1

JWST Functional Flow Diagramsand Schematic Block Diagrams

2

JWST Operational Phases and System Functional Breakdown

Pre-Launch Phase

Approval to ship to the Launch Site

Final Count Down Start

Launch PhaseDeployment & TrajectoryCorrection Phase

Cruise & CommissioningPhase

ObservatorySep from LV

Primary & SecondaryMirror Deployment

Normal Science Operations Phase

Observatory Commissioned

3

JWST Phases and System Functional Breakdown

Pre-Launch Phase

Approval to ship to the Launch Site

Final Count Down Start

Launch PhaseDeployment & TrajectoryCorrection Phase

Cruise & CommissioningPhase

ObservatorySep from LV

Primary & SecondaryMirror Deployment

Normal Science Operations Phase

Observatory Commissioned

Perform Fault Detection and Correction

Generate and Distribute Power

Maintain Observatory Temperatures

Protect Observatory Components from Environments

Collect, Process & Store Engineering Data Downlink Engineering Data Evaluate and Trend Engineering Data

Plan Engineering Activities Uplink Commands Process, Store & Distribute Commands

Determine Orbit&

4

JWST Phases and System Functional Breakdown

Pre-Launch Phase

Approval to ship to the Launch Site

Final Count Down Start

Launch PhaseDeployment & TrajectoryCorrection Phase

Cruise & CommissioningPhase

ObservatorySep from LV

Primary & SecondaryMirror Deployment

Normal Science Operations Phase

Observatory Commissioned

Perform Fault Detection and Correction

Manage Observatory Momentum

Point the Observatory

Generate and Distribute Power

Maintain Observatory Temperatures

Protect Observatory Components from Environments

&

Collect, Process & Store Engineering Data Downlink Engineering Data Evaluate and Trend Engineering Data

Plan Engineering Activities Uplink Commands Process, Store & Distribute Commands

Determine Orbit

Separate from LV

Deploy SA andAcquire SunNull Rates Deploy

HGADeploy Aft& Forward Sunshield

Deploy OTETower

DeploySunshield

DeploySMSS

DeployPM Wings

PerformMCC1

5

JWST Phases and System Functional Breakdown

Pre-Launch Phase

Approval to ship to the Launch Site

Final Count Down Start

Launch PhaseDeployment & TrajectoryCorrection Phase

Cruise & CommissioningPhase

ObservatorySep from LV

Primary & SecondaryMirror Deployment

Normal Science Operations Phase

Observatory Commissioned

Perform Fault Detection and Correction

Manage Observatory Momentum

Point the Observatory

Generate and Distribute Power

Maintain Observatory Temperatures

Protect Observatory Components from Environments

&

Collect, Process & Store Engineering Data Downlink Engineering Data Evaluate and Trend Engineering Data

Plan Engineering Activities Uplink Commands Process, Store & Distribute Commands

Determine Orbit Perform MCC2 Perform MCC2 Perform L2 Orbit Insertion

OTE WF Alignment and Phasing ISIM and SI Initialization and Calibration

Acquire Targets

Manage Vibration

Maintain Fine Pointing Small / Medium Angle Maneuver&

6

JWST Phases and System Functional Breakdown

Pre-Launch Phase

Approval to ship to the Launch Site

Final Count Down Start

Launch PhaseDeployment & TrajectoryCorrection Phase

Cruise & CommissioningPhase

ObservatorySep from LV

Primary & SecondaryMirror Deployment

Normal Science Operations Phase

Observatory Commissioned

Perform Fault Detection and Correction

Manage Observatory Momentum

Slew the Observatory

Generate and Distribute Power

Maintain Observatory Temperatures

Protect Observatory Components from Environments

&

Collect, Process & Store Engineering Data Downlink Engineering Data Evaluate and Trend Engineering Data

Plan Engineering Activities Uplink Commands Process, Store & Distribute Commands

Determine Orbit Perform Orbit Maintenance

Perform WFSC

Plan Science Operations

Perform Science Observations

Perform SI CalibrationsUplink Observation Plan

Process/ Store ScienceData

DownlinkScienceData

GroundProcessScienceData

GenerateObservation Plan Cmds

&

Acquire Targets

Manage Vibration

Maintain Fine Pointing Small / Medium Angle Maneuver&

7

JPLDeep Space

Network(DSN)

