glast large area telescope: ioc subsystems wbs: 4.1.b david lung

GLAST LAT Project CDR/CD-3 Review May 12-16, 2003

Document: LAT-PR-01967 Section 5 IOC Subsystem 1

GLAST Large Area Telescope:GLAST Large Area Telescope:

IOC SubsystemsWBS: 4.1.B

David LungStanford Linear Accelerator CenterIOC Subsystem Manager

[email protected]

Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope



TopicsTopics

• IOC Overview– Key Events– Interfaces– Requirement flow– Data path– Commanding path

• LAT Operations– Launch and turn on– A day in life



IOC OverviewIOC OverviewGamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope



Key EventsKey Events

• IOC Subsystem Peer Review – November 2003• IOC Subsystem CDR – February 2004• IOC readiness dates to support the Mission Ground Readiness

Testing– Ground Readiness Testing #1: November 2004

• First transmission of Level 0 data from MOC to IOCs • IOC Ready by August 2004

– Ground Readiness Testing #5: September 2005• Required Level 1 processing with transfer of results to

SSC• IOC Ready by September 2005



Instrument Operations Center OverviewInstrument Operations Center Overview

• Receive Level 0 data telemetry packets from Mission Operations Center (MOC)

• Perform science data production to generate Level 1 products

• Build and verify commanding plan for LAT instrument

• Support housekeeping monitoring of the instrument for health and safety

• Verify instrument performance and trending

• Archive all Level 0 telemetry packets and Level 1 products

GBM IOC

MissionOperations

Center(MOC)

LAT IOC

LOFDPFSAS

ScienceSupportCenter(SSC)

Raw Data

Com mands

LAT Data

Instrument TableS/W Loads

Instrument HSK

Standard ProductsSchedules/Com mandingProcessing Algorithm sData Archival

Schedules/Com manding

GCN

RefinedAlerts

Alerts

GBM Data

W hite Sand Complex

USNM alindi

AlertsUploads

TDRSGLAST



IOC Functional ArchitectureIOC Functional Architecture

Mission Operations Center

Science AnalysisSoftw are Group

InstrumentPerformance

Evaluation Group

ScienceSupportCenter

Instrument Operations Center(IOC)

Data Processing Facility

HousekeepingData

Science DataProduction

Commanding

Level 1 Products

Instrument Monitoring

Flight Softw areSupport Group

Science Analysis

LAT Operations Steering Committee(Suggested)

LAT UserCommunity

Le

vel

0 &

HS

KT

ele

met

ryNom inal

Com manding

ContingencyCom manding

LAT TEAM

Operation Communication & Interfaces

Burst AlertMessages via GCN



Ground Operations – Data PathGround Operations – Data Path

Level 0Data

Storage

SciencePackets

HousekeepingPackets

HSK Data EUConversion

(Convert bits to values)EU CalibrationData

ReconstructionCalibration

(Dead strips)


(X,Y,Z)


(Energy)Reconstruction

SAS Processing SW

Portion HSK Data (T, V, I)

Level 1Products

Data Display(Display values & plots)

Performance Quick Look(Data & Plots)

Level 1Data

Storage

Level 0 Data

M onitoringFunction

ReportsGeneration

LAT Community

LAT PerformanceEvaluation Function

LAT IOC

InstrumentCommand

GLAST MOC GLAST SSC

Real Tim e TLM(During Contact)

ITOS Display (W eb)

Science Telemetry: 300 Kbps orbit average

20 Mbps X-band data rate

2.5 Mbps S-Band: Real-time telemetry (Housekeeping) , memory dumps, and engineering data dumps



Ground Operations – Commanding PathGround Operations – Commanding Path

2 Kbps Ground Network Command Rate

Timeline Info

LAT Com mandBuild & Review

GLAST TimelineCom mittee

GLASTObservation Plan

Science SupportCenter

M ission OperationCenter

LA

T P

erfo

rman

ce E

valu

atio

nG

rou

p

LAT CM D Simulationsand Verification

Activity Schedule

Flight SW Upload

Calibration Loads

Engineering Loads

LAT IOC

Instrument Cm d& M em ory Load

(Contigency)

IntegratedObservatory

Timeline

IntegratedObservatory

Timeline

InstrumentM em ory Load



• The command and telemetry database is being developed by Flight Software (FSW) for engineering model testing– The schema describing commands and telemetry will

written in a standard meta language (XML or MySQL)– The choice of meta language will be influenced by the ease

of creating/changing/maintaining the data base. – Schema design will be driven by the details of the ITOS and

AstroRT data bases - We must have the ability to translate to either

• Close coordination between FSW, I&T and IOC • IOC will build upon and maintain the software and

database produced by I&T.

