Algorithm Research And Algorithm Realization Of Vehicle Rada BSD System

With the prosperity of China’s market economy,cars are no longer exclusive to a few people,and more and more people have driving qualifications.Driving cars and taking cars have become a part of the lifestyle of modern people.Accompanied by this,the frequency of traffic accidents is also increasing.Among them,a large part of traffic accidents are caused by drivers in the process of driving vehicles to change lanes,overtaking,starting,overtaking and ignoring the sideand rear to the car or pedestrians.The existence of Blind spots has become a safety hazard that cannot be ignored,which threatens the safety of pedestrians,passengers and drivers.Blind Spot Detection(BSD)system can collect information of Blind spots through sensors and inform drivers of potential safety hazards,which has great research value.Based on the 77 GHz vehicle-mounted millimeter-wave radar,this thesis studies the radar algorithm involved in the BSD system,designs and improves the algorithm process,and implements the algorithm on the AWR1642 embedded platform,verifies and analyzes the feasibility of the algorithm.The main work of this thesis is as follows:Firstly,at the system design level,the functions and standards of the BSD system are sorted out based on the application scenarios and relevant national standards,and the overall architecture of the BSD system,information processing logic,algorithm flow of radar signal processing part and radar algorithm index are designed.Secondly,the waveform system of the vehicle radar is compared and studied,and the sawtooth wave linear frequency modulation signal is chosen as the radar transmitting signal,and on this basis,the algorithm of speed measurement,ranging,angle measurement and target detection is studied,and the suitable algorithm scheme is selected for the BSD system.Thirdly,combined with the possible problems in application scenarios and the software and hardware conditions of engineering development,the algorithm is improved.TDM-MIMO technology is selected and the problem of doppler phase difference caused by target movement is solved.The velocity measurement and ranging process was redesigned to solve the velocity ambiguity problem.A new target detection scheme is designed for the system,so that it can have good performance in the environment of uniform clutter,multi-target interference and clutter edge.Fourthly,the hardware structure and software architecture of AWR1642 are studied.On this basis,the software flow and signal processing flow of the BSD system are designed.The radar parameters are designed for the application scene and the algorithm implementation of the BSD system is completed by using CCS development environment.Finally,the capability of target detection,velocity measurement,distance measurement and angle measurement of the system is tested and verified.In order to simulate the use of the scene,a simple test environment was built according to the national standard,and the opening warning function of the system was tested.The test results show that the BSD system and algorithm flow designed in this paper have certain feasibility and effectiveness.