Millimeter Wave Radar Short-Range Ranging System Design Based On FMCW

With the rise and development of technologies such as artificial intelligence,smart medical treatment,and unmanned driving,the accurate measurement of specific target distances and displacements plays an important role in actual industrial production.The traditional ranging methods generally have the problems of low accuracy and susceptibility to environmental influences,so a variety of "non-contact" ranging methods came into being.Among them,FMCW(Frequency Modulated Continuous Wave)radar ranging system embodies a good application prospect due to its high measurement accuracy and low environmental interference.This paper investigates and analyzes the current domestic and international application requirements for FMCW radar ranging.Combining millimeter-wave radar sensors and data processing technology,this paper designs a miniaturized,high-performance,affordable FMCW millimeter-wave radar short-range ranging system to solve the traditional radar ranging system's low integration,complex structure,and expensive price And other issues.The main research work is as follows:(1)Through the comparative analysis of multiple radar sensor parameters,the Texas Instruments AWR1443 chip was selected as the system millimeter wave radar sensor main chip.Determine the overall scheme of the system according to the sensor selection,and analyze and study the basic principles of FMCW radar ranging and dielectric lens antenna.(2)Determine the system hardware plan,design the peripheral circuit of the millimeter wave radar sensor chip,and complete the PCB design and processing.(3)The processing algorithm of radar difference frequency signal is studied,and the ranging accuracy of FFT(Fast Fourier Transform)algorithm and CZT(Chirp Z-transform)algorithm is tested and compared in MATLAB.Based on this,an improved FFT?DTFT?CZT algorithm is proposed.Experimental results show that the algorithm significantly improves the spectral resolution and ranging accuracy.(4)Completed the construction of the system test platform and the design of the system GUI display interface.After debugging,the distance accuracy test was carried out.The test results showed that: the system is within the range of 0.5 ? 12 m,the ranging error is 10 mm,and the accuracy is 0.083%;within the range of 12 ? 25 m,the ranging error is 54 mm,and the accuracy is 0.216%.When the system test distance is far(12 ? 25m),it is proposed to increase the signal-to-noise ratio by adding a dielectric lens,reduce the system's ranging error to 37 mm,and make the system's ranging accuracy reach 0.148%.