Command & Telemetry DatabaseCommand & Telemetry Database



Requirement FlowRequirement Flow

Mission SystemSpecification

433-SPEC-0001

ScienceRequirem ents

Docum ent433-SRD-0001

LAT-SC InterfaceRequirem ents

Docum ent433-IRD-0001

LAT Perform anceSpecification

LAT-SS-00010

LATEnvironm entalSpecification

LAT-SS-00778

LAT IOCPerform anceSpecification

LAT-SS-00015

ACD SubsystemSpecification

LAT-SS-00016

TKR SubsystemSpecification

LAT-SS-00017

CAL SubsystemSpecification

LAT-SS-00018

Trigger & DataflowSubsystem

SpecificationLAT-SS-00019

SASSubsystem


LOFSubsystem


PowerSubsystem


MechanicalSubsystem


Mis

sio

nL

AT

LA

T S

ub

syst

em

ScienceRqm ts

MissionRqm ts

Interface Rqm ts

Interface Rqm ts

TCS Perform anceSpecification

LAT-SS-00715

SAS DesignSpecification

LAT-SS-00505

CAL DesignSpecification

LAT-SS-00210

LAT TriggerSpecification

LAT-SS-00284

LAT TKR DesignSpecification

LAT-SS-00134

LAT OperationsFacility


Tower PowerSupplies


ACD DesignSpecification

LAT-SS-00352

De

sig

n S

pe

cifi

cat

ion

LAT DataflowSpecification

LAT-SS-00285

LAT Flight SWSpecification

LAT-SS-00399

LAT ReadoutE lectronic


LAT IOC/MOC/SSC Interface

ControlDocum ents

Radiator DesignSpecification

LAT-SS-00394

X-LAT P lateDesign


Grid Box DesignSpecification

LAT-SS-00775

LAT-SC InterfaceControl

Docum ents

Mission GroundSystem

Requirem entDocum ents

Changes since PDRChanges since PDR



LAT OperationsGamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope



Launch ConditionsLaunch Conditions

• LAT instrument is OFF from pre-launch through spacecraft solar array deployment and thermal stabilization

• 96 telemetry points will be used for LAT monitoring via the spacecraft bus prior to LAT turned-on– Temperature– Voltages

• S/C unregulated survival feeds enabled the following LAT heaters

– Radiator Antifreeze– Grid Make-up

• Post S/A deployment and first contact, the S/C PRU will enable the regulated VCHP feed

– VCHP reservoir heaters



LAT Analog TelemetryLAT Analog Telemetry

LAT-SS-00890 Draft LAT Instrumentation Plan

PRELIMINARY - NOT YET APPROVED Rev Date: 03-Mar-02Print Date: 09-Apr-03

Description of Instrumentation Source of InstrumentationResistance Side of Spacecraft PDU

Description Group Type Part No. Min/Max Resolution Accuracy Range SS Location Shield SC-Pri SC-Sec

