Design And Implementation Of Radio Frequency Signal Recording And Playback System

Radio frequency recording and playback system is widely used in radar,communication,satellite,navigation,electronic countermeasures and other fields.It is an important test instrument to test and evaluate the performance of related electronic equipment.According to the development trend at home and abroad,the relevant design and implementation of RF signal recording and playback system have been carried out,which has important research significance and practical application value.On the basis of researching the development trend and trend of radio frequency signal recording and playback system,this paper designs the system scheme based on FPGA based on chip programmable system.The RF input signal of the front end is demodulated into two orthogonal analog baseband signals through the orthogonal demodulation module,and the analog baseband signal is converted to the digital baseband by the broadband analog to digital converter under the control of FPGA.By studying the AXI bus technology,multi port memory control technology,FPAG high speed interface technology and Zero intermediate frequency transceiver architecture theory,the DMA transmission control is completed by embedded software,which has realized effectively the real-time transmission,caching and reliable storage of high speed baseband data.Under the control of embedded software,the storage data is read and transmitted through the optical fiber interface.The digital baseband data is converted to radio frequency signal by digital analog conversion and orthogonal modulating module,which has realized the replay of the radio frequency.At the end of this paper,the principle of system test verification is expounded.Through the software testing method,the RF front-end configuration interface,the key module of the RF front end,the LVDS baseband reception interface,the LVDS baseband transmission interface and the optical fiber interface communication module are verified.Using vector signal generator and spectrum analysis equipment to test the basic function of the whole system,the feasibility of the design scheme is validated effectively.The system can realize the basic function of radio frequency signal recording and replaying.