themis srr mo-1ucb, july 8-9, 2003 themis mission overview peter r. harvey project manager space...
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THEMIS SRR MO-1UCB, July 8-9, 2003
THEMIS Mission Overview
Peter R. Harvey
Project Manager
Space Sciences Laboratory
University of California, Berkeley
Mission Overview
THEMIS SRR MO-2UCB, July 8-9, 2003
Agenda
AGENDAPrimary Goals
Mission Parameters
Organizations
Personnel
WBS
Processes
Concept
Schedule
Cost
THEMIS SRR MO-3UCB, July 8-9, 2003
SRR Goals
SRR GOALSValidate the Mission Requirements Documentation
- Comprehensive : Do the requirements span the breadth of the effort?- Complete: Are there omissions in the requirements?- Correct: Are the requirements stated correctly?- Consistent: Do the requirements conflict anywhere?- Coordinated: Are the requirements allocated to subsystems
properly?- Verifiable: Are the requirements testable?- Necessary: Are any requirements redundant or unnecessary?
Promote Project-Wide Understanding of the Requirements- Understood: Do subsystems understand their requirements ?- Achievable: Are the subsystem requirements practical?
THEMIS SRR MO-4UCB, July 8-9, 2003
Mission Overview
Mission Parameters– Launch
Vehicle: Delta II, Eastern RangeInjection: 1.1 x 12 Re, 9 degrees
inclinationDate: August 2006 (+/- 2 months)
– Space SegmentSpacecraft: 5 Spinning probes with fuel for orbit/attitude adjustOrbit Period(s): 1, 2 and 4 daysOrientation: Ecliptic normal
– Ground SegmentObservatories: 20 Northern stations for Imaging and Mag Field
– OperationsPhases: L&EO (2 mo), Tail Science,
Flank Magnetopause, Dayside, Eclipse, DeorbitLifetime: 2 years
THEMIS SRR MO-5UCB, July 8-9, 2003
Programmatic Aspects
Programmatic Overview– PI Mode
PI Team Provides Space, Ground, Data SegmentsPI Team Provides Cost, Schedule, Performance Assurance PI Team Provides Education/Public Outreach
– Cost and Schedule CapsSingle Cost Cap for the Mission Launch no later than March 2007
– Performance AssuranceGSFC-410-MIDEX-001C (Nov 28, 1997)GSFC-410-MIDEX-003A (June 25, 2002)GSFC-311-INST-001 (Aug 1996)
Implementation StrategyUse Heritage InstrumentationCoordinate Common Buy Parts Keep Probe/Probe Carrier Simple and Robust
THEMIS SRR MO-6UCB, July 8-9, 2003
Organization
Explorers Office Mission Mgr
Explorers Office Mission Mgr
U.Colo/LASPBob Ergun
U.Colo/LASPBob Ergun
TU-BSUli Auster
TU-BSUli Auster
ESTECPhilippe Escoubet
ESTECPhilippe Escoubet
Swales AerospaceMike Cully
Swales AerospaceMike Cully
THEMIS Organization ChartSubcontracts/Agreements
Phases BCD
U.C. BerkeleyVassilis Angelopoulos, PI
Peter Harvey, PM
U.C. BerkeleyVassilis Angelopoulos, PI
Peter Harvey, PM
KSCMission Integ Mgr
KSCMission Integ Mgr
CETPBertrand
de la Porte
CETPBertrand
de la Porte
GSFC/GNCDKaren Richon
GSFC/GNCDKaren Richon
UCLAJoe Means
UCLAJoe Means
Univ of CalgaryEric Donovan
Univ of CalgaryEric Donovan
Univ of AlbertaJ. Samson
Univ of AlbertaJ. Samson
IWFWerner Magnes
IWFWerner Magnes
THEMIS SRR MO-7UCB, July 8-9, 2003
Organizations
Organization Responsibilities UCB Project Management, Mission Systems Engineering and Quality Assurance
Instrument Data Processor Unit (IDPU) Electric Fields Instrument (EFI) ElectroStatic Analyser (ESA) Solid State Telescope (SST) Magnetometer Booms (for SCM, FGM) Instrument Integration and Test Ground Based Observatory Coordination, All Sky Imager Development (ASI) Mission Ops /Science Ops Center Development Mission Operations & Data Analysis Education and Public Outreach
Swales Spacecraft Probes and Probe Carrier Mission Integration and Test through Launch System Safety Launch Operations and Mission Ops Support to UCB
