Brazilian Inter-University CubeSat Mission Overview
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1 Brazilian Inter-University CubeSat Mission Overview Victor Menegon, Leonardo Kessler Slongo, Lui Pillmann, Julian Lopez, William Jamir, Thiago Pereira, Eduardo Bezerra and Djones Lettnin. EMBEDDED SYSTEMS GROUP (GSE) gse.ufsc.br Florianópolis/SC - Brazil 11 th CubeSat Developers Workshop San Luis Obispo, April 24 th, 2014
2 University 1 Federal University of Santa Catarina (UFSC) Florianópolis/SC - Brazil Brazil
3 Agenda 2 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
4 Agenda 3 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
5 Funding 4 Brazilian Space Agency (AEB) National Council of Scientific for Technological Development (CNPq)
6 Partnership 5 Federal Institute of Santa Catarina (IFSC)
7 Agenda 6 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
8 Introduction 7 The project s main goals are: To inspire both undergraduate and graduate students to work in the space field To establish a strong cooperation network among industry and university institutions It is our first cubesat project.
9 Introduction 8 The system was divided in modules in order to make it reusable in future projects and to make tests and formal verification. General Architecture
10 Agenda 9 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
11 Communication system: Requirements 10 The Communication subsystem verify the integrity of the frame and the command received from a ground station. A beacon transmitter is required using independent communication resources: The beacon must send data from the Power System Even if the Communication System fails, the Beacon should always be able to send Power System data The beacon must avoid unnecessary battery consumption
12 Communication system: Architecture 11 Downlink Beacon Radio Transmitter Encoder Microcontroller Energy Transceiver Microcontroller Downlink HPA Switch Radio Transmitter & Modulator Encoder (encapsule AX.25 frame) Control Unit I2C Bus Protocol I2C Data Bus Control Bus Uplink LNA Radio Receiver & Demodulator Decoder (decapsule AX.25 frame)
13 Communication system: Architecture 12 Downlink Beacon Radio Transmitter Encoder Microcontroller Energy Transceiver Microcontroller Downlink HPA Switch Radio Transmitter & Modulator Encoder (encapsule AX.25 frame) Control Unit I2C Bus Protocol I2C Data Bus Control Bus Uplink LNA Radio Receiver & Demodulator Decoder (decapsule AX.25 frame)
14 Communication system: Architecture 13 Downlink Beacon Radio Transmitter Encoder Microcontroller Energy Transceiver Microcontroller Downlink HPA Switch Radio Transmitter & Modulator Encoder (encapsule AX.25 frame) Control Unit I2C Bus Protocol I2C Data Bus Control Bus Uplink LNA Radio Receiver & Demodulator Decoder (decapsule AX.25 frame)
15 Communication system: Architecture 14 Downlink Beacon Radio Transmitter Encoder Microcontroller Energy Transceiver Microcontroller Downlink HPA Switch Radio Transmitter & Modulator Encoder (encapsule AX.25 frame) Control Unit I2C Bus Protocol I2C Data Bus Control Bus Uplink LNA Radio Receiver & Demodulator Decoder (decapsule AX.25 frame)
16 Agenda 15 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
17 Power System: Orbit Modeling Considerations 16 Worst case orbit Equator plane Circular orbit Altitude: 310 Km Antenna's face always pointing to Earth 5 faces covered by solar panels Free rotation around 'z' axis
18 Power System: Interorbital Solar Panel PCB solar cells per PCB 5 sets in parallel of 3 cells in series Open circuit voltage per set: 6.6 V Total short-circuit current: 155 ma Source: interorbital.com
19 Power System: Orbit Modeling Simulation 18 Average power: W
20 Power System: Architectures 19 At least three different architectures Allow students to design the complete architecture (from design to implementation) Compare architecture's performance (simulations and experiments) Select the best one for the satellite
21 Power System: Architecture 20 Solar panel current measurement Dropout converter to 4.2 V Battery monitoring Multiple power buses 3.3 V and 5 V (on/off) OBC controlled (SPI or I²C and 1 Wire) Dedicated µc (MSP430) (Architecture 2) MPPT ICs (Architecture 3)
22 Power System: Architecture 21
23 Agenda 22 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
24 On Board Computer (OBC) - Software Solution 23 Applications E Measarument Monitor Command Log Telemetry RTOS AE FreeRTOS Drivers Basic intermodule communication Attitude Driver Power System Driver Communication Driver Payload Driver Hardware
25 On Board Computer (OBC) - Software Solution 24 Applications E Measarument Monitor Command Log Telemetry RTOS AE FreeRTOS Drivers Basic intermodule communication Attitude Driver Power System Driver Communication Driver Payload Driver Hardware
26 On Board Computer (OBC) - Software Solution 25 Applications E Measarument Monitor Command Log Telemetry RTOS AE FreeRTOS Drivers Basic intermodule communication Attitude Driver Power System Driver Communication Driver Payload Driver Hardware
27 OBC: Measurement Application 26
28 OBC: Monitor Application 27
29 OBC: Command Application 28
30 OBC: Telemetry Application 29
31 OBC: Log Application 30
32 On Board Computer (OBC) - Software Solution 31 E Measarument Monitor Command Log Telemetry AE FreeRTOS Basic intermodule communication Attitude Driver Power System Driver Communication Driver Payload Driver Hardware
33 OBC: Operating System 32 Reliability Architecture compatibility Allow application priority setup Power and memory consumption Library availability
34 Agenda 33 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
35 Attitude Control System 34 Passive attitude stabilization: Permanent magnets and hysteresis rods Stabilization in only two of three rotation axes.
36 Agenda 35 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
37 Payload Targets 36 To study COTS FPGA s behavior when exposed to radiation To study energy harvesting technologies applicable to nano-satellites environment PCB of the FPGA board used in the payload
38 Agenda 37 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
39 Ground Station 38 UHF Antenna: Frequency: MHz Forward Gain: 15.5 db VHF Antenna: Frequency: MHz Forward Gain: 11.1 db Source: AEB
40 Agenda 39 Partnership Introduction Subsystems Communication System Power System On-Board Computer Attitude Control System Payload Ground Station Launching Conclusion
41 Launching 40 Launching is planned for 2016 Source: interorbital.com
42 Conclusion 41 The requirements and the features of each subsystem were defined The students are learning, being inspired and enjoying the project Besides, they are exchanging information with other universities and institutes Also, students are learning and feeling what is like to be in a real engineering project
43 Thank you for your attention! 42 Victor Menegon EMBEDDED SYSTEMS GROUP / UFSC gse.ufsc.br
University. Federal University of Santa Catarina (UFSC) Florianópolis/SC - Brazil. Brazil. Embedded Systems Group (UFSC)
University 1 Federal University of Santa Catarina (UFSC) Florianópolis/SC - Brazil Brazil Agenda 2 Partnership Introduction Subsystems Payload Communication System Power System On-Board Computer Attitude
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