real-time graphic & alphanumeric displays

Technology Demonstration

ST5 PDR June 19-20, 2001

GSFC

19-30

• The system shall validate the Autonomous Network Scheduling and Orbit Determination S/W (MRD 10108000)– In addition to actual assets for the mission (i.e. 3 S/C and 2 ground

stations), a set of virtual assets (i.e. both S/C and ground stations) shall be simulated and supplied to the Autonomous Network Scheduling and Orbit Determination S/W for processing (MRD 10108020)

– Flight validation of the Autonomous Network Scheduling and Orbit Determination S/W shall be accomplished through comparison of the generated output with standard orbit determination S/W and manual ground resource scheduling techniques (MRD 10108010)

– Anomalous operation of the Autonomous Network Scheduling and Orbit Determination S/W shall not degrade the operation of the S/C (MRD 10108040)

Requirements

ST5 PDR June 19-20, 2001

GSFC

19-31

ST5 Mission Operations Scenario of 3 real and 97 virtual satellites

ST5 PDR June 19-20, 2001

GSFC

19-32

Ground Station(s) Multi-MissionFlight Dynamics

ASIST/FEDS

Mission Planning /Scheduling System

Mission Planning

Load Generation

Ground StationScheduling

Command Loads

Commanding

Telemetry Monitoring

Data Storage

Commands Telemetry

SatTrack

Orbit Determination

Mission Planning Product Generation

Ground Station Scheduling

Orbit Determination

Mission PlanningProduct Generation

Mission Planning Products

Automated STOLProcedure Initiation

Schedules

Tracking Data

Status feedback

Data Flow for SatTrack Validation

ST5 PDR June 19-20, 2001

GSFC

19-33

SatTrack S/W Technology•Used for efficient management and Autonomous

Operation of a Satellite Constellation– Autonomous scheduling of ground station contacts

• Calculate station access based on number of constraints (line-of-sight, geometry, link margin)

– Calculate priorities to resolve conflicts based on various input parameters• data volumes, station capability & availability, science requirements, S/C

emergencies, operator overrides, etc.

– Autonomous Orbit Determination• Derive updated state vectors from angle & range rate measurements

• Verify & archive new state vectors

• Generate mission planning products with new state vectors

ST5 PDR June 19-20, 2001

GSFC

19-34

SatTrack Status•Status

– Requirements document (ST5-495-046) completed

– SOW (ST5-495-045) completed, waiting for proposal

•Major Milestones– S/W delivery 1 (Orbit Determination Tool)-July 2002

– S/W delivery 2 (Automated Scheduling Tool)-February 2003

– Mission Readiness Test-April 2003

Risk Mitigation

ST5 PDR June 19-20, 2001



19-35

ST5 PDR June 19-20, 2001

GSFC

19-36

Risk Mitigation• Risk: No ground stations are currently compatible with ST5

transponder which lead to uncertainties with costs and schedule for upgrades– Mitigation: CSOC has identified potential vendors with a fixed-price cost estimate

• Risk: Actual launch scenario not fully defined resulting in ground system uncertainty– Mitigation: Concerned about ground station visibility to meet requirements for

L&EO, tracking, health & safety, and data recovery

– Preliminary analysis has identified visibility against typical launch scenario

• Risk: Staffing in the timeframe prior & during S/C No.2 & No.3 flow– Mitigation: Relying on subsystem personnel to supplement Mission Operations

activities

– Relying on an existing GSFC MOC facility with most interfaces for Mission Operations in place

Section 19.0 Combined Ground System

Documents

Transcript of Section 19.0 Combined Ground System