LASP EFI Digital Fields Boards Design and Test CETP Search Coil Magnetometer and Preamps TU-BS Fluxgate Magnetometer Sensors IWF Fluxgate Magnetometer Electronics UCLA Ground Based Magnetometers
Spacecraft EMC expertise University of Calgary Ground Based Observatory Site Development and Operations University of Alberta Ground Based Observatory Site Development and Operations NASA/KSC Launch Vehicle NASA/GSFC-GNCD Navigation and Control Independent Verification, CelNav
THEMIS SRR MO-8UCB, July 8-9, 2003
Key Personnel
Name Role Recent Experience Harvey Project Manager HESSI, FAST, ClusterII Jackson Mission Assurance HESSI, STEREO Taylor Mission Systems Engineer CHIPS Pankow Lead Mechanical Engineer HESSI, FAST, ClusterII Means EMC/EMI/MAG Cleanliness POLAR Bester Mission Ops Manager HESSI, FAST, IMAGE, CHIPS Berg Instrument Manager HESSI, FAST Sterling Instrument I&T Manager HESSI Keenan Contracts Management HESSI, CHIPS Harps Financial Management HESSI Meilhan Schedule Management - Harris Ground Based Observatories NORSTAR Craig Education / Public Outreach HESSI, CHIPS
THEMIS SRR MO-9UCB, July 8-9, 2003
Processes
Management ResponsibilitiesStaffing and Facilities, Training and Certification
Subcontract Generation and Tracking
Schedule Generation and Tracking (*)
Budget Generation and Tracking
Cost .v. Schedule Compliance
Risk Identification, Risk Tracking, Risk Actions (*)
Descope Identification, Cost Evaluation, Descope Actions
Trade Studies Identification, Evaluation, Change Implementation
Action Item Generation, Distribution and Tracking
Technical & Financial Report Generation
* : Crucial Elements in a Constellation Project
THEMIS SRR MO-10UCB, July 8-9, 2003
WBS
THEMIS ProjectTHEMIS Project
1.1 Management1.1 Management
1.2 Science1.2 Science
1.3 Systems Engineering
1.3 Systems Engineering
2. SpaceSegment
Development
2. SpaceSegment
Development
3. GroundSegment
Development
3. GroundSegment
Development
4. Mission Ops& Data Analysis4. Mission Ops
& Data Analysis5. Education &
Public Outreach5. Education &
Public Outreach
3.1 Mission Operations Center
3.1 Mission Operations Center
3.2 Science Operations Center
3.2 Science Operations Center
3.3 Ground Based
Observatories
3.3 Ground Based
Observatories
4.1 Mission Operations4.1 Mission Operations
4.2 Data Analysis4.2 Data Analysis
1. Management,Science,
Systems Eng.
1. Management,Science,
Systems Eng.
2.1 Instruments2.1 Instruments
2.2 Spacecraft2.2 Spacecraft
THEMIS Work Breakdown Structure
THEMIS SRR MO-11UCB, July 8-9, 2003
Processes
Systems Engineering ResponsibilitiesRequirements Identification and Formalization
Design Coordination, Studies (FTA, FMEA, etc)
Technical Review Coordination, Informal and Formal
ICD Generation
Configuration Control
Verification Plan Development
Design Compliance
Operations Plan Development
Action Item Management
Weekly telecons on S/C bus, Instrumentation, Ground Systems
Periodic On-site meetings
* : Crucial Elements in a Constellation Project
THEMIS SRR MO-12UCB, July 8-9, 2003
Processes
Performance Assurance ResponsibilitiesAssurance Requirements Identification
Implementation Plan
Subcontractor Assurance Plan Reviews
System Safety Support
Supplier On-Site Inspections of Facilities and Procedures
Parts and Materials Research, Selection
Parts Qualification, Procurement incl. Common Buy Program
Verification Planning
Inspections and Test Verifications
Failure Report Management
Weekly telecons on S/C bus, Instrumentation, Ground Systems
Periodic On-site meetings
* : Crucial Elements in a Constellation Project
THEMIS SRR MO-13UCB, July 8-9, 2003
Processes
Risk ManagementUCB/Swales Management Taking Lowest Risk Approach Overall– Assessments Generated by Knowledgeable Engineering– Tradeoffs Discussed with PI for Disposition
