Design And Implementation Of A Three-dimensional Visual Radar Based On Dual-beam Multi-step Frequency Shift Keying

With With the development of social economy,people pay more and more attention to urban traffic problems.Traffic accidents are caused by speeding and other illegal behaviors,and problems such as rush hour and common traffic jam emerge in big cities.The establishment of an intelligent traffic monitoring system to achieve the vehicle speed measurement,capture,imaging and vehicle flow detection is an important means of efficient traffic management.In this paper,a 3D radar based on dual-beam multi-stage frequency shift keying is designed,and the 3D radar is visualized by combining the radar information with the information collected by the camera.The main work of this paper is as follows:(1)the advantages and disadvantages of multi-frequency keying modulation waveform widely used in automotive collision prevention radar are analyzed from the modulation signal form of radar.A dual-beam multi-stage frequency shift keying is designed.The horizontal polarization beam and the vertical polarization beam are used to detect the same area together.The measurement accuracy of the range and velocity is improved by using the method of large and small frequency difference.The measurement accuracy of horizontal angle and pitch angle is improved by using the method of long and short distance.Finally,the integration of multi-lane and multi-target 3D information is realized by spectrum pairing method,and the corresponding signal processing method is given.(2)A high precision velocity estimation method for multi-lane vehicle expansion target is proposed.Through the steps of target clustering,centroid extraction,setting time sliding window and segmental straight line fitting,the real-time and high precision estimation of vehicle speed is realized.A set of corresponding track management method is given to realize the three-dimensional track tracking of multi-target vehicles.The 3D radar tracking information is fused with the information collected by the camera to realize the visualization of 3D radar.(3)Based on the XMC4500 microprocessor and BGT24MR12 RF chip of Infineon Technology Company,the hardware module of 3D radar is designed,and the software design of radar signal processing,data processing and visual control platform is completed.The outfield test results show that the range,velocity,azimuth and pitch angle of the 3D radar designed in this paper have high accuracy,stable performance and good visualization effect.