1 / 22

Verifying Implementation Prototype

Verifying Implementation Prototype. Independent Test Capability Team Bill Stanton Jarrod Petersavage Justin Morris Steven Seeger Mike Wise. VERIFYING IMPLEMENTATION. OBJECTIVES. CASE STUDY APPROACH ROLE OF THE PBRA & SRM CASE STUDY RESULTS LESSONS LEARNED FUTURE WORK.

judith
Download Presentation

Verifying Implementation Prototype

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Verifying Implementation Prototype Independent Test Capability Team Bill Stanton Jarrod Petersavage Justin Morris Steven Seeger Mike Wise

  2. VERIFYING IMPLEMENTATION

  3. OBJECTIVES • CASE STUDY APPROACH • ROLE OF THE PBRA & SRM • CASE STUDY RESULTS • LESSONS LEARNED • FUTURE WORK

  4. CASE STUDY APPROACH Navigator Software on GPM Project

  5. WHAT DID WE DO? • Chose a Project  GPM • Examined PBRA Results • GPM PBRA Profile: March 5, 2009 • GPM PBRA-Lite: May 28, 2009 • Chose a small example  Navigator Software • Requirements: • Code is Available • Some Documentation Available • Supporting Tool(s) Available • Modeling Artifacts Available • Successfully Run Code  Executed using EDGE IDE with SimTest Simulator • Develop and Execute Test Cases using Sequences from GPM SRM (Working)

  6. Role of the PBRA and SRM

  7. Role of the PBRA & SRMIdentify Target Behavior(s) GPM PBRA ProfileMarch 5, 2009, Macaulay, Dunkerley System Capabilities J1: Launch and Achieve Initial Orbit J2: Checkout Spacecraft J3: Fly in Required Orbits J4: Obtain Science Data J5: Maintain Health and Safety of Spacecraft J6: Process Science Data J7: Decommission Spacecraft J5 J4 J2 J1 J7 J3 J6 Impact

  8. Role of the PBRA & SRMIdentify Target Behavior(s) “Maintain Health and Safety of Spacecraft Activity Diagram” None H H H H H H Maintain Propulsion System

  9. Role of the PBRA & SRMIdentify Target Behavior(s) Maintain Propulsion System Activity Diagram M Determine Position & Delta-V H M M H H L H H M M

  10. Role of the PBRA & SRMIdentify Target Behavior(s) • Determine Position and Delta-V • Behavior is implemented in the GPS Navigator • The SC determines its position using GPS position information.

  11. Results & Lessons Learned

  12. Case Study Results Accomplishments Future Work • Identified a capability using PBRA & SRM to drive Verification Implementation Activities (Case Study) • Executed Navigator Flight Software using a trial version of a COTS toolset in 2 months • Duration includes obtaining all required tools and artifacts and configuring the environment • Develop serial interface to provide conduit for testing • Utilize Elaborated Sequence Diagrams (to be developed by SRMV PL) to drive test cases

  13. GPM Electrical Block Diagram 13

  14. Navigator Software Simulation • Navigator software runs on a FreeScale ColdFire 5307. • On GPM, the Navigator is part of GN&C and connects to C&DH via RS-422. • GPM has two Navigator units, but we only need to test one. • Initial trial run used EDGE Development suite from Mentor Graphics. • Compiled code as x86 without Nucleus OS code. • Nucleus runtime provided by simtest. 14

  15. Navigator Commands • All Navigator commands and responses are transmitted over RS-422. • ITC team determined that Navigator would be a good place to start because sending and receiving serial data is not difficult. • Navigator commands over serial include read and write memory, patience, and ephemeris data. • Easy proof of concept with simple write and read-back operation. • Can expand simulation further with more complex commands. • CCSDS message format. 15

  16. Issues with Hardware Simulation • Navigator has an RF board that receives GPS signals. • Difficult to simulate. • Developer usescomplex hardwareand softwaresimulation solution. 16

  17. Software Simulation End Goal • Run binaries provided by vendors on an instruction set simulator. • No need to compile Navigator software for x86. • No chance of results varying by build process. • More hardware interaction. • Simulation • Real hardware • Headless operation with all simulations driven by test scripts. 17

  18. Lessons Learned • Working with Trial Versions of Tools often Proves Difficult • Vendor Support • 30-day to 60-day Trial Window • Limited Tool Capabilities • Importance of Communications between Product Lines • Modeling Artifacts help drive Verification Implementation Activities • Importance of SRMV and Verification Task Scheduling • Initial setup time will vary depending on test environment and requirements • Project Leads & Product Lines need to identify Verification Implementation targets early in lifecycle to allow time for tool acquisition, development time, and training • Leveraging of Developer’s Capabilities may prove Beneficial  Parallel Activities

  19. Parallel ActivitiesOther Items being worked by the ITC TeamNot scope of presentation – Information Sharing • SoftSim • All-digital system simulation with flight-like interfaces • Juno and GRAIL missions • VxWorks • Utilized by almost all Science missions • ITC is obtaining trial version, inquiring about licensing, and training • License required to support SoftSim testing

  20. Any Questions?

  21. Backup Slides

  22. Provides Additional Capability“Static versus Dynamic Analysis”

More Related