Top Phase A Actions Taken to Retire Risk– Simplified Probe Carrier, Launch Sequence– Simplified Probe Maneuvering, Safing– Scheduled Early Testing to Detect Design Flaws– Dropped New Technology HCI and Micro-Gyro
Top Phase B Trades– Changing Probe CPU from 80C196 to Coldfire (GSFC recommendation)– Developed a Possible Larger Tank Configuration – Switched from PDFE to Amptek design of SST electronics Improved Margins and Performance and/or Lowered Risk
THEMIS SRR MO-14UCB, July 8-9, 2003
Consequence Level Technical Performance Impact Schedule Impact Cost Impact Science/Mission Impact
1 Minimal or none Minimal or none Minimal or none Minimal or none
2 Some margin reduction Additional resources required to meet need date
<5% Science objectives impacted or degraded, but science still valid
3 Significant margin reduction Minor slip in need date 5 to 7% A few science objectives not met but mission science still valid overall
4 No margin remaining Major slip in key milestone 7 to 10% Some science objectives not met
5 Below requirement Unrecoverable Project delay >10% Most or all mission science objectives not met
Likelihood Level Likelihood of Risk Occurrence
1 Extremely Remote
2 Unlikely
3 Possible
4 Likely
5 Highly Likely
Processes
THEMIS SRR MO-15UCB, July 8-9, 2003
Approach
M - Mitigate
W - Watch
A - Accept
R - Research
5
4
3
2
1
1 2 3 4 5
LIKELIHOOD
CONSEQUENCES
Med
High
Low
Criticality
20
5X5 Risk Matrix
Risk Analysis
Processes
THEMIS SRR MO-16UCB, July 8-9, 2003
Concept
Essentials for Development & Operation of a Constellation– Control Mass & Power – Minimize Design Flaws – Emphasize Automated Testing and Appropriate GSE – Simple and Robust to Operate.
• Leave Complexity on the Ground.• Minimize On-Orbit Computation (Similar to Lunar Prospector, ST-5)• Use Ground System Computation (Similar to FAST, HESSI)
THEMIS SRR MO-17UCB, July 8-9, 2003
Concept
Control of Mass & PowerPrior Mission Performance Shows Good ComplianceProgram Proposed
MassDelivery Mass
Mass Growth
Proposed Power
Delivery Power
Power Growth
Polar EFI (7 boxes) 36.0 33.3 -7.5% 13.0 9.3 -28.5%Cluster EFW (5 boxes) 16.9 15.4 -8.9% 3.0 3.7 23.3%HESSI Instrumentation 132.1 132.6 0.4% 132.3 142.3 7.6%Average 61.7 60.4 -2.0% 49.4 51.8 4.7%
Margins Held by Management, Trended Monthly
No Changes in Mass/Power since CSR
Allocations Made to the Subsystem Level (inc Contingency)
THEMIS SRR MO-18UCB, July 8-9, 2003
Concept
Minimizing Design FlawsGood Communications Between Developers
– Phase A Developments Used Telecom and Email
– Phase B Will Expand Use of Face-to-face
Engineering Model Tests
– Plan Includes EM Probe & Instrumentation I/F Testing
– Early Identification of Interface Issues
– Early Benefit of Operations Experience & Data Flow Tests
Parts Control
– Common-Buy Parts Program
– Minimize Number of Different Part Types to Limit ALERT Risk
– Maximize Confidence Level in the Parts We Have
THEMIS SRR MO-19UCB, July 8-9, 2003
Schedule
Development and Maintenance
Bottom Up Development• Followed Concept Development• Developers Generated Detailed Schedules• Each Schedule has >30-40 Items• Iterated to Understand Schedules• Did Not Optimize Across Schedules• Generated a Final Master Schedule
Schedule Maintenance• Developers Report to Sub-schedule Monthly• Project Scheduler Updates Master• Provides Status to Project Management• Non-Compliances Get Management Attention• Workarounds include Work Reduction, Addition Support,
ReOrganization
THEMIS SRR MO-20UCB, July 8-9, 2003
Schedule
Key Features
Instrument Development• EM Instrument I/F Testing with EM Probe I/F• Integrate Instrument Complement at UCB Prior to S/C Integration• Instrument Complement F1 Tested First Followed by Pairs• Added Some Facilities for Qualifying Instruments in Parallel
