Design And Implementation Of Data Transmission System Based On Software Defined Radio

With the introduction and verification of the smart rocket theory,the basic structure of my country’s aerospace electronic measurement system has undergone a fundamental change.The original "one model,one solution" has gradually changed to a general modular design,and the test system in the arrow has also become a backbone area cable connection and a sub-area self-organizing network design,in which the modular universal radio transceiver module plays a decisive role.This subject is based on the modular reusability design of the wireless transmission system and implements a data transmission system based on software radio,which can meet the modular application of different occasions,the data transmission rate,modulation and demodulation of the radio frequency receiving module and the transmitting module Various parameters such as baseband signal processing methods,sampling rate,and operating frequency can be dynamically configured,which is of great significance.First of all,in order to realize the universal design of the radio frequency board,the radio frequency part adopts the radio frequency agile transceiver AD9363 produced by ADI.Its sampling rate,filter coefficient and other internal parameters can be configured through the SPI interface,and the frequency range is modified by software It can reach 70MHz～6GHz,and the extremely wide frequency band provides great flexibility for different occasions.At the same time,in order to match the frequency band range of AD9363,an ultra-wideband balun is selected for the RF front end.In order to achieve high-speed baseband signal processing while taking into account the reconfigurability of the baseband processing algorithm,the main control chip adopts the Zynq-7000 series chip of Xilinx’s new generation ARM+FPGA heterogeneous architecture,which can dynamically configure the PL end program through the PS end.In this way,the baseband processing algorithm is changed.Secondly,the baseband data processing algorithm of the radio frequency transmitting module and the radio frequency receiving module are respectively analyzed theoretically and the baseband processing algorithm is simulated and verified by MATLAB,and then the algorithm is implemented on FPGA using hardware description language and high-level synthesis tools.Finally,a software-based radio data transmission platform was built and a test plan was developed.The data was analyzed through spectrum analyzer testing and internal data captured by an online logic analyzer,and the system’s radio frequency data reception and transmission were verified.The test results show that the system designed in this subject can realize data transmission and reception and change the system parameters during transmission by modifying the configuration.It is in good working condition and has certain engineering application value.