ACD Tiles Thermal RTD -100/100 1.0 C 0-5000 ACD Top/Sides of ACD on tiles Out 5 5Radiators Thermal RTD -100/100 1.0 C 0-5000 Mech On Radiator panels/VCHP's Out 8 8VCHP's Reservoir Htr Thermal RTD -100/100 1.0 C 0-5000 Mech VCHP reservoir htr's Out 12 12ACD TSA Shell (inside) Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K ACD Insides of ACD Shell facing TKR In 5 5ACD PMT Rail Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K ACD ACD PMT Rail structure in BEA Out 4 4SIU Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K Elec SIU box at interface to X-LAT Pl In 2 2PDU Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K Elec PDU box at interface to X-LAT Pl In 2 2GASU Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K Elec GASU box at interface to X-LAT Pl In 2 2Grid-Radiator interface Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K Mech Rad Mnt Bkt end, base, Grid corner Out 4 4Grid Make-up Heaters Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K Mech Corners of Grid at thermostat location Out 4 4VCHP-XLHP interface Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K Mech VCHP-XLHP at bolted joint Out 4 4X-LAT Plate Thermal Thermistor YSI-44909 -40/60 0.25 C +/- 1.0 % R 7599 -884.6K Mech Top side of X-LAT Plate on heat pipes Out 4 4SIU Pri/Sec 3.3/5V V Voltage Elec SIU Pri/Sec 3.3/5V V In 2 2PDU Pri/Sec 3.3V V Voltage Elec PDU Pri/Sec 3.3V V In 2 2GASU Pri/Sec 3.3/28V/3.3VA VVoltage Elec GASU Pri/Sec 3.3/28V/3.3VA V In 2 2VCHP Reservoir Htr Pri/Sec Voltage Mech VCHP Reservoir Htr Out 4 4LAT SIU Bus V Pri/Sec Voltage Elec SC Output to SIU Bus Out 2 2LAT VCHP Bus V Pri/Sec Voltage Elec SC Output to VCHP Bus Out 2 2Spare Voltage Channels Voltage 18 18Spare Temp. Channels Thermal Thermistor 8 8Total 96 96For Thermistors, zero power resistance @25 C is 30000 ohmsTest Plug is for fly-away instrumentation (used only for ground test but not removed for flight)Light green shading indicates LAT-relevent monitoring performed internally by the spacecraft.All voltages are 0-5V or 0-x V, wait til SA suggests what is convenient for them.



LAT Turn On State DiagramLAT Turn On State Diagram

Off Pre-deployLAT

SurvivalLAT Hardware Safe T&DF On Detectors On Standby Observing

Off Pre-deploy

0100200300400500600700

TCS Safe NominalOp

era

tin

g M

od

es

LA

TT

he

rma

l

Orb

it-A

ve

rag

eP

ow

er

Dra

w (

W)

VCHP Surv TotLAT

0100200300400500600700

SIU

PDU

GASU

TKR

ACD

CAL

TEM VCHP

Surv

EPU

SIU

PDU

GASU

TKR

ACD

CAL

TEM VCHP

Surv

EPU

SIU

PDU

GASU

TKR

ACD

CAL

TEM VCHP

Surv

EPU

SIU

PDU

GASU

TKR

ACD

CAL

TEM VCHP

Surv

EPU

SIU

PDU

GASU

TKR

ACD

CAL

TEM VCHP

Surv

EPU

SIU

PDU

GASU

TKR

ACD

CAL

TEM VCHP

Surv

EPU

SIU

PDU

GASU

TKR

ACD

CAL

TEM VCHP

Surv

EPU

0W 50W 270W 320W 560W 650W 650W

Indefinite

VCHP = VCHP Htr. BusSurv = Survival Htr. Bus

LAT= LAT Main Power BusTot = LAT Total Power

OffOn

Transition

-20-10010203040

-30-20-10010203040

-30-20-10010203040

-30

Ob

s.

Launch andAscent

Standby/EngineeringEarly Orbit Engineering Sky Survey

Survival

LaunchFairing Separation

Fairing Sep + TBD min

Solar ArrayDeploy

Initiate LAT Turn-onDetectors on

LAT Boot Up

<TBD min

Te

mp

era

ture

(oC

)S

tatu

s

Transition

Pwr Bus VCHP Surv TotLAT VCHP Surv TotLAT VCHP Surv TotLAT VCHP Surv TotLAT VCHP Surv TotLAT VCHP Surv TotLAT



Instrument Turn-On SequenceInstrument Turn-On Sequence

• Once the spacecraft has establish power positive, thermal stabilization, and out-gassing - the LAT instrument shall be turned-on

• The LAT turn-on is a set of ground command with verification sequences

– Verify telemetry prior to the next operation

• Temperatures• Voltages/Currents• Turn-on profiles• State

• Additional monitoring telemetry are available as the PDU, GASU, and TEMs are turned-on

– PDU: 157– GASU: 57– TEM: 640

HEATERSRadiator Antifreeze

Grid M ake-upVCHP

SIU A On

PDU A On

GASU A On

EPU A/B On

TEM (s) On

ACD On

Tracker Tower 1 On

Tracker Tower 16 On

CAL M odule 1 On

CAL M odule 16 On

TLM CheckVerify Turn-On Profile




Turn-On SequenceSee Turn On Sequence Note

Turn-On SequenceBEA On

ACD FEE Individual Turn-On

Turn-On SequenceSee Turn-On Sequence Note

Turn-On SequenceSee Turn On Sequence Note

Spacecraft PowerFeed 5, 7 & 8

Enabled

Spacecraft PowerFeed 1 & 2

Enabled

Spacecraft PowerFeed 3 & 4

Enabled

Spacecraft LAT

Group 1

Group 2

Group 3

Note:Turn On Sequence (Proposed)