Spacecraft Development• Integration and Test of Probe1 Completed Prior to Probes 2-5• Sufficient Manpower and Equipment for Parallel I&T
Ground Development• Development and Deployment of some GBOs 2 Winters Ahead
THEMIS SRR MO-21UCB, July 8-9, 2003
Resources
Resource Planning
Personnel– Similar to HESSI, Staffing Significantly from Internal and External Sources– Internal: Offloaded CHIPS Development Personnel– External: UC Personnel Hiring within Bay Area
Facilities– Space Physics Research Group is the Largest Group at SSL – Clean Rooms for ESA, SST and Instrument I&T are in SPRG Allocation– Centralized Parts Storage in Flight Parts Storage Room (Unique Sensor
Parts in Labs)
Test Equipment– IDPU has 2 GSE Setups Planned– Sensor GSEs Are Generally a Mixture of Redundant & Special Purpose
Equipment
THEMIS SRR MO-22UCB, July 8-9, 2003
Resources
Total Labor (FTE)
0
10
20
30
40
50
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
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05
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-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Total Labor (FTE)
0
10
20
30
40
50
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
-04
Feb
-05
Jun-
05
Oct
-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Engineering
0
5
10
15
20
25
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
-04
Feb
-05
Jun-
05
Oct
-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Engineering
0
5
10
15
20
25
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
-04
Feb
-05
Jun-
05
Oct
-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Management
0
1
2
3
4
5
6
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
-04
Feb
-05
Jun-
05
Oct
-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Management
0
1
2
3
4
5
6
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
-04
Feb
-05
Jun-
05
Oct
-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Scientists
0
2
4
6
8
10
12
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
-04
Feb
-05
Jun-
05
Oct
-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Scientists
0
2
4
6
8
10
12
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
-04
Feb
-05
Jun-
05
Oct
-05
Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Technicians
0
2
4
6
8
10
Oct
-02
Jan-
03
Apr
-03
Jul-0
3
Oct
-03
Jan-
04
Apr
-04
Jul-0
4
Oct
-04
Jan-
05
Apr
-05
Jul-0
5
Oct
-05
Jan-
06
Apr
-06
Jul-0
6
Oct
-06
Jan-
07
Apr
-07
Jul-0
7
Oct
-07
Jan-
08
Apr
-08
Jul-0
8
Technicians
0
2
4
6
8
10
Oct
-02
Jan-
03
Apr
-03
Jul-0
3
Oct
-03
Jan-
04
Apr
-04
Jul-0
4
Oct
-04
Jan-
05
Apr
-05
Jul-0
5
Oct
-05
Jan-
06
Apr
-06
Jul-0
6
Oct
-06
Jan-
07
Apr
-07
Jul-0
7
Oct
-07
Jan-
08
Apr
-08
Jul-0
8
Programmers
0
2
4
6
8
10
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
Oct
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Feb
-06
Jun-
06
Oct
-06
Feb
-07
Jun-
07
Oct
-07
Feb
-08
Jun-
08
Programmers
0
2
4
6
8
10
Oct
-02
Feb
-03
Jun-
03
Oct
-03
Feb
-04
Jun-
04
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Jun-
08
THEMIS SRR MO-23UCB, July 8-9, 2003
UCB SSL Project LoadingCalendar YearQuarter 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3
THEMIS
(Instruments)
MMS
(Instruments)
SNAP
STEREO(Impact)
Operations
1006 0907 0803 04 05
B C D Esrr pdr cdr per psr
FASTHESSI
THEMIS
A B C D Ezdr cdr pdr fdr
DFM1-2
E
FM1-5
CHIPS
B C D Esrr pdr cdr per psr
FM1-4CC
A
SNAP
UCB SSL Project LoadingCalendar YearQuarter 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3
THEMIS
(Instruments)
MMS
(Instruments)
SNAP
STEREO(Impact)
Operations
1006 0907 0803 04 05
B C D Esrr pdr cdr per psr
FASTHESSI
THEMIS
A B C D Ezdr cdr pdr fdr
DFM1-2
E
FM1-5
CHIPS
B C D Esrr pdr cdr per psr
FM1-4CC
A
SNAP
Resources
Other SSL Project Resource RequirementsSTEREO project is in Conflict
SNAP and MMS Will Help with Offload
