Orthogonal Frequency Division Multiplexing (OFDM) technique is obtained significant attention in radar applications for its interference resilience property. In this paper, Fractional Fourier Transformation (FRFT) and phase analysis techniques are proposed to enhance ranging accuracy of an OFDM Radar. A proof-of-concept radar is built and tested at 79 GHz and a range accuracy of $20~\mu \text{m}$ at 5 MHz measurement rate was measured. The range accuracy is 500 times higher than using fast Fourier transformation (FFT) method.

中文翻译：

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使用分数傅立叶变换和相位分析技术提高 OFDM 雷达测距精度

正交频分复用 (OFDM) 技术因其抗干扰特性而在雷达应用中受到极大关注。在本文中，提出了分数傅里叶变换 (FRFT) 和相位分析技术来提高 OFDM 雷达的测距精度。概念验证雷达在 79 GHz 频率下构建和测试，范围精度为 $20~\mu \text{m}$ 测量速率为 5 MHz。距离精度比使用快速傅立叶变换 (FFT) 方法高 500 倍。