Research And Implementation Of A Millimeter Wave Radar Velocity And Range Measurement Algorithm

With the development of artificial intelligence,millimeter wave radar,as a non-contact speed measuring and ranging sensor,has been widely used in more and more fields.In the field of auto driving,it can be applied to blind area monitoring,lane change assist and collision warning.In the field of unmanned aerial vehicles,it can achieve high altitude and collision avoidance.In the security field,combining the camera can realize the real-time tracking of boundary moving target.So millimeter wave radar has wide application prospect.In recent year,since the use of radar integrated chip,millimeter wave radar basic technology and hardware technology are gradually mature,the measurement accuracy in practical application has been gradually improved.By analyzing the theory of millimeter wave radar velocity and range measurement deeply,a 24 GHz millimeter wave radar velocity and range measurement system is designed in this thesis.The main research contents are as follows.Firstly,the principle of the continuous wave velocity measurement and the principle of the velocity measurement of LFMCW,FSK,MFSK and their advantages and disadvantages are described in detail.Because MFSK has the advantages of both LFMCW and FSK,it is finally chosen as the modulation waveform of this system,and its parameters are determined according to the theoretical needs.Secondly,the principle of FFT and Chirp-Z transformation is introduced.In this paper,FFT has been first used to get the coarse value of IF signal frequency,and then Chirp-z refine spectrum to get higher accuracy frequency value to improve accuracy.The hardware and software parts have been further designed on the basis of theoretical analysis.The integrated chip,BGT24MTR11 and ADF4158 with more anti-interference and better consistency than discrete component,has been adopted to emit MFSK modulation waveform.In the software,the corresponding peripheral driver has been configured for the main chip STM32F303,and then,the distance and speed been calculated through the intermediate frequency signal analysis.Finally,the data acquisition platform of the upper computer has been designed to collect and analyze the real-time data,to realize the target distance measurement,Within 2m to 30 m,measurement error in 0.05 m,and system successfully used in automobiles.thus,verifying the system feasibility.