1. Simulating A Satellite CSGC Mission Operations Team Cameron HatcherJames Burkert Brandon BobianAleks Jarosz

2. Computer Simulators Two Simulators – Flight Computer and Hardware Two Simulators – Flight Computer and Hardware Run on Linux Computers Run on Linux Computers The two computers send data back and forth The two computers send data back and forth Send commands through Telnet and SCL interface Send commands through Telnet and SCL interface

3. Flight Computer Simulator Simulates the actual flight computer Simulates the actual flight computer Allows VXWorks Allows VXWorks Real Time Operation System developed by WindRiver Systems Real Time Operation System developed by WindRiver Systems Software is run in same environment as the satellite Software is run in same environment as the satellite Can make commands to the hardware Can make commands to the hardware Receives replies from the hardware Receives replies from the hardware

4. Hardware Simulator Accepts requests from Flight Computer Simulator Accepts requests from Flight Computer Simulator Sends realistic replies Sends realistic replies Has different equations to calculate values for sensors Has different equations to calculate values for sensors Simulates every hardware sensor onboard the satellite Simulates every hardware sensor onboard the satellite Ex. Temperature sensors and voltage sensors Ex. Temperature sensors and voltage sensors Certain sensors are set to change dependent upon tasks Certain sensors are set to change dependent upon tasks Ex. Calculated remaining battery charge Ex. Calculated remaining battery charge

5. Satellite Tool Kit (STK v5.0) Modeling and visualization software suite Modeling and visualization software suite Versatile piece of software Versatile piece of software 2-D and 3-D modeling 2-D and 3-D modeling Visualization windows Visualization windows Modeling abilities Modeling abilities Mission design Mission design Sun vs. shade time Sun vs. shade time Access times Access times Scheduling Scheduling Mission simulation Mission simulation Scenarios Scenarios Practice time for Mission Operators Practice time for Mission Operators

6. Mission Training How STK will be used for mission simulation training Simulating real time Data Simulating real time Data Display health and status of CX based off simulators Display health and status of CX based off simulators Recognizing raw telemetry data Recognizing raw telemetry data Failure Management and Error Analysis (FMEA) Failure Management and Error Analysis (FMEA) Telemetry data analysis Telemetry data analysis Create problem scenarios Create problem scenarios Test how satellite will react to different situations Test how satellite will react to different situations Diagnostics Diagnostics Use simulated telemetry to diagnose problems Use simulated telemetry to diagnose problems Troubleshoot problems and create contingency plans Troubleshoot problems and create contingency plans

7. STK – Orbital Mechanics Position Position Telemetry Display Telemetry Display Position Covariance Position Covariance Perturbations Perturbations Collisions Collisions Attitude Attitude Telemetry Display Telemetry Display Tip-off Predictions Tip-off Predictions Communication Communication Power Power

8. STK - Communications Modeling Modeling Ground Yagis Ground Yagis Satellite Transmit Satellite Transmit Satellite Receive Satellite Receive Computations Computations Signal Signal Access Times Access Times Gains Gains Interference Interference RF Environment RF Environment Refraction Refraction Rain Rain System Temperature System Temperature

9. STK - Power Modeling Modeling Size Size Efficiency Efficiency Orientation (Pointing) Orientation (Pointing) Computations Computations Solar Power Solar Power Effective Area Effective Area Solar Intensity Solar Intensity Angle of Incident Radiation Angle of Incident Radiation

10. Spacecraft Command Language (SCL) SCL is a high level scripting language that allows for ease of use in scheduling events and keeping track of the systems sensors using a SCL user defined database SCL is a high level scripting language that allows for ease of use in scheduling events and keeping track of the systems sensors using a SCL user defined database

11. Scripts Each script in SCL runs commands Each script in SCL runs commands The scripts are able to check key variables in the SCL database. The scripts are able to check key variables in the SCL database. All of the scripts have the capability to be put into a schedule. All of the scripts have the capability to be put into a schedule.

12. SCL Database The SCL database is a user defined database that contains any and all variables that the user wishes to monitor. The SCL database is a user defined database that contains any and all variables that the user wishes to monitor. The database is updated at regular intervals with certain scripts that will update parts of the database specific to a certain subsystem. The database is updated at regular intervals with certain scripts that will update parts of the database specific to a certain subsystem. Contains all satellite sensor values Contains all satellite sensor values Calculated values Calculated values

13. Rules and Constraints A constraint limits the values that a variable can be A constraint limits the values that a variable can be A rule is used to alerts the operator if a variable goes beyond a certain range A rule is used to alerts the operator if a variable goes beyond a certain range If a variable goes into a critical range, a rule will take corrective measures If a variable goes into a critical range, a rule will take corrective measures Ex. Shutting off non-critical systems, such as cameras Ex. Shutting off non-critical systems, such as cameras

14. ASPEN Automated Scheduling and Planning ENvironment Automated Scheduling and Planning ENvironment Used to create schedules for SCL Used to create schedules for SCL Mission Operator originally creates schedule by hand Mission Operator originally creates schedule by hand Using ASPEN schedule can be adjusted for any conflicts that occur Using ASPEN schedule can be adjusted for any conflicts that occur Ex. Two commands trying to use the same relay Ex. Two commands trying to use the same relay Schedules are compiled to an SCL executable format Schedules are compiled to an SCL executable format

15. Running a Simulation Schedule is uploaded to the Flight Computer Simulator and executed Schedule is uploaded to the Flight Computer Simulator and executed Commands are sent between the two simulators Commands are sent between the two simulators STK sends information to the hardware simulator STK sends information to the hardware simulator Mission Operators monitors SCL environment and Telemetry GUI during pass times Mission Operators monitors SCL environment and Telemetry GUI during pass times Telemetry GUI monitors the SCL database Telemetry GUI monitors the SCL database Any problematic values will be shown in red or yellow Any problematic values will be shown in red or yellow