Research On And Implementation Of The Key Technologies Of High-speed Data Bus

With the rapid development and more and more complicate of the spacecraft avionics system, ita networking mode should be improved to meet the requirement of more advanced avionics system.However, it is prohibitively expensive to install new cabling system in legacy aircraft.So it is urgent to design a high performance data bus system which has the ability to add new capability to existing platforms without disturbing existing hardware and software.In this dissertation, the detail methods of implementing high-speed data bus system which is based on OFDM technique are researched. Firstly,the feasibility of high performance data bus system is illuminated on the basis of the commuacation environment of MIL-STD-1553 bus and the theory of OFDM.Secondly,the structure of high performance data bus system and some correlative theories are discussed.Thirdly some problems related to the high performance data bus system are particularly introduced so that the system scheme which was verified can be put forward.Based on these elements,the material design of pipelining FFT/IFFT and digital down converter based on FPGA is specified.Under the system needs of digital logic resources and the scheme of IF,an OFDM program based on EP2S60,AD9433 and DAC904 is presented. Fourthly, the design schemes of power amplifer, analog filter and duplexer are introduced for the system demand.finally, the whole system is tested, and the test result indicated that the system could work well and the design's purpose is achieved.