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Safeguarding the Three Corner Sat Constellation

Safeguarding the Three Corner Sat Constellation. By Stephen Levin-Stankevich Stephen Nauman. Mission Overview . Joint project between the University of Colorado, Arizona State University, New Mexico State University, and AFRL. Demonstration of formation flying.

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Safeguarding the Three Corner Sat Constellation

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  1. Safeguarding the Three Corner Sat Constellation By Stephen Levin-Stankevich Stephen Nauman

  2. Mission Overview • Joint project between the University of Colorado, Arizona State University, New Mexico State University, and AFRL. • Demonstration of formation flying. • Stereoscopic imaging to determine cloud heights. • Demonstrate capabilities of innovative artificial intelligence software, CASPER, developed by JPL.

  3. Mission Requirement • The mission should demonstrate constellation autonomy by using SCL. • The on-board system shall perform constraint and rule checking. • The mission shall use SAMMI as the ground station user interface.

  4. SCL Stores each h&s set in database. Rules can react to faults in the h&s. Real-time analyses of system values for constraint checking CASPER Analyzes resources before starting a task. Continuously re-evaluates the schedule. Avoids conflicts with locked resources. Autonomous Safeguarding

  5. SCL Overview • A scripting language used to carry out tasks that require many flight software commands to the hardware. • Contains a database for each satellite that carries the most recent health and status. • Performs continuous rule checking for analysis of satellite’s health.

  6. Rules are a reaction to an event that already occurred on satellite. Allow for solutions to failure mode effects. Autonomous safeguarding of satellite Rule change_master Subsystem none Category power Activation yes Continuous no if volt_batt <= 10.5 and master_sv = satellite_name_sv then --give master duties to diff. Sat. execute schedule_change_master in 1 tick end change_master SCL Rules

  7. SCL Constraints • Constraints allow for prevention of faults on the satellite. function reject_crosslink dest_sat if dest_sat = 1 or dest_sat = 2 or dest_sat = 3 then if isl_mode_sv = 0 then rtedebug "cannot send via crosslink because out of isl mode" return yes end if end if return no end reject_crosslink

  8. Constellation Commanding • One satellite is designated as master and controls the other two designated as slaves. • CASPER runs on the master only. • SCL controls each slave autonomously.

  9. What is SAMMI? • SAMMI is a GUI that allows the mission operator to control and monitor the Satellite. • SAMMI consists of: • The main page: Monitor all three satellites at once. • Three master pages: Monitor all the sub-systems of each satellite. • The subsystem pages: Display all the values retrieved from the health and status • The plots: Will plot the h&s values over time.

  10. What will SAMMI do? • Retrieve data from the health and status package sent by the satellite. • It will display these values on the screen with a sensor that will determine if they are within nominal ranges. • A history of these values can also be displayed in a graph. • Retrieve data from STK and tell the user when the satellite will be in range of a ground station. • Interface with SCL, so the user will be able to issue commands from the SAMMI master page. • The user will be able to find and see the problems easily.

  11. Summary • SCL will provide autonomous safeguarding of the satellite • Rules will continuously monitor sensors and states to protect the satellite • SAMMI will allow quick error detection and analyses on the ground.

  12. Acknowledgements • Colorado Space Grant Consortium • Air Force Research Laboratories • University of Colorado Space Grant Staff • Dave Beckwith • Elaine Hansen • Chris Koehler • Elaine Hansen

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