Turn On group A (the center fourTEMs/Trackers/CAL Modules)

Turn On group B (the +Y face) Turn On group C (-Y face) Turn On group D (+X face) Turn On group E (-X face)

A A

A A

B B B

CCC

D

D

D

E

E

E



• Data acquisition– Rocking– Pointed observation– Repoint

• Prior to entering the pre-defined South Atlantic Anomaly (SAA) event, the spacecraft sends LAT a signal safing the high-voltage power supplies within the ACD PMT

• Return to data acquisition upon exiting SAA

• Approximately 6 contacts per day, less than 10 minutes per pass

A Day In Life of LATA Day In Life of LAT

Station Hour Min Sec Hour Min Sec Dur(sec)

MAL 0 24 22.51 0 29 43.81 321.302MAL 7 13 37.42 7 21 29.75 472.326MAL 8 53 48.46 9 4 7.8 619.338MAL 10 36 15.08 10 44 15.15 480.072MAL 19 11 38.69 19 16 8.46 269.762MAL 20 50 18.79 21 0 18.87 600.075MAL 22 31 50.49 22 41 20.96 570.473

AOS LOS

Typical Contact Schedule for Typical Contact Schedule for a 24 hour perioda 24 hour period

(Example is Malindi)(Example is Malindi)



LAT Operation ModesLAT Operation Modes

• LAT operation modes are simple– Observation modes

• Instrument is acquiring data• Valid science data

– Standby Modes

• Instrument is acquiring data

• Invalid science data

– Safing Modes

• Instrument in HW Safe or OFF

Pointed &Repoint

Sky Survey

Observing Modes

Engineering

SAA

Standby Modes

Calibration

Survival

Hardw areSafe

Launch & EarlyOrbit

A = Autonomous

C = Commanded

C C

C

C

C

C

C

A, C

A, C

A, C

Safing

Launch

A, CA, C

SC ModeLAT Modes TCS Modes

Pre-Launch Off Off

Launch/Ascent Off Pre-Deploy

Early Orbit Deployment/Activation LAT Survival TCS Survival

Engineering Transition

Calibration

SAA

Sky Survey Sky Survey Sky Survey Nominal

Pointed and Repointed

Pointed and RepointedPointed and Repointed

Nominal

Observatory Safemode

Independent Safemode

Power Safe Survival Survival

Re-Entry Re-Entry Off Off

Mis

sio

n M

od

es

Instrument

Launch

Standby/Engrg

Safemode

Engineering

Hardware Safe TCS Safe

Nominal



Cost and Schedule SummaryGamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope



Budget, Cost, PerformanceBudget, Cost, Performance

Budget vs Actuals vs PerformanceDOE + NASA Project Expenditures4.1.B Instrument Operations Center

0

1

2

3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FY00 FY01 FY02 FY03 FY04 FY05

$M

, T

hen

-Year

Do

llars

Actual Commitments

ACWPBCWP

BCWS+ Planned CommitmentsBCWS



Cost/Schedule StatusCost/Schedule Status

Item In k$

Budget at Complete 2,512

Budgeted Cost of Work Scheduled (a) 542

Budgeted Cost of Work Performed (b) 486

Actual Cost of Work Performed 262

Cost Variance 224 46.1% of (b)

Schedule Variance -56 -10.3% of (a)

• Status as of March 31, 2003:



CCB Actions Affecting 4.1.BCCB Actions Affecting 4.1.B

Change Request # Description Status

LAT-XR-01752-02 SLAC/HEPL Labor Escalation Rates

Approved -$40K



ProcurementsProcurements

• Long-Lead Procurements• Major Upcoming Procurements Near-Term (< 4 months)

– none• Major Upcoming Procurements Long-Term (>4 months)

– IOC Facility Procurements– Servers, Workstations, Peripherals– Test Equipment

• Minor Upcoming Procurements– none

glast large area telescope: ioc subsystems wbs: 4.1.b david lung

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