If Digital Receiver Technology And Systems To Achieve

One of the important conceptions of Software Radio is to make A/D converter close to antenna,we should convert IF analog signal even RF analog signal into digital signal.However,limited by the current technic level of the chip,it is difficult to realize RF signal digitalization .Thus, IF signal digitalization becomes the prevalent choice.Today,the technology of IF signal digitlization is one of technologies be in great progress of Software Radio.IF digitlized receiver has becomes one of the most important parts of radar system.Therefore,it is significant to research into and develop IF digitlized receiver.In this paper,the principle of IF digitlization and the foreground of FPGA thechnology are introduced at the first.Then we discuss the mehod to make a project in order to design a kind of IF digitlized receiver.Several issues such as system structure,sample rate,the method to develop NCO,filter designing and system synchronization are discussed.After that we discuss the mehod to turn the project into reality,the mehtod to develop Down Converter and Decimator in FPGA are mainly discussed.At last, several tests are done to evaluate the developed system.The results of the tests indicate that the system could work well and the desired requirements could be achieved.