Research On DSP-based Networkable LFMCW Radar Signal Processing Algorithm And Hardware Design

The application of millimeter wave radar in the perimeter security and civilian fields has gradually occupied an important position.While ensuring high radar performance,reducing the development cost of radar systems has become the focus of attention.Through the cooperation of radar networking technology and the cooperation of radars in the network,it can make up for the insufficient performance of a single radar and expand the detection range of the system,while reducing the development cost and improving system performance.Based on the design concept of networkable and low cost,combined with the characteristics of the simple structure of the linear frequency modulation continuous wave radar and the absence of range dead zone,this paper uses TI TMS320F28379 D DSP as the core of system control and signal processing to design the networkable sawtooth wave.The structure and scheme of the LFMCW(Linear Frequency Modulated Continuous Wave)perimeter radar system completed the hardware platform design and software implementation of a single radar,and realized a low cost and low power radar system.The design of the sawtooth LFMCW radar system is divided into the following four parts.The first part introduces the networking technology and the principle of LFMCW radar,and provides a theoretical basis for system design.By establishing a mathematical model of the echo differential frequency signal,the principle of speed and range measurement is analyzed and the relevant formulas are derived,and the feasibility of using the distance and velocity dimension FFT algorithm to solve the distance-velocity coupling phenomenon of FMCW radar is explained.Aiming at the problem of reduced radar detection performance in an interference environment,moving target display and detection and constant false alarm detection technology were used to extract the distance and speed of moving targets,and MATLAB simulation and verification were performed.In the second part,the hardware scheme of the radar system is designed according to actual needs.Design the functional modules around TMS320F28379 D,including chip selection and schematic drawing of power system,memory module,clock module,analog waveform conditioning module,communication module,etc.,and put forward requirements for the design and implementation of PCB.The third part gives the flow and scheme of the system control and signal processing software implementation,including the control of the transmitted waveform,the acquisition of echo signals,the signal processing algorithm,and the communication with the host computer.The fourth part is the hardware system debugging and field test.The function debugging results of the power supply module,clock system and memory module are given to ensure the correctness of the hardware circuit design.Through the joint debugging of the host computer,the radar front-end and the signal processing board,the waveform control,data acquisition,and communication modules are tested to realize the communication between the host computer and the radar system,the DSP's control of the transmitted waveform parameters,and the four echo differential frequency signals The functions of synchronous acquisition and data storage are tested,and the radar performance is tested by field experiments.Based on the theoretical research of the linear frequency modulation continuous wave radar signal processing method,this paper develops a networkable sawtooth wave LFMCW perimeter radar hardware system with DSP as the core,and debugs each functional module of the system.The design of the platform meets the requirements of low cost and low power consumption,and provides a basis for the subsequent implementation of the radar networking system.