Giroto de Oliveira Lucas, Antes Theresa, Nuss Benjamin, Bekker Elizabeth, Bhutani Akanksha, Diewald Axel, Alabd Mohamad Basim, Li Yueheng, Pauli Mario, Zwick Thomas
Institute of Radio Frequency Engineering and Electronics (IHE), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany.
Sensors (Basel). 2022 Apr 22;22(9):3212. doi: 10.3390/s22093212.
In the context of all-digital radar systems, phase-modulated continuous wave (PMCW) based on pseudorandom binary sequences (PRBSs) appears to be a prominent candidate modulation scheme for applications such as autonomous driving. Among the reasons for its candidacy are its simplified transmitter architecture and lower linearity requirements (e.g., compared to orthogonal-frequency division multiplexing radars), as well as its high velocity unambiguity and multiple-input multiple-output operation capability, all of which are characteristic of digital radars. For appropriate operation of a PMCW radar, choosing a PRBS whose periodic autocorrelation function (PACF) has low sidelobes and high robustness to Doppler shifts is paramount. In this sense, this article performs an analysis of Doppler shift tolerance of the PACFs of typically adopted PRBSs in PMCW radar systems supported by simulation and measurement results. To accurately measure the Doppler-shift-induced degradation of PACFs, peak power loss ratio (PPLR), peak sidelobe level ratio (PSLR), and integrated-sidelobe level ratio (ISLR) were used as metrics. Furthermore, to account for effects on targets whose ranges are not multiples of the range resolution, oversampled PACFs are analyzed.
在全数字雷达系统的背景下，基于伪随机二进制序列（PRBS）的相位调制连续波（PMCW）似乎是自动驾驶等应用中一种突出的候选调制方案。其成为候选方案的原因包括其简化的发射机架构和较低的线性要求（例如，与正交频分复用雷达相比），以及其高速度无模糊度和多输入多输出操作能力，所有这些都是数字雷达的特性。对于PMCW雷达的正常运行，选择一个其周期自相关函数（PACF）具有低旁瓣且对多普勒频移具有高鲁棒性的PRBS至关重要。从这个意义上讲，本文通过仿真和测量结果对PMCW雷达系统中典型采用的PRBS的PACF的多普勒频移容限进行了分析。为了准确测量多普勒频移引起的PACF退化，使用峰值功率损失率（PPLR）、峰值旁瓣电平比（PSLR）和积分旁瓣电平比（ISLR）作为指标。此外，为了考虑对距离不是距离分辨率倍数的目标的影响，对过采样的PACF进行了分析。