THEMIS SRR MO-24UCB, July 8-9, 2003
Cost
Development and MaintenanceBottom Up Development• Followed Schedule Development• Developers Submitted Detailed Requirements• Generated Level 3 Budgets by Month• Iterated with Developers to Understand Costs• Removed Overlapping Efforts between WBS• Generated a Final Master Cost• Generated Comparison Data from Prior Projects• Reviewed and Approved by THEMIS Board of Directors, SPO, UCOP
Budget Maintenance• UCB Financial Data & Subcontractor Reports Matched to Budget• Project Management Comparison of Cost v Schedule• Non-Compliances Get Management Attention• Workarounds include Work Reduction, Addition Support, ReOrganization
THEMIS SRR MO-25UCB, July 8-9, 2003
Cost
Key FeaturesInstrument Development• Integrate & Test at UCB Using Mostly Existing Facilities• Simplified Instrument Interfacing• Automated Instrument Testing at S/C Lowers Extended Travel Efforts
Spacecraft Development• Simplified Probe Carrier Design• Relaxed Probe Attitude Requirements and Simplified Design• Complexity Left on the Ground• Use of Existing Environmental Facilities at GSFC or Md Facilities
Ground Development• Leverage HESSI & FAST Operations • Incorporate GSFC/GNCD Software and Expertise• Utilization of Existing UCB ground station
THEMIS SRR MO-26UCB, July 8-9, 2003
Changes since CSR
Key FeaturesSpace Development• Probe Tanks: Increased Diameter Caused Redesign of EFI SPB• Probe CPU : Change from UCB-provided 80C196 processor card• INST CPU: UCB considering 8085 (HESSI), 80C196 (STEREO)• INST SST : Switched from PDFE to Amptek design• INST SST : Radiation Shielding for Detector
Space-to-Ground Development• COMM: Exploiting L3Com XPNDR to go from 0.4 to 1.0 Mbps
Ground• GBO : Simplifying communications using Iridium
THEMIS SRR MO-27UCB, July 8-9, 2003
Summary
SummaryLeverage Experience in Similar Projects
PI mode projects, Small Spacecraft, End-to-End
Proven ProcessesManagement, Systems Engineering, Quality Assurance, Risk
Simple and Robust Constellation ConceptSimplified Launch Sequence, Fail-safe, Orbit Adjustment
Comprehensive ScheduleSufficient Time for Testing & Problems
Detailed and Verified Cost EstimatesComprehensive, Verified to Models, Good Past Performance
Avoid DevelopmentsNo New Technology Required
THEMIS SRR MO-28UCB, July 8-9, 2003
THEMIS Probe and Probe Carrier
Michael Cully
P&PC Manager
Swales Aerospace
Mission Overview
THEMIS SRR MO-29UCB, July 8-9, 2003
P&PC Project Management
AGENDASwales Organization
Risk Mitigation
THEMIS Cost Basis
FUSE Primary Instrument Structure
EO-1 Spacecraft During ALI Instrument Integration and Alignment
SCONCE
Secondary Payload Adapter For Delta II
ISS Two Tier CCHP Radiator
THEMIS SRR MO-30UCB, July 8-9, 2003
P&PC Organization/Staff
Systems Engineers 97Design Engineers 31Structural/Stress Dynamics Engineers 39Mechanical Engineers 148Thermal Engineers 56Mechanical Designers 57Electrical Engineer 57Contamination Engineers 25Optical Engineers 21Guidance, Navigation & Control Engineers 21Mission Systems & Operations 19Materials Engineers 12Mission Integration and Safety 8Electrical Technician 10Assembly/Integration Technician 85Program Analysis and Scheduling 30Configuration Management 16
Grand Total 732
Engineering
MISSION MANAGER
GSFC/EXPLORERS
Frank Snow
THEMIS PIVassilis Angelopoulos, UCB
PROGRAM MANAGER
Peter Harvey, UCB
CEOTom Wilson, CEO
Frank Hornbuckle, COOElmer Travis, President
PROBE AND PROBE CARRIER
MANAGER
Michael Cully, Director INDEPENDENT REVIEW TEAM
Dan Mark, Deputy DirectorJim Barrowman
Frank VolpeSYSTEMS ENGINEERING
Tom Ajluni, LeadKevin Brenneman
Michael McCullough
QUALITY ASSURANCE
Nick Virmani, Lead*
INTEGRATION & TEST MANAGER
TBD
Electrical SYSTEMS
Avionics - Bob KraeuterPower - Kurt Smithgall
