汽车雷达多域联合调制波形

Multi domain joint modulation waveform for automotive radar

针对汽车雷达时分复用(time-division multiplexing,TDM)多输入多输出(multiple-input multiple-output,MIMO)波形中存在的时间空间利用率低及高速目标多普勒模糊等问题,提出一种多域联合调制的汽车雷达波形。该波形在时域上进行脉冲重复间隔参差抖动,利用奇偶序列之间相位差实现速度解模糊,在频域和空域上通过多天线间的多普勒频率调制实现波形正交,提高了时间空间发射效率。仿真实验及基于汽车雷达波形验证系统的实测结果均验证了所提波形的有效性,与传统TDM-MIMO波形对比,所提波形具有更大的不模糊测速范围和相参积累增益,不仅对汽车雷达工程实践具有较强的应用价值,而且对低成本导引或防撞探测系统同样具有指导意义。

In view of the problems of low time-space utilization and Doppler ambiguity of high-speed targets in time division multiplexing(TDM)multiple input multiple output(MIMO)waveforms of automotive radar,a multi domain jointly modulated automotive radar waveform is proposed.The waveform is jittered with pulse repetition intervals in the time domain,so that the phase difference between odd and even sequences can be used to realize velocity ambiguity resolution.In frequency and spatial domain,the waveform orthogonality is achieved by Doppler frequency modulation,which improves the transmission efficiency in time and space.The effectiveness of the proposed waveform is verified by simulation and experimental results based on the automotive radar waveform verification system.Compared with the traditional TDM-MIMO waveform,this waveform has a larger unambiguous velocity range and coherent accumulation gain.The waveform not only has strong application value for automotive radar engineering practice,but also has guiding significance for low-cost guidance or collision avoidance detection systems.