Calibration of Motional Frequency Spread for Wide-Band FMCW Automotive Millimeter-Wave Radar

IEEE Access

Yang Li¹  Haiming Wang¹  Yongming Huang¹  Cheng Zhang¹  Yuqin Gong¹  Mengde Cao¹ 

[1] School of Information Science and Engineering, Southeast University, Nanjing, China;

关键词: Automotive radar;    calibration;    frequency spread;    millimeter-wave;    wide-band FMCW;   

DOI  :  10.1109/ACCESS.2020.2966222

来源: DOAJ

【 摘 要 】

As a key module for self-driving cars and advanced driver assistant systems (ADAS), frequency modulation continuous wave (FMCW) automotive millimeter-wave (mmwave) radar has a good market prospect. Due to the relative motion of target and radar in the detection window, the motional frequency spread is inevitable especially for wide-band FMCW automotive mmwave radar systems with large bandwidth and possible high-speed motion. In this paper, for wide-band FMCW automotive mmwave radar systems, we first derive analytical expressions of the motional frequency interference term and phase interference term in the intermediate frequency (IF) signal. Then, the effect of frequency spread is comprehensively analyzed with the help of numerical results. Motivated by the mechanism and influence of frequency spread, we propose three schemes for motional frequency spread calibration with different performance-complexity tradeoff. Finally, simulations verify that the proposed schemes can effectively compensate the degradation of system resolution and parameter estimation accuracy due to frequency spread.

【 授权许可】

Unknown