RF/Comm - Bob KraeuterAntenna - Tom Dodd
Harness - Barbara ShiroDigital - John Folk
EGSE - Tammy Faulkner
MECHANICAL SYSTEMS
Chris Lashley, LeadProbes - Rob Eppler
Probe Carrier - Kerri HylanStress/Dynamics Analysts - Chia Chung Lee, Lead
Designer - David Heckle, Lead
GN&C SYSTEMS
Richard LeboeufTHERMAL
Rommel Zara
ACSJinho Kim
RCSMichael McCullough
FLIGHT SOFTWARE & ITOSTHE HAMMERS COMPANY
President & COOSteve Hammers
C&DH - Chris XenophontosProbe Dynamic Simulation - Kathy Blackman
Real Time GS - Greg Geer
FINANCE/ PLANNING
Bruce Reynolds
ADMIN/CMJoseph Procaccino
THEMIS SRR MO-31UCB, July 8-9, 2003
Risk Mitigations
Risk/Potential Impact Risk Mitigation in Design & Program PlanProbe Separation System Design
Probe to Probe & Probe to Probe Carrier Recntact 1) Redesigned PCA layout to provide more static clearance2) Performed extensive separation analysis for Phase A3) Conservative assumptions used in separation analysis4) Performed nominal and multiple off nominal analysis cases
Spacecraft Bus Avionics Unit DesignDelay in design & fabrication resulting in Schedule & Cost impact
1) Computation board design is based on heritage design (STEREO)
2) Power Control board design based on scaled down version of Swales PCE design (EO-1 & SMEX-Lite)3) Communication Board design based on SMEX-Lite design4) Outsource PCB Fabrication & Board Population to experienced qualified vendor.5) EDU BDU built and tested in Phase B
S/C Mass & Power MarginsMass and Power Growth Risk 1) PRO-E models used to develop structural mass & subcontracted component masses based on vendor data from flight
units currently in production2) Current Mass and Power Margins exceed 40% at Phase A for Probe Bus3) Detail power modeling with system designed for worst case eclipse.4) EDU BDU built and tested in Phase B
Spacecraft Long Lead TimesDelay in Probe 1 procurement resulting in Schedule & Cost impact
1) Swales has identified tanks that meet requirements and will CFE Tanks to RCS Integrator. (3 months after start of Phase B). We also have a backup stainless steel tank that could be used pending magnetic cleanliness and mass impact assessment. This will
- Propellant Tanks (critical path) 2) Swales to provide coordinated tooling & flight structure to RCS Integrator to minimize schedule - RCS Hardware Integration (critical path) 3) Several RCS proposals to choose from that meet schedule. (Have had face to face discussions with three vendors)
4) Critical path which is Propellant Tank & RCS integration has a 32 day (working days) float assuming a March 03 start.
- S Band Transponder 5) Have held face to face discussions with Transponder vendor on schedule.
THEMIS SRR MO-32UCB, July 8-9, 2003
Cost/Schedule
Probe & Probe Carrier• Mission Requirements & Instrument Interfaces well defined by UCB• Detail WBS generated for Probe & Probe Carrier. Work well defined by Subsystem
Leads and priced down to 5th level based on recent programs– NRE & RE well defined– Comparison/Analogy – EO1, FUSE & MAP– Detail Engineering/Grassroots
• Long Lead items have been identified and Major subsystem/components rely on hard quotes from prominent Industry suppliers
• Detail Mission Schedule developed & iterated with subsystem Leads in order to time phase costing
• Probe Carrier & Probe Structures costing relies heavily on Swales experience on Commercial Aerospace programs.
• GSFC Testing facility costs for Mission integration based on quotes from Mantech • Following completion of detail costing an assessment was performed using Parametric
techniques based on Aerospace Corporation Small Satellite Cost Model (SSCM 98). Results correlate between Swales detail costing and SSCM within 10%. See detail in Swales Cost Proposal!