1. Command & Data Handling October 31 st, 2008 Tyler Tracey Tommy Yuen Karim Barakat

2. October, 31 st 2008 Presentation Outline Subsystem Overview Top Level Requirements LP-1 C&DH Operational Phases Descent Phase Science Phase Data Budget Derived Requirements Future Work 1

3. October, 31 st 2008 Subsystem Overview The Lunar Penetrator Command and Data Handling Subsystem Shall: – gather, process, and format spacecraft housekeeping and payload data for downlink or onboard use – determine and distribute commands to other spacecraft subsystems 2

4. October, 31 st 2008 Top Level Requirements The C&DH subsystem shall: – Be capable of acquiring and processing all “required” data generated by spacecraft sensors at a given time. – Be capable of commanding all subsystems “necessary” at a given time. – Store “important” data generated by spacecraft sensors until it can be reported to the orbiting spacecraft. – Use COTS components wherever feasible 3

5. October, 31 st 2008 LP-1 C&DH Operational Phases 4 Descent Phase [40 minutes] Penetration Phase [1 sec] Science Phase [120 hours] Attitude determination and control will dominate Processing Power [Instructions per Seconds] Payload’s accelerometer feeds data to DSU at high frequency [1 KHz] -Provide control functions for onboard drill -Provide processing power for thermal & power control - Store science & engineering data - Telemetry formatting Report Phase [TBD] -Receive & Store image data from camera [dominate Data Budget] -Receive & store engineering data [health of all components] -Store science data with regards to the penetration phase -Telemetry formatting - Wait for downlink order from relay satellite

6. October, 31 st 2008 Descent Phase Processor EPROM Data Storage Unit Data Bus e.g. -CAN bus -RS 422 Accelerometers RAM Gyroscopes Digital to Analog Converters Multiplexers Main Booster Feedback Engine/Booster ON/OFF Control [0 V – 5 V] 5 Analog to Digital Converters Multiplexers

7. October, 31 st 2008 Digital to Analog Converters Multiplexers Science Phase Feed to Analog components for control functions ON/OFF Control (0 V, +5 V) [Multiplexers required] Processor RAM Data Storage Unit Data Bus e.g. -CAN bus -RS 422 Subsystem health sensors and payload analog components (Analog Outputs) Digital Sensors and components Camera Analog to Digital Converters Multiplexers EPROM 6

8. October, 31 st 2008 Science Data [Payload] Raw Data [bits]Sampling Rate (Hz)Word Size [bits]QuantitySampling Time Camera 640*480 resolution (8 bit depth) 2457600N/A 1 Camera 1024*1024 resolution (8 bit depth) 8388608N/A 1 Mass Spectrometer 3528000181441000 Thermocouple 7056000281441000 Accelerometer 80001000811 Gas analyzers / sensors 3528000181441000 Drill 3528000181441000 Engineering Data [Thermal] Thermocouple 352800001810441000 Engineering Data [Propulsions & ADCS] Accelerometers 1080000.5839000 Gyroscopes 1080000.5839000 Main Booster Feedback 360000.5819000 Engineering Data [Power] Battery Discharge Sensor 3528000181441000 Bus Voltage 3528000181441000 Bus Current 3528000181441000 Engineering Data [Communications] Subsystem Health Data 3528000181441000 Total with 640*480 resolution69749600In Kbits: 69749.6 In Mbits: 69.75 Total with 1024*1024 resolution75680608In Kbits: 75680.7 In Mbits: 75.68 7

9. October, 31 st 2008 Derived Requirements The C&DH system shall – Survive impact and the effects of the environment thereafter for at least 5 days – Store 75.69 Mbits for at least 5 days – Provide [TBA] MIPS processing power for ADCS control algorithm – Fit into a compartment of [TBD] size – Consume less than [TBD] watts 8

10. October, 31 st 2008 Future Work Command budget ADCS processing algorithm (Kalman Filter) Continue to refine our Data Budget (Space Packets) Study and compare existing technologies 9

11. Thank you Questions?