摘 要：TDM MIMO 技术可以扩大雷达的虚拟孔径，提高角度分辨率，TDM MIMO 因便于实现而广泛应用在汽车雷达上。TDM MIMO 因分时发射使不模糊速度范围大幅度降低，通常采用多种速度模糊阶数假设和角度维FFT 峰值比较的方法来确定模糊阶数，但该方法严重依赖于FFT 运算，效率较低。通过采用基于重叠天线的收发阵列设计和利用重叠相位差来确定速度模糊阶数的方法，规避了大量FFT 运算，降低了系统处理负载，适合车载毫米波雷达应用。
关键词：TDM MIMO；LFMCW；重叠天线；重叠相位差；速度模糊
DOI:10.19850/j.cnki.2096-4706.2021.21.018
中图分类号：TN958 文献标识码：A 文章编号：2096-4706（2021）21-0069-05
A Velocity Ambiguity Resolution Method for TDM MIMO Radar Based on Overlapped Antennas
JIANG Yinghuai
(1.Beijing Branch of WHST Co., Ltd., Beijing 100053, China; 2.Hebei Sensortech Technology Co., Ltd., Shijiazhuang 050200, China;3.Hebei Millimeter Wave Radar Sensor Technology Innovation Center, Shijiazhuang 050200, China; 4.Shijiazhuang Millimeter Wave Laser Radar Technology Innovation Center, Shijiazhuang 050200, China)
Abstract: TDM MIMO technology can expand the virtual aperture of radar and improve the angular resolution. TDM MIMO is widely used in automotive radar because it is easy to realize. TDM MIMO greatly reduces the unambiguous velocity range due to timesharing transmission. A variety of velocity ambiguity order assumptions and angle dimension FFT peak comparison methods are usually used to determine the ambiguity order, but this method heavily depends on FFT operation and has low efficiency. By adopting the design of transceiver array based on overlapped antenna and the method of using overlapping phase difference to determine the velocity ambiguity order, a large number of FFT operations are avoided and the processing load of the system is reduced, which is suitable for the application of vehicle mounted millimeter wave radar.
Keywords: TDM MIMO; LFMCW; overlapped antenna; overlapped phase difference; velocity ambiguity
参考文献：
[1] SUN S Q，PETROPULU A P，POOR H V. MIMO Radar for Advanced Driver-Assistance Systems and Autonomous Driving：Advantages and Challenges [J].IEEE Signal Processing Magazine，2020，37（4）：98-117.
[2] 张伟，何子述，李军. MIMO 雷达稀疏阵优化设计 [J].系统工程与电子技术，2013，35（2）：299-303.
[3] 王布宏，程天昊，李夏，等. 混合MIMO 相控阵雷达的交错稀疏阵列设计 [J]. 控制与决策，2021，36（4）：959-966.
[4] YAO A. 基于AWR1642 汽车雷达的速度扩展算法研究 [EB/OL].[2021-06-09].https：//www.ti.com.cn/cn/lit/an/zhca901/zhca901. pdf.
[5] ZWANETSKI A，ROHLING H. Continuous wave MIMO radar based on time division multiplexing [C]//2012 13th International Radar Symposium.Waesaw：IEEE，2012：119-121.
[6] 丁鹭飞，耿富录. 雷达原理：第3 版 [M]. 西安：西安电子科技大学出版社，2014.
[7] 邹林，黄述康，钱璐，等.LFMCW 车载雷达解速度模糊测角新方法 [J]. 电子科技大学学报，2020，49（6）：801-805.
[8] RAO S. Application Report：MIMO Radar [EB/OL].[2021-06-09].https：//www.ti.com.cn/cn/lit/an/swra554a/swra554a.pdf.
[9] 陈伯孝. 现代雷达系统分析与设计 [M]. 西安：西安电子科技大学出版社，2016.
[10] 林沂，孙占山，郭敏，等. 基于参考阵元的TDM MIMOFMCW 雷达运动补偿方法 [J]. 电波科学学报，2020，35（4）：523-530.
作者简介：江应怀（1 9 8 6 . 0 5—），男，汉族，湖北黄冈人，工程师，硕士研究生，研究方向：雷达信号处理、车载雷达系统。