| With its origination in the military,radar technology has gradually permeated into people's livelihood,intelligence,and a new era of multi-sensor fusion.The77 GHz millimeter wave radar,characterized by wide bandwidth,narrow beam,strong penetrating power,high-precision detection,has gradually replaced the 24 GHz radar to be an indispensable sensor in many fields such as ADAS(Advanced Driving Assistance System)and traffic safety.The advent of the millimeter wave radar single-chip solution and the continuous reformation of PCB(Printed Circuit Board)technology,serves to avoid building the complex traditional radar systems;meanwhile,the radar antenna can be integrated on the PCB due to the improvement of PCB precision,and a more targeted design of radar system with flexibility is thereby achieved.This study is committed to providing a reference design for ADAS application by designing an embedded millimeter wave radar system based on Texas Instruments(TI)'s AWR1642 device.The design discussed in this study is shown as follows:1.Designing the millimeter wave radar hardware system for the AWR1642 device.Based on the reference scheme of TI's AWR1642 BOOST,the source circuit configuration,power interface circuit and some functional circuits are redesigned;the USB(Universal Serial Bus)interface is dedicated to transmitting two-way Uart(Universal Asynchronous Reciever/Transmitter),and the radar system gets connected to the computer from the two-way Uart to USB module with the FT2232 D device as the core.At the same time,designing a high-performance switching structure between GCPW(grounded-plane coplanar waveguide)and microstrip line.2.The requirements of ADAS application are analyzed to determine the goals in designing the PCB radar antenna.The theoretical calculation and HFSS modeling and simulation serve to determine the geometric size of the patch antennas.According to the synthesis method of Chebyshev filtering functions,the 1×10 series-fed microstrip array antenna is designed,all the geometric dimensions and performance indicators of which are determined through HFSS modeling and simulation optimization.3.The source circuit test board designed herein is applied to test the voltage,limiting current,efficiency and ripple wave of each power supply.In addition,a comprehensive test is carried out to analyze the radar field of view through the measurement of the diagonal board on the PCB at various angles.Furthermore,the performance of the radar antenna is analyzed by observing the scene of the equivalent lab diagonal board test to the radar equation and the scene of the outdoor car test,coupled with the measured data analysis.The test results show that the embedded millimeter wave radar system designed in this study meets the requirements of ADAS application. |
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