Velocity ambiguity resolution for wideband automotive millimeter wave radar: a carrier frequency multiplexing framework

Cheng Zhang, Mengde Cao, Yang Li, Yuqin Gong and Yongming Huang

Journal of Electromagnetic Waves and Applications, 2020, vol. 34, issue 3, 375-389

Abstract: Wideband millimeter-wave (mmWave) radars perform sensing for automotive applications. For the velocity ambiguity in automotive mmWave radars, a resolution scheme is proposed via exploiting carrier frequency multiplexing. Compared with conventional auxiliary signal-based schemes, the proposed scheme only needs one set of main frequency modulated continuous wave (FMCW) signal. After collecting a part of the main signal as the sub-signal, the ambiguity is resolved via using the carrier-frequency difference between these two signals, resulting in higher time utilization efficiency. Meanwhile, the target information from the main signal is utilized to calculate the discrete Fourier transform (DFT) coefficient and a two-dimensional DFT is performed on the sub-signal for the ambiguity resolution. Thus, the procedures including fast Fourier transform (FFT), detection and estimation for the auxiliary signal in conventional schemes are avoided, which reduces the computational complexity. Simulations verify the effectiveness of the proposed scheme.

Date: 2020
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DOI: 10.1080/09205071.2020.1713226

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