FMCW Joint Communication Radar Research On Vehicle

With the development of the data era,the concept of intelligent transportation system has entered the public vision,and cars need to have both the functions of information communication and radar detection.With the loading of unmanned driving,on-board information and entertainment equipment,the requirements of power consumption,volume and electromagnetic compatibility of electronic equipment are gradually improved.The integration of vehicle and sensor can effectively aleviate these problems and make the Internet of vehicles system more intelligent.Therefore,this paper will combine the current mainstream vehicle radar FMCW system and Chirp spread spectrum communication technology to study the integrated waveform design of FMCW,coherent processing under the integrated mode,as well as the hardware implementation of the integrated system.The main contents are summarized as follows:1.This paper expounds the research background and significance of radar communication integration system,analyzes the current research status of radar communication integration technology at home and abroad,focuses on the integration research progress under the FMCW common waveform,and finally analyzes the advantages and disadvantages of various integration modes.2.Introduces the current vehicle FMCW radar target detection technology and Chirp spread spectrum communication modulation and demodulation technology,including LORA and DM-Chirp,and analyzes the performance of various algorithms through simulation.Finally,the architecture of the integrated radar communication system is given.3.Currently commonly used vehicle radars do not have communication function.In order to achieve the function of integrated radar communication without affecting the radar performance,a DM-FMCW integrated system which is easy to implement is designed,and the modulation process and processing scheme of integrated signals are introduced in detail.Then the feasibility of the integrated scheme was verified by MATLAB simulation.The DMFMCW integrated system was built by USRP software radio platform,and the performance of the integrated system was tested by experiments.4.In view of the multipath and Doppler problems existing in practical vehicle applications,in view of Lo Ra’s low power consumption and anti-fading characteristics,the FMCW radar communication integrated system based on frequency shift keying is studied,which can be compatible with common FMCW radar system.However,due to the influence of communication modulation on the radar signal frequency,the phase jump occurs during coherent accumulation,which leads to the performance loss of coherent accumulation of echo signals.In this paper,the correlation between the performance loss of coherent accumulation and frequency modulation is analyzed theoretically,and then the performance loss caused by frequency modulation is reduced by modifying the kernel function of Fourier transform.Finally,the source and influence degree of residual performance loss of the method are analyzed,and the feasibility of the method is verified by simulation.