1. 1 Arizona State University Senior Design ASU/JPL Flight System Group Members: Robert Hoffman, Dusty Terrill, Adam Nikolic, Josh Ruggiero

2. 2 Arizona State University Senior Design Flight System Sun-Synchronous Earth Orbiting Spacecraft Visible and Infrared Imaging of Regions of Interest Software Simulation: – Flight Dynamics – Instrument Operations – Command and Telemetry Processing – Engineering Health – Status Monitoring

3. 3 Arizona State University Senior Design Management Project Manager: Robert Hoffman System Engineer Mission Control: Abe Hart Code Manager: Filip Mladenovic Scribe: Dusty Terrill Testing Manager: Gary Kahler Documentation Manger and Scribe: Steven Palmer Tool Smith: Josh Ruggiero and Adam Nikolic System Engineer Flight System: Robert Hoffman Code Manager: Adam Nikolic Testing Manager: Josh Ruggiero Documentation Manger and Scribe: Dusty Terrill

4. 4 Arizona State University Senior Design IEEE 1471-2000 System Architecture Design

5. 5 Arizona State University Senior Design Communication Simulated TCP/IP Connection Between the Ground System and the Flight System Utilizing the Consultative Committee for Space Data Systems format for the data packets. CCSDS Header Format: [Version][Packet ID][Second Header Flag][Type][Sequence Flags] [Packet Sequence Control][Packet Data Length] [Secondary Header] Version[3]:Always 000, it’s the first version Packet ID[1]:0 if flight is sending, 1 if ground is sending S.H. Flag[1]:Always 1, there is always a second header Type[11]:Dependent on our command type Sequence Flags[2]:00 – a continuation, 01 – first segment, 10 – last segment, 11 - un-segmented Packet S.C.[14]:Running counter for each command type Packet D.L.[16]:Number of bytes in the array – 1 Sec Header[32]:Contains the timestamp The header will therefore always contain 80 bits worth of data and the following bits will be the data that needs to be sent.

6. 6 Arizona State University Senior Design Prototype Class Diagram

7. 7 Arizona State University Senior Design Subsystems Power Command and Data Handling Telecommunication Mechanical Thermal Propulsion Guidance Navigation and Control Payload

8. 8 Arizona State University Senior Design Power Subsystem & Peripherals Solar Array Battery Power Control Power Switching Power Conversion Cabling

9. 9 Arizona State University Senior Design Command and Data Handling Subsystem & Peripherals Memory Command

10. 10 Arizona State University Senior Design Telecommunication Subsystem & Peripherals Directional Antenna Wide Beam Antenna Transmitter Receiver

11. 11 Arizona State University Senior Design Thermal Subsystem & Peripherals Thermal Sensors

12. 12 Arizona State University Senior Design Propulsion Subsystem & Peripherals Thrusters Reaction Wheels Fuel Tank

13. 13 Arizona State University Senior Design Guidance Navigation and Control Subsystem & Peripherals Star Tracker Sun Sensor Propulsion Control Subsystem Actuator Control

14. 14 Arizona State University Senior Design Payload Subsystem & Peripherals Camera

15. 15 Arizona State University Senior Design Commanding Information CCSDS Timestamp Included Use to sort commands by time Use to acknowledge command received / executed Every command flight receives must be acknowledged Sequence of commands to run Must know the sequence Must be able to save sequence to run at a later time Format of Commands

16. 16 Arizona State University Senior Design Command Formatting Commands received by flight – [7 bit command #] [ 64 bit start time] [ extra command data] Commands sent by flight – [7 bit command #] [ 32 bit received time] [ extra command data] Ensures compatibility among all commands Each commands part of subgroup – Easy to manage commands by type – Easy to add commands later if needed

17. 17 Arizona State University Senior Design Flight Received Commands Propulsion 0) [Fuel Tank Command] [Start Time(ms)] [0] – 0- send fuel remaining [0000000] [64 bit long] [0] [Fuel Tank Command] [Start Time(ms)] [1] - 1- stir tank [0000000] [64 bit long] [1] 1)[Fire Thruster Command][Start Time(ms)][Thruster #][Runtime(ms)] [0000001] [64bit long] [XXXX] [32bit int] Camera 10)[Camera Command] [Start Time(ms)] [Sub Command] [DATA] Sub Commands – Power 00 Calibrate01 Picture10 – [Camera Command] [Start Time(ms)] [Power Command] [On/Off/Rst] – [0001010][64 bit long][00][XX] – 00 Turn Off; 01 Turn On; 10 Reset – [Camera Command] [Start Time(ms)] [Calibrate command] – [0001010][64 bit long][01] - Calibrate – [Camera Command] [Start Time(ms)] [Picture Command] [IR/Reg] [Filter] [aperature] [shutter speed] – [0001010][64 bit long][10][X][XXX][32 bit float][32 bit int] - Take Picture

18. 18 Arizona State University Senior Design Flight Sent Commands Propulsion 00) [Tank Sensor Command][Time(sec)][0][Fuel Left] – [0000000][32 bit int][0][32bit Float] [Tank Sensor Command][Time(sec)][1] – ACK Stir Tanks [0000000][32 bit int][1] 01)[Thruster Command][Time(sec)][Thruster #][0] – Command Received [0000001][32 bit int][XXXX][0] [Thruster Command][Start Time(sec)][Thruster #][1] – Command Executed [0000001][32 bit int][XXXX][1] Camera 10)[Camera Command][Time(sec)][Power Command][On/Off/Rst] – Power Ack [0001010][32 bit int][00][XX] – 00 Turn Off; 01 Turn On; 10 Reset [0001010][32 bit int][01] – Calibrate Ack [Camera Command][Time(sec)][Picture Command][Picture Size(bits)][Picture] [0001010][32 bit int][10][32 bit int][Picture Data (.jpg)]

19. 19 Arizona State University Senior Design Internal Commands Sample flow chart Must simulate all aspects of internal communication Each command is internally represented and handled specifically All internal communications must go across the system bus

20. 20 Arizona State University Senior Design Internal Command Examples Fuel Tank[0]:Send Fuel Remaining Internal command # 1 System bus events:Propulsion.getFuel() Create new packet (Fuel) Telecom.send(packet) Fuel Tank[1]:Stir Fuel Tank Internal command # 2 System bus events:Propulsion.sitrTank() Create new packet() Telecom.send(packet)

21. 21 Arizona State University Senior Design Command Run-Through Example Flight receives command from ground – 0) [Fuel Tank Command] [Start Time(ms)] [0] – 0-send fuel remaining [0000000] [64 bit long] [0] Command parse / execute Send information to system bus – Fuel Tank[0]: Send Fuel Remaining Internal command # 1 System bus events: Propulsion.getFuel() Create new packet (Fuel) Telecom.send(packet)

22. 22 Arizona State University Senior Design Command Run-Through Example Cont… Packet created stores all information [Tank Sensor Command] [Time(sec)] [0] [Fuel Left] [0000000][32 bit int] [0] [32bit Float]

23. 23 Arizona State University Senior Design What Worked Plenty of Brainstorming Working with two groups had more ideas First semester is all planning phase Regular Meetings Proper collaboration with Ground Team Working with JPL Advisor Good direction Good plan of action and organization

24. 24 Arizona State University Senior Design What Didn’t Work Schedule Slippage towards beginning Abundant amount of proper research Redoing reports and paperwork Originally, not enough information Losing UML class diagrams Very difficult command creation Original set not to standards Complete Architecture Reorganization

25. 25 Arizona State University Senior Design Schedule

26. 26 Arizona State University Senior Design Questions?