High-speed Data Acquistion And Playback System Of Design And Realization

The spaceborne SAR signal simulator can generate accurate radar echo, is important in the SAR handware-in-loop simulation system. The radar signal simulation (Radar Signal Simulation, RSS) platform is the important component of spaceborne SAR signal simulator, it is the typical data acquisition and playback system.In this thesis, details on the high-speed data acquisition and playback system for the process is studied on the background of spaceborne SAR handware-in-loop simulation system.The work of this thesis includes three parts as follows:Based on system essential requirements and technical specification, under full investigation and study existing technology premise, the thesis suggested a scheme of designing the high-speed data acquisition and playback system which is composed of high-speed and high precision A/D and D/A converter, high performace FPGA,cPCI bus interface,large capacity SODIMM DDR2 memory.As the control center and transmission bridge,FPGA played a very important part in this system.Based on the system overall project design and the technique of production level, adopts profits from the innovation, the synthetic compare and the careful proof etc methods, reasonable by A/D chip AD9230, D/A chip AD9779, FPGA chip XC4VLSX35, cPCI bus bridge joint chip PCI9656 and memory medium SODIMM coupling etc chip's constructs this system. After determination of the chip, profits from the reference and the simulation method completes the system principle design. Finally, under the full consideration signal integrity premise, adopts methods of rational distribution, optimized wiring and system simulation, gives the concrete design proposal to system's subsystem module, and completes overall system's PCB design.Based on the test criteria and the existing hardware condition, utilize FPGA tools development kit ISE and spectrum analyzer, adopts divides the module testing and the synthesis whole test unifies, the logic simulation and the actual test unify and so on, completes the test and debugging work of the high-speed data acquisition and playback system, arrives at the anticipated goal basically.At present, the high-speed data acquisition and playback system has successfully applied to spaceborne SAR handware-in-loop simulation system and made a good performance during the practice.