基于 RM 核函数的毫米波雷达非视距目标稀疏成像方法
Journal: 空天科技 DOI: 10.12238/ast.v1i1.13700
Abstract
毫米波雷达成像因具备波长短、分辨率高、功耗低等优势，在全天时全天候的复杂城市环境感知中有重要的应用前景。然而，毫米波雷达成像技术如将压缩感知稀疏成像方法直接应用于NLOS场景，会出现数据计算量大和硬件存储需求高等问题。针对非视距目标稀疏成像方法中时间和空间复杂度高的问题，该研究提出了一种基于RM核函数的毫米波雷达非视距目标稀疏成像方法。首先，通过非视距三维典型场景下成像几何模型，建立非视距回波信号模型，并推导了非视距成像的理论分辨率；其次，通过初步二维成像获取建筑布局先验信息，并利用基于RM核函数的快速迭代阈值收缩成像算法完成了非视距目标成像和位置校正；最后，介绍了1比特量化技术，并分析其对非视距成像带来的影响。实际实验分析了所提算法的成像性能，结果表明，所提算法相较于正交匹配追踪算法，在保证成像质量的同时可以大大缩短成像时间。此外，所提算法利用1比特量化的回波数据可实现对非视距目标的有效成像，显著降低数据存储和传输成本。
Keywords
非视距成像；毫米波雷达；RM核函数；压缩感知；1比特量化
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