基于77 GHz 调频连续波雷达,提出了一种在非视域环境下利用电磁波的多径效应从而实现人体目标检测的方法。首先,建立一个多径传播模型,并通过深入分析该模型,提出了一种有效的二维坐标点云生成方法。为了提高波达方向的测量精度,并满足实时性要求,提出了一种基于最小方差无畸变的改进方法来估计目标的波达方向,这一方法通过迭代求逆运算,显著地降低了运算复杂度。然后,针对多余的静止杂波,引入了主成分分析的杂波抑制手段,通过对回波数据的主成分分析,滤除了第一个主成分并重构数据,以达到杂波抑制的效果。最后,实验结果表明,所提方法可以准确地检测雷达视线外的目标。这一研究为未来的雷达技术应用提供了新的思路和技术支持,特别是在安全监控和自动驾驶等领域。

A method for human target detection is proposed based on 77 GHz frequency modulated continuous wave radar, which utilizes the multipath effect of electromagnetic waves in non-line of sight environments. First, a multipath propagation model is established, and an effective method for generating two-dimensional coordinate point clouds is proposed through in-depth analysis of the model. In order to improve the accuracy of direction of arrival measurement and meet real-time requirements, an improved method based on minimum variance distortionless response is proposed to estimate the direction of arrival of the target. This method significantly reduces the computational complexity through iterative inverse operations. Then, in order to suppress excess stationary clutter, the clutter suppression method of principal component analysis is introduced. By performing principal component analysis on the echo data, the first principal component is filtered out and the data is reconstructed to achieve the effect of clutter suppression. Finally, the experimental results indicate that the proposed method can accurately detect targets outside the radar line of sight. This research provides new ideas and technical support for future radar technology applications, especially in fields such as safety monitoring and autonomous driving.

TN958.94

国家自然科学基金资助项目(61561010);广西创新驱动发展专项资助项目(桂AA21077008);广西无线宽带通信与信号处理重点实验室2022 年主任基金资助项目(GXKL06220102,GXKL06220108);八桂学者专项经费资助项目(2019A51);桂林电子科技大学研究生教育创新计划资助项目( 2022YXW07、2022YCXS080);广西研究生教育创新计划资助项目(YCSW2023317)