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UHF Communication System UHF Communication System UHF Communication - PowerPoint PPT Presentation

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UHF Communication System UHF Communication System UHF Communication System UHF Communication System for Modular Satellite for Modular Satellite for Modular Satellite for Modular Satellite supervisor: Prof. Claudo Sanso Prof. Dante Del

  1. UHF Communication System UHF Communication System UHF Communication System UHF Communication System for Modular Satellite for Modular Satellite for Modular Satellite for Modular Satellite supervisor: Prof. Claudo Sansoè Prof. Dante Del Corso Prof. Leonardo Reyneri candidate: Lv Shuai 21th September, 2010

  2. Agenda Agenda Agenda Agenda � Introduction � Hardware Development � Software Development � Realization and Test � Conclusion

  3. I I ntroduction ntroduction I Introduction ntroduction � AraMiS project � Modular Architecture for Satellite � Evolustion of PiCPoT � RF communication system � S band (2.4GHz) UHF band (437MHz) UHF band (437MHz) � UHF band (437MHz) UHF band (437MHz) � Design Specifications (UHF) small size, low weight, low power, half-duplex, 9600 baud, compatible with amatuer radio

  4. I I ntroduction ntroduction I Introduction ntroduction � UHF System Structure TNC Through microcontroller programming, realize the functionality of a TNC!

  5. Hardware Development Hardware Development Hardware Development Hardware Development � Devices Selection MCU MCU MCU MCU MSP430F149 Transceiver Transceiver Transceiver Transceiver CC1020 � Main Circuit PA PA PA PA RF2175 3 External components ① Input/output matching 1 ② Bias resistor ③ PLL loop filter ④ Crystal 2 ⑤ Decoupling and filtering capacitors 4

  6. Hardware Development Hardware Development Hardware Development Hardware Development � Interface � MCU and OBC (On-Board-Computer) -- USART0 of MCU works in UART mode as a serial bus configuration � MCU and CC1020 1.Configuration -- 3-wire SPI bus 2.Signal MCU is the Slave Tx: USART1 in SPI mode Rx: basic I/O function signal

  7. Software Development Software Development Software Development Software Development � Softare Functionality Modules supply interfaces of CC1020 Realize TNC Functions Functionality to configure CC1020 Communicate with OBC ! AX25.c realized the TNC functionality

  8. Software Development Software Development Software Development Software Development MCU main processing loop （ main.c ）

  9. Software Development Software Development Software Development Software Development TNC Functionality (AX25.C) � AX.25 protocol -- designed for amateur radio � HDLC (High-Level Datalink Control) --NRZI encoding --Bit stuffing --Frame Deliminiting

  10. Software Development Software Development Software Development Software Development � Polynomial scrambling/descrambling (G3RUH standard) � standard 9600 baud modem, 1+x 12 +x 17 � built with logic shift registers and exclusive- -OR gate descrambler scrambler

  11. Realization & Test Realization & Test Realization & Test Realization & Test � Software Tool � Mentor Graphics � PCB realization

  12. Realization & Test Realization & Test Realization & Test Realization & Test � Experiment construction

  13. Realization & Test Realization & Test Realization & Test Realization & Test � Test Environment � Hardware

  14. Realization & Test Realization & Test Realization & Test Realization & Test

  15. Realization & Test Realization & Test Realization & Test Realization & Test � Software 2 state of the system 1 MCU software 3 Control TNC

  16. Realization & Test Realization & Test Realization & Test Realization & Test � Result AraMiS Logo supsequent information

  17. Realization & Test Realization & Test Realization & Test Realization & Test

  18. Conclusion Conclusion Conclusion Conclusion � Realization This project has developed a small size, low wight, low power and amateur radio compatible UHF communication system with 9600 baud data rate. � Future Work � Long range test � Reliability test in radiation environment

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