Research On High Speed Target Ranging Technology Based On LFMCW Radar

In modern warfare,high-speed moving weapons have better penetration capabilities,and are therefore increasingly favored by the military.How to conduct early warning,search,reconnaissance and final precision strike against these high-speed sports weapon targets is a problem that needs to be solved in current military research in the radar field.In recent years,relying on the advancement of millimeter-wave devices and digital processing technology,and the seamless search characteristics of LFMCW on target time,for fuze radar systems,millimeter-wave LFMCW has an irreplaceable advantage for highspeed target search,detection and distance measurement.This thesis focuses on the algorithm and scheme design and simulation implementation of LFMCW fuze radar signal processing.At the same time,the hardware system design and implementation are completed according to the design requirements,and the system test is carried out.The main work and achievements of the thesis are as follows:?1?The principle of high-speed target ranging of LFMCW fuze radar is studied,and the phenomenon of multi-period cross-distance unit movement caused by high speed is analyzed.The problem of high-order phase of the echo is affected by the high maneuverability of the missile near the target.A moving target parameter estimation algorithm based on quadratic mixing and 3DPT is proposed to achieve the correct range of the target.The related clutter model of the background of the fuze radar is studied,and the clutter simulation is carried out according to the Weibull distribution model.Compared with the CACFAR and GOCFAR constant false alarm detection algorithms for single targets,the improved interval unit IGO-CFAR algorithm is used to achieve target detection in uniform and non-uniform clutter environments,reducing the number of reference cells and improving hardware computational efficiency..?2?According to the requirements of detection distance,target speed and resolution in actual application,the overall architecture of the system and the various system parameters of the radar system scheme are determined,and the LFMCW high-speed target clutter environment is built according to each parameter in Matlab.Ranging system simulation platform.?3?For the miniaturization and low-cost requirements of the fuze radar,the peripheral circuit design is carried out around the TRX₁20_REF radar chip,and the receiving link amplifier and ADC are analyzed and designed to ensure the reception quality and accuracy.At the same time,according to the requirements of the power supply of different chips,different power conversion circuits are designed.The RF front-end hardware design of the LFMCW fuze radar system was completed.?4?The top-down modular design of the digital baseband signal processing system is carried out by using the FPGA development method based on System Generator.The SG simulation platform is built,and the hardware co-simulation and test with the FPGA are carried out.?5?Develop a complete LFMCW radar fuze ranging system hardware platform,and carry out relevant debugging and testing.