Mission Enabling Compact Avionics Systems

Transcription

1 Mission Enabling Compact Avionics Systems Next Generation Cubesat Bus Design Brian Tubb

2 Ø Cubesat Limitations Rundown Ø Previous Bus Design Ø Results Problems Outline Ø Paradigm Shift with Lightsail CP7 Ø New Requirements Ø New Bus Design Ø Design Philosophy Ø System Board Software improvements Ø Interfaces Structure Ø Conclusions

3 Cubesat Limitations Price Volume Power

4 Legacy Design CPx Bus Two Avionics Boards: C&DH + Comm Power Board

5 Flights: CP3 CP4 CP6 CP5 [integration stages] Issues: Struggle with COMM system required multiple C&DH revisions Proprietary µcontroller programming software Redundancy caused more issues than stability Interprocessor Communications Layout/Assembly complexity Legacy Design CPx Bus Core Bus takes up large volume

6 New Polysat Projects CP7 Lightsail New Design Requirements Large Payload Volume Requirements High Power Consumption Massive amounts of data form factor

7 Hardware Deployment Power Up Interfaces Electronics Interboard Stack Connector :$);<+/'(%),/ Umbilical B Interface 3-Axis Gyro Daughterboard B Interface CMOS ISI Payload DEPLOY Structure Ground Point Interboard Stack Connector Payload Programming FFC Module FFC (5.5V Max) CMOS ISI Payload DEPLOY AT91SAM9G20 Processor (Linux) Payload 64MB SDRAM 512MB NAND 32MB PCM MicroSD Up to 32GB Real Time 1 Watt Clock :$);<+/'(%),/ Daughterboard A Interface Umbilical A Interface Next Gen System Board REBOOT!"#$%&'()*"(+,. :-#$+&'(%),/!"#$%&'()*"(+, -!"#$%&'()*+,-'.%/"0+'12345'6%&78)09

8 RF Shield Low Noise Amplifier Transciever 70cm UHF Linear Regulator Temp Sensor RF Amplifier >1W Add UHF Comm REBOOT Daughterboard A Interface =>?'@)"AB$+,C%),/ Umbilical A Interface Umbilical B Interface Payload Programming FFC :$);<+/'(%),/ CMOS ISI Payload DEPLOY Interboard Stack Connector AT91SAM9G20 Processor (Linux) Payload 64MB SDRAM 1 Watt 512MB NAND 32MB PCM MicroSD Up to 32GB Real Time Clock 3-Axis Gyro Hardware Deployment Power Up Interfaces Electronics CMOS ISI Payload DEPLOY Interboard Stack Connector :$);<+/'(%),/ Daughterboard B Interface Module FFC (5.5V Max) Structure Ground Point :-#$+&'(%),/!"#$%&'()*"(+, -!"#$%&'()*+,-'.%/"0+'12345'6%&78)09

9 Add Side Panels & Antenna Low Noise Amplifier Transciever 70cm UHF RF Shield Linear Regulator Temp Sensor RF Amplifier >1W Buffer Hub 2-Axis Sun Sensor 3-axis Magnetometer REBOOT Daughterboard A Interface Umbilical A Interface Umbilical B Interface Payload Programming FFC 2-Axis Sun Sensor 3-axis Magnetometer Torquer Coils Solar Cells Torquer Coils Solar Cells 5.0V Sides Sides DEPLOY Interboard Stack Connector AT91SAM9G20 Processor (Linux) Payload 64MB SDRAM 1 Watt 512MB NAND 32MB PCM MicroSD Up to 32GB Real Time Clock 3-Axis Gyro Hardware Deployment Power Up Interfaces Electronics CMOS ISI Payload DEPLOY Interboard Stack Connector :$);<+/'(%),/ :7/+'D)8+0#'1GHEIJ'GHEKJ'GF9' Side Side Panel Side Panel FCC's Side Panel FCC's Panel Side FCC's Panel FCC's FFC's 5.0V :7/+'D)8+0'1EF9 Daughterboard B Interface!"#$%&'()*"(+, - Module FFC (5.5V Max) Structure Ground Point :-#$+&'(%),/!"#$%&'()*+,-'.%/"0+'12345'6%&78)09

10 ~30mm 1U CubeSat

11 1U Concept Example Low Noise Amplifier Transciever 70cm UHF RF Shield Linear Regulator Temp Sensor RF Amplifier >1W!"#$%&'()*+,-.&,/ 2-Axis Sun Sensor 3-axis Magnetometer Torquer Coils UTJ Solar Cells Buffer Hub 2-Axis Sun Sensor 3-axis Magnetometer Torquer Coils UTJ Solar Cells 5.0V Sides Sides DEPLOY Daughterboard A Interface Interboard Stack Connector REBOOT Umbilical A Interface Umbilical B Interface AT91SAM9G20 Processor (Linux) 1.8V Camera 64MB SDRAM 5.0V Reg 1 Watt 512MB NAND 32MB PCM MicroSD Up to 32GB Real Time Clock 3-Axis Gyro Hardware Deployment Power Up Interfaces Electronics Payload Programming FFC CMOS ISI 1.8V Camera DEPLOY Interboard Stack Connector 3MP OV Y Axis 2.5V Reg 8 Watts Reg 2.8V Camera Camera CMOS ISI Level Shifter LVDS 20Mbps 30pin DF19 Interface LVDS 2.5V 5.0V!"#$%&'()#*&+#, 01/+$2&3+4:$5FG6HI$FG6JI$F78$ Side Side Panel Side Panel FCC's Side Panel FCC's Panel Side FCC's Panel FCC's FFC's 5.0V Daughterboard B Interface Module FFC (5.5V Max) Structure Ground Point 0>:*+;$<.&,/ 3MP OV Y Axis 2&>4.&/$K3*+,L&?+$<.&,/ 01/+$2&3+4$5678 Or.. 9':*.;$<&=+,>$2&?@:$5ABCD$E.;13&48

12 1U Concept Example ~23mm Avionics Custom Pack fits in nooks crannies based on Payload geometry Two 3MP imagers included in first 23mm. Do not interfere with Solar Cells

13 CP7 Example CP7 Payload

14 CPx Legacy Bus Ø Integrated Comm C&DH into one PCB Ø Separate power board with battery monitors with connectors to side panels payload Multiple Comm issues required C&DH redesigns, resulting in multiple code bases, scattered designs, inability to black box design. Next Gen Bus Ø Integrated Power C&DH into one PCB Ø Separate Comm daughterboards RF is difficult to design. Separating the rest of the system mitigates noise, simplifies testing, allows flexibility in the Comm system. Separate Board for flexibility in choice mounting location.

15 Software Linux 2.6 kernel Memory management, process hling, communication protocols free Linux experience common in Universities Stable code base for future development

16 Opportunities Implications Remote Development Students familiar with Linux through basic classes Flexibility where it counts Comm system Module Panel Development Shorter development cycle Larger focus on payload

17 Conclusion Smartphone design philosophy More capable, more stable Developer friendly: Linux, SSH, Umbilical Payload Focus Larger available volume Mission-Adjustable Module More stable avionics = quicker delivery