Design And Realization Of Miniaturized Target Reflection Information Detection System

With the increasingly complex electromagnetic environment faced by modern radars and the ever-increasing demand for all-weather,multi-purpose,and intelligence,traditional radar development methods have faced bottlenecks.In the 1990 s,there was an attempt to introduce software radio technology into the field of military radars.With the maturity of software radio technology,software radar has become a current research hotspot.Compared with traditional radar development methods,software radar has the capabilities of multi-purpose,hardware reuse,reconfigurability,etc.,as well as application characteristics such as high integration,strong reliability,and miniaturization.This paper is based on the general software radio platform to carry out the key technology research of applying software radio technology to FMCW radar.This thesis is based on the hardware platform composed of AD9361 RF front-end and Zynq system-on-chip.Based on the principles of portability,modularization and standardization,the system’s software and hardware overall architecture,programmable logic,and host computer and embedding are designed through the software and hardware co-design method.Finally,the actual measurement and analysis of the system are carried out.Detailed work content includes:1.A software radar architecture based on Zynq system-on-chip and AD9361 RF front-end is designed.The signal processing procedures of the fast ramp FMCW radar are analyzed in detail,and the software and hardware co-design method is used to assign the algorithms to the software and hardware subsystems according to their characteristics.This architecture solves the engineering problems of high data throughput requirements,lack of real-time potential,and coherence between transmitting and receiving channels in other research solutions.2.Based on the principles of modularity,standardization,and portability,a hierarchical system software overall architecture is designed and various layers of software including embedded bottom-level drivers to user space programs are realized.The Zynq system-on-chip software uses the transplanted Linux operating system as the operating environment,the kernel iio subsystem as the underlying driver framework,and the libiio runtime library as the communication bridge between the host computer and the Zynq system-on-chip,which realizes the control and high-speed radio frequency frontend Data transmission and communication with the host computer.The host computer uses the libiio runtime library as the communication basis to implement follow-up algorithms including range Doppler imaging,target detection,and angle measurement.3.A overall architecture of programmable logic is designed and A modular design is realized.The programmable logic in Zynq mainly runs high-speed digital processing algorithms.It builds an overall framework with AXI and AXI-Lite standard bus protocols as the core,and implements an FMCW signal generator including a transmitting link and a receiving link for generating Custom IP core including digital down-conversion of down-sampling difference frequency signals.4.Based on the software FMCW radar realized in this paper,a series of indoor and outdoor experiments are designed,and the feasibility of the software radar designed in this paper is verified through actual measurement analysis.