tailieunhanh - Aerospace Technologies Advancements Fig Part 10

Tham khảo tài liệu 'aerospace technologies advancements fig part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 298 Aerospace Technologies Advancements Satellite Platform Payload SS Ị EPS I ACS Ị TCS DHS Fig. 2. Various satellite subsystems Type of satellite Weight Kg Minisatellite 100 - 1000 Microsatellite 10 - 100 Nanosatellite 1 - 10 Pico satellite 1 Table 2. Nomenclature of satellites according to their weight Satellite architecture overview The Data Handling Subsystem is considered as an interface between the control station and the other satellite subsystems. The Data Handling Subsystem modules include communication subsystem antennas modulator demodulator and on board computer which controls the satellite subsystems. But how these subsystems are attached to the on board computer two principal architectures are distinguished. Communication Subsystem Thermal Control Subsystem On Board Computer Power Subsystem Attitude Control Subsystem Fig. 3. Satellite Star Architecture Star Architecture see Fig. 3 the On Board computer OBC has to run separate data lines to each subsystem. In this architecture the OBC should have many peripheral interfaces equal to the number of satellite subsystems on board and perhaps there will be a problem of wiring. Design of Low-cost Telecommunications CubeSat-class Spacecraft 299 communication Subsystem Fig. 4. Satellite Architecture with linear bus bus Architecture see Fig. 4 in this case all satellite subsystems are connected to a bus which is similar to Local Area Network LAN aboard the satellite. In general we used a Masterslave protocol. The three simple Master-slave bus commonly used in the embedded system are CAN Controller Area Network SPI Serial Peripheral Interface and PC Inter Integrated Circuit . CAN 1 SPI 1 1 PC Low Power 3 5 5 Availability as microcontroller peripheral 2 5 4 Slave hardware complexity 2 5 3 Slave Software complexity 2 5 3 Wiring Complexity 4 3 5 Scalability to two Slaves 5 4 5 discrete logic interfacing ease 1 4 1 Sum 19 31 26 Key 5 best 1 worst Table 3. Master-Slave Buses study in case of two slaves A trade .