A compact MIMO automotive radar using phase-aligned daisy-chain cascading topology and elevation compensation for 2D angle estimation  

作　　者：Rui ZHOU Jixin CHEN Yan HUANG Gang XU Debin HOU Bangjie ZHANG Zekun LI Yu XIANG Wei HONG 

机构地区：[1]State Key Laboratory of Millimeter Waves,Southeast University,Nanjing,210096,China [2]Purple Mountain Laboratories,Nanjing,210096,China [3]MiSic Microelectronics Co.,Ltd.,Nanjing,210096,China

出　　处：《Science China(Information Sciences)》2023年第6期218-237,共20页中国科学（信息科学）（英文版）

基　　金：supported in part by National Natural Science Foundation of China (Grant Nos.61901112,62271142);Natural Science Foundation of Jiangsu Province (Grant No.BK20190330);Shanghai Aerospace Science Funding (Grant No.SAST2021-043);Aeronautics Science Funding of China (Grant No.ASFC-20200020069001)。

摘　　要：To design a high-performance multiple-input multiple-output(MIMO)automotive radar system with simple hardware architecture,this study presents a daisy-chain cascading design scheme,implementing the two-dimensional(2D)nonuniform antenna array with high-gain antennas for 2D angle estimation.The improvements in the designed radar system are primarily divided into three parts.First,a daisy-chain cascading topology will cause severe phase deviations;hence,we rigorously analyzed the influence of the phase deviations and proposed a low-cost phase-alignment procedure to address this concern.Second,to obtain 2D angular resolution and a longer working range with limited channels,a novel 2D antenna array design principle facilitating the arrangement of high-gain antennas was presented.Third,a new phase compensation procedure was developed to mitigate the deterioration of angular accuracy in the elevation plane.Based on the proposed design scheme,a frequency-modulated continuous-wave(FMCW)radar prototype with two transceiver chips,i.e.,six transmitters and eight receivers,was successfully built.The prototype radar system’s performance was tested through an anechoic chamber and outdoor experiments.Consequently,an angular resolution of 3.5°in azimuth and 12.5°in elevation was featured in the anechoic chamber.Furthermore,using the 2D conventional beam-forming,the outdoor experiment captured high-resolution 2D angular estimation results,thus demonstrating the superior performance of the designed prototype system.

关 键 词：frequency-modulated continuous-wave radar prototype FMCW multiple-input-multiple-output MIMO phase-alignment daisy-chained cascading topology 2D antenna design elevation compensation 

分 类 号：TN957.51[电子电信—信号与信息处理] U463.6[电子电信—信息与通信工程]