JWST Communications System Architecture

GSFCFlight

DynamicsFacility (FDF)

STScI Science & Operations Center (S&OC)

FlightOperationsSubsystem

(FOS)

DataManagementSubsystem

(DMS)

WavefrontSensing &

Control Exec(WFSC Exec)

ProposalPlanning

Subsystem(PPS)

OperationsScript

Subsystem(OSS)

ProjectReference DB

Subsystem(PRDS)

ObservatorySimulators(OTB/STS)

Madrid

NA

SA

Inte

gra

ted

Ser

vice

s N

etw

ork

(N

ISN

)

L2 Point

Launch Segment

Observatory Segment

L2 Transfer Trajectory

Ground Segment

Goldstone Canberra

L2 Lissajous Orbit The launch vehicle injects observatory into an L2 transfer

trajectory

The observatory operates at L2 point for 5 years with a goal of 10 years, providing imagery and spectroscopy in the Near and Mid Infrared wavebands.

The Ground Segment receives downloads of science data and sends command uploads during daily 4 hour contacts

Ground Segment uploads plans to the Observatory ~once a week and the observatory autonomously executes these plans

NASA ProvidedCommunicationAsset for Early

Orbit Phase

8

Observatory Schematic Block Diagram

ISIM COMMC&DH

Omni

HGA

MIRI FPE

Ka-Band Modulator

( x2)

Ka-Band TWTA (x 2)

Switches

OTE

EPS

ACS

Reaction Wheels

(x 6)

Propulsion (Bi-Prop )

SecondaryCombustionAugmented

Thrusters(x 4)

MRE -4 STMs(x 8)

Region 1 Region 2 Region 3

Legends :

ISIM 1553 B-I

Spacewire Discrete -pt to pt

Region 1-(within Si /OA ) Region 2-(within IEC )Region 3-(within spacecraft

bus)

WingDeployment Acts

(x 2) &Latch Acts (x8)

Primary Mirror

Secondary Mirror

Tertiary Mirror

photons

Hexapod(6 DOF)

Hexapod(7 DOF )

x18

Primary Power

Fine Sun Sensors (x2)

Wheel Drive Electronics (x6)

Command Telemetry Processor

NIRSpec

FGS

NIRCam

Sunshield

40 Ah NiH 2

Battery

Coarse Sun Sensors (x4)

Valve Drive Electronics (x 2)

Inertial Reference Unit (1)Tower

Actuators

SMSS Deploy

ActActuator

Drive Unit

SunshieldAct (x6)

RS422

Cold Junction

Box

Solid State Recoder

S/C-ISIM 1553 B-SI

Solar Array

Regulators (x2)

Solar Array (3 panels )

(x2)

S/ C 1553 B-S

Telemetry Acquisition

Unit

M otor Switching Relay

Region 3

Analog /Bilevel

Compressor Assembly

Cooling Lines

Radiator Heat

Switches

Contn Ctrl Htrs

Cryo Tem p

Sensors

MIRI

FGS Guiders FPE /ICE

FGS TF FPE /ICE /TCE

CCE -JT(x2)

CCE -PC(x2)

ISIM Command

& Data Handling

(x2)

IRSU

NIRSpec FPE /ICE /MCE

Star Trackers ( x3)

Solar

ArrayAct (x2)

High Gain Antenna Act (x2)

Mechanical I /F

DIT CE ( x2)

FSM Act

LVDS

Power

Control Unit

S-Band Transponder (x2)

Orientation Drive Electronics with Resolver (x2)

NIRCam FPEs /ICE

MIRI FPE /ICE

9

JWST Phases and System Functional Breakdown

Pre-Launch Phase

Approval to ship to the Launch Site

Final Count Down Start

Launch PhaseDeployment & TrajectoryCorrection Phase

Cruise & CommissioningPhase

ObservatorySep from LV

Primary & SecondaryMirror Deployment

Normal Science Operations Phase

Observatory Commissioned

Perform Fault Detection and Correction

Manage Observatory Momentum

Point the Observatory

Generate and Distribute Power

Maintain Observatory Temperatures

Protect Observatory Components from Environments

And

Collect, Process & Store Engineering Data Downlink Engineering Data Evaluate and Trend Engineering Data

Plan Engineering Activities Uplink Commands Process, Store & Distribute Commands

Determine Orbit Perform Orbit Maintenance