Simplified Configuration Management and Qualification Testing for CubeSats

Transcription

1 Simplified Configuration Management and Qualification Testing for CubeSats Keith Mashburn Space Science and Engineering Laboratory Montana State University August 11,

2 Agenda Overview of Configuration Management Example Configuration Management System Overview of CubeSat Qualification Testing Example CubeSat Qualification Program

3 Overview of Configuration Management Configuration Management (CM) is the process of organizing and maintaining engineering data Components of a simple Configuration Management System (CMS) Document Control Inventory Management Manufacturing Control Flight Assurance Dedicated staff members devoted to CMS activities is a must

4 CMS Implementation CMS DOCUMENT CONTROL PARTS INVENTORY CONTROL MANUFACTURING CONTROL FLIGHT ASSURANCE

5 Document Control Each engineering document issued a sequential number All documents undergo a peer review process to ensure quality Each document contains a coverpage for review signatures and a revision log to track changes After all approval signatures are obtained the document is formally released Changes to released documents tracked using Engineering Change Order (ECO)

6 SSEL Document Control Released documents can be accessed using an online database All document originals are locked in a secure filing cabinet

7 Parts Inventory Control Verify parts meet outgassing requirements All parts purchased from commercial vendors Maintain detailed records of all flight parts in stock All electrical parts stored in ESD safe containers All flight parts stored in locked cabinets

8 SSEL Parts Inventory Control

9 Manufacturing Control Manufacturing Planning should start early in the design phase of the mission Inspection and other hold points should be identified early in planning stage Identify the necessary fabrication, assembly, and testing procedures for all flight hardware and related ground support equipment (GSE) Personnel involved in flight fabrication and testing should be trained in the application area (ESD, Soldering, Polymerics, etc.) At least two persons are required during all flight hardware operations

10 SSEL Manufacturing Control MANUFACTURING CONTROL Prepare MPS Package MPS Acceptance Review Obtain parts kit from inventory control Manufacture assembly per MPS Workmanship Inspection Perform Performance Testing Nonconformances that occur during testing will be tracked with Nonconformance Reports (NCR) 10

11 Flight Assurance Provide oversight during all phases of the integration and test program to ensure the work is performed according to specifications Perform workmanship inspections during fabrication and assembly activities Certify equipment/gse setup prior to execution of all qualification tests Maintain detailed records of all non-conformances that occur during I&T Verify test records and data are adequate to meet test requirements

12 SSEL Flight Assurance

13 CubeSat Qualification Testing

14 Overview of CubeSat Qualification Testing Qualification testing ensures that design is acceptable and that the satellite will function in the expected environments Qualification begins with the completion of the flight hardware and software and ends with the satellite ready for shipment to CalPoly for acceptance testing Qualification testing consists of a series of functional and performance tests, followed by a sequence of environmental exposures The requirements for qualification testing are derived from a variety of sources including the individual mission requirements, the CubeSat program requirements, and the designated launch vehicle requirements

15 Example of CubeSat Qualification Program (1 of 3)

16 Example of CubeSat Qualification Program (2 of 3) Software Development/Validation on EDU Hardware FSW 1.0 Spacecraft Bus Integration CPT #1 Stake and Coat Payload and Flight Battery Integration FSW 1.2 CPT #2 (Pre- Environmental) S/C Bus Bake-Out CPT #3 (Post- Environmental) FSW 1.1 EMI Testing Environmental Testing Vibration Testing Thermal/ Vacuum Testing Mission Ops Testing Deliver to CalPoly for Acceptance Testing

17 Example of CubeSat Qualification Program (3 of 3)

18 CubeSat Environmental Testing (1 of 2) EMI Operate system on nominal RF link and verify operational integrity (Self-Compatibility) Perform conductive/radiated emissions and susceptibility measurements, only if required Vibration Test Perform low-level sine test to confirm modes Perform random vibration to qualification levels Perform low frequency sine vibe, only if required Post- Environmental Performance Testing Thermal/Vacuum Test Operate in thermal/vacuum environment to verify system performance Calibrate on-board temperature sensors Perform mission simulations

19 CubeSat Environmental Testing(2 of 2)

20 CubeSat Delivery and Acceptance (1of 2) CubeSat Pack and Ship Securely pack satellite and GSE for shipment to CalPoly Transport CubeSat via commercial air carrier Delivery Post-shipment inspection of CubeSat and GSE Post-shipment performance test Structural Requirements Confirmation Cal-Poly to verify conformance to CubeSat Standard P-POD Integration Cal-Poly to integrate CubeSats into P-POD Acceptance Testing Cal-Poly to perform vibration testing to acceptance levels on integrated P-POD Final Flight Preparation Cal-Poly perform final battery charging Cal-Poly pull Remove Before Flight (RBF) Pin

21 CubeSat Delivery and Acceptance (2 of 2)

22 Acknowledgements I would like to thank Ms. Celena Byers for all of her hard work on the implementation and maintenance of the SSEL Configuration Management System.

23 Contact Info Keith Mashburn I&T Team Lead: Celena Byers SSEL Configuration Management Specialist:

24 Backup Slides

25 CDH PCB Integration and Test CDH Processor Software Peripheral I/F Storage Perform PCB Assembly Perform workmanship inspection Electrical interface testing Initial Power-up Oscillator measurement or calibration Watch dog functional check Memory read/write verification tests Verify S/W loading capability Perform initial checks of the peripheral I/F

26 EPS PCB Integration and Test EPS BCR Solar Array Digital I/F Board Voltage Regulators Perform PCB Assembly Perform Workmanship Inspection Electrical interface testing Initial Power-up Voltage regulator functional testing Safety inhibit functional testing Safety Inhibits

27 ACS PCB Integration/Verification ACS Magnet Perform PCB Assembly Perform Workmanship Inspection Electrical interface testing Dampening Rod Battery charge/discharge testing

28 COMM PCB Integration/Verification COMM Transmitter r Receiver Amplifier Antennas TNC Perform PCB Assembly Perform Workmanship Inspection Electrical interface testing Initial Power-up Transmitter/Amplifier functional testing Receiver functional testing RF link test and power measurements Watchdog functional testing

29 Payload PCB Integration and Test Perform PCB Assembly Payload Perform Workmanship Inspection Electrical interface testing Particle Detector Initial Power-up Preamp noise measurements I2C Interface functional Payload Plateau Curves

30 Backup Slide: System CPT Plan

31 Backup Slide: System Environmental Test Plan