A Research Of Lane Change Assistant Radar System

As the main means of transportation,automobiles are becoming more and more popular in people's life.With the increase of automobile ownership,the number of automobile traffic accidents remains high.How to reduce the rate of traffic accidents and reduce the traffic load has become a hotspot.As an important part of the automobile active safety system,automobile anti-collision radar can effectively improve the driving safety factor and reduce the incidence of traffic accidents.With the development of automobile driving technology and advanced safety driving technology in recent years,automobile anti-collision radar has broad prospects for development and market,which has received the attention and support of scholars and manufacturers at home and abroad.Vehicle radar mainly works in the bands of 24 GHz and 77 GHz,of which 24 GHz is mainly used as short-range radar with a detection distance of about 30 m.It has the advantages of low cost and wide coverage.FMCW radar has many advantages,such as high resolution,no blind area,mature architecture.It is the mainstream choice of vehicleborne radar design.In this paper,the auxiliary radar system for vehicle lane changing is studied,and the radar performance index is determined by analyzing the dangerous scene of vehicle lane changing,and the overall scheme design of radar system is completed according to the index.The main contents of this paper are as follows:1.Finishing the design of RF transceiver circuit.In this paper,the BGT24MTR-12 RF-transceiver chip of Infineon and ADF4158 PLL-chip of ADI are selected.The design and fabrication of RF circuit are completed by using simulation software ADS,HFSS and AD.And we obtained a transceiver front-end circuit working in the frequency band of 24 GHz.2.Finishing the design of IF conditioning circuit.According to the range of radar ranging and velocity measurement,an IF signal conditioning circuit including filtering,automatic gain control amplification and differential to single-ended function is designed,which can effectively filter and amplify the IF signal,and convert the differential signal to single-ended signal and send it to ADC for sampling.3.Finishing the design of control and signal processing circuits.The control and signal processing circuit is designed by using TI's DSP chip with floating-point operation function.The software is written and debugged on CCS platform.We realized the functions of control RF transceiver chip,PLL chip,VGA chip,and realized the functions of signal sampling and processing,the design of IF signal conditioning circuit including filtering,automatic gain amplification and port conversion is completed.4.Test.The point-frequency and sweep-frequency functions of the RF transceiver front-end are tested by spectrum analyzer.Amplification function of IF conditioning circuit is tested by simulating IF signal.The RF transceiver port is connected with delay line mode to simulate the stationary target and measure the IF signal frequency.We test the whole system after adding antenna.Because of the limited personal capacity,the design of radar system is in a hurry.There is no joint test of radar system in the field environment.It is hoped that the outfield test results will be given in the follow-up design.