| With the development of radar technology,the application range of radar has become wider and wider.In the 1960 s,the field of automobile collision avoidance has gradually begun to research radar technology.More and more cars will install anti-collision radar.Due to the year-on-year increase in the use of automobile collision avoidance radar,the single signal waveform,and the limitation of the available frequency band of the automobile collision avoidance radar system,the automobile collision avoidance radar system between different vehicles will produce cross interference,and the automobile collision avoidance radar system will It will cause misjudgments and endanger people’s safety.The cross-interference problem caused by automobile anti-collision radar has gradually attracted people’s attention.Therefore,the design and processing of radar signals is of great significance.In order to improve the accuracy of automobile anti-collision radar and its anti-interference ability,the following research is carried out in this thesis.This thesis first introduces the current research status of millimeter wave automobile collision avoidance radar cross interference,discusses the signal waveform form of automobile collision avoidance radar,and the safe distance that the vehicle should maintain while driving.Secondly,formulate the formulas of the existing FMCW(Frequency Modulating Continue Wave),MFSK(Multiple Frequency Shift Keying),PMCW(Phase Modulating Continue Wave)automotive collision avoidance radar signal forms,and measure the above several systems.The range speed measurement is simulated,and the obtained radar difference frequency signal is analyzed,and then the carrier frequency disturbance,bandwidth disturbance and noise are added on the basis of previous research,and the anti-jamming technology of the existing automobile collision avoidance radar is analyzed again.And simulation,discussed the interference problem between the automobile anti-collision radar system,studied the method of suppressing the interference,and designed the signal processing plan of the anti-interference signal.Finally,by studying the method of suppressing interference and the design and processing plan of anti-interference signal,the LFM-OFDM combined waveform anti-radar cross-interference processing method is analyzed and studied.Based on the LFM-OFDM waveform,the adaptive beamforming method is used to suppress the interference.According to the simulation results,we can see This method can effectively suppress the interference between automobile collision avoidance radars,improve the resolution of targets,and improve the detection accuracy of target speed and distance.This method has a wide application prospect in the field of automobile collision avoidance radars. |
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