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arXiv 2010.04085eess.SPeess.IV
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位移传感器汽车雷达成像

Displaced Sensor Automotive Radar Imaging

Guohua Wang, Kumar Vijay Mishra

摘要:

位移汽车传感器成像利用从多个雷达单元获取的数据的联合处理,每个雷达单元可能具有有限的单独资源,以提高定位精度。现有的工作要么考虑传感器之间的完美同步,采用单天线雷达,需要高的处理成本,或缺乏性能分析。与这些工作相反,我们开发了一个位移的多输入多输出(MIMO)调频连续波(FMCW)雷达信号模型下的粗同步,只有帧级对齐。我们推导出常见的汽车雷达处理模式,如基于点云的融合以及基于原始信号的非相干和相干成像的贝叶斯性能界限。对于非相干模式,它提供了一个低计算负荷和改进的本地化之间的妥协,我们利用块稀疏的距离轮廓信号重建,以避免直接计算成像与大量的数据。对于高分辨率相干成像,我们开发了一种方法,自动估计同步误差,并利用稀疏驱动的恢复模型进行位移雷达成像。我们广泛的数值实验证明了这些优点。我们提出的位移MIMO FMCW雷达的非相干处理提高了位置估计的顺序比传统的点云融合。

英文摘要:

Displaced automotive sensor imaging exploits joint processing of the data acquired from multiple radar units, each of which may have limited individual resources, to enhance the localization accuracy. Prior works either consider perfect synchronization among the sensors, employ single antenna radars, entail high processing cost, or lack performance analyses. Contrary to these works, we develop a displaced multiple-input multiple-output (MIMO) frequency-modulated continuous-wave (FMCW) radar signal model under coarse synchronization with only frame-level alignment. We derive Bayesian performance bounds for the common automotive radar processing modes such as point-cloud-based fusion as well as raw-signal-based non-coherent and coherent imaging. For the non-coherent mode, which offers a compromise between low computational load and improved localization, we exploit the block sparsity of range profiles for signal reconstruction to avoid direct computational imaging with massive data. For the high-resolution coherent imaging, we develop a method that automatically estimates the synchronization error and performs displaced radar imaging by exploiting sparsity-driven recovery models. Our extensive numerical experiments demonstrate these advantages. Our proposed non-coherent processing of displaced MIMO FMCW radars improves position estimation by an order over the conventional point-cloud fusion.

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