| Digital Beam Forming (DBF) technology is the combination of digital signalprocessing technology and antenna technology. Based on many advantages like adaptiveinterference suppression and multiple beams forming, it is the current hot research fieldof the radar signal processing.This paper completes the design of the processing platform data conversion system,which is based on DBF technology. This system is mainly used for the DBF datacollection and transmission. It is a part of the DBF signal processing platform, andworks together with the DBF signal processing system. This paper first introduces thehardware architecture of the entire platform. In the form of a carrier board and daughtercards the whole system can be more extensible and more convenient to complete the testwork. Carrier board equips with host processors of the data conversion system and thesignal processing system. The data conversion system is mainly responsible forreceiving configuration informations, and initializing the daughter cards. So the FPGAchip xc3s1600e has been chosen for this system. Because of the need of implementing alarge number of algorithms, the signal processing system chooses to use FPGA chipxc7vx690t. In the next step, this paper introduces several hardware selections on thedaughter cards. There are two kinds of daughter cards, one is used for the acquisitionand A/D conversion of the signal, and the other one is used for the transmission and D/Aconversion.After the overall system architecture and the corresponding chip selections havebeen determined, the entire system hardware circuit design is completed by usingCadence software. Then, the FPGA-based embedded Microblaze system is developedby ISE, XPS, SDK software, which provides the platform for the configuration anddebugging of the data conversion system. Various peripherals can be added in theMicroblaze system, and with these peripherals the Microblaze system completes theimplementation of the SPI and IIC bus.Finally, this paper completes the configuration of multiple daughter cards withMicroblaze embedded system, and then correlates the signal processing system for the joint debugging. The source inputs signals to the AD daughter card. After theanalog-to-digital conversion, the signals are sent into the signal processing system forfurther synchronization operations such as sampling rate conversion and filtering. Afterthat, the signals will be the input of the DA daughter cards for analog-to-digitalconversion, and ultimately analysed by the spectrum analyzer to ensure the individualmodules and subsystems are working correctly. From the final test results, the designeddata conversion system can work stably and has a good performance. |
