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

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...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.14355-14366
Main Authors: Zhang, Cheng, Cao, Mengde, Gong, Yuqin, Li, Yang, Huang, Yongming, Wang, Haiming
Format: Article
Language:English
Subjects:
Automotive engineering
Automotive radar
Autonomous cars
Bandwidths
Calibration
Continuous radiation
Doppler effect
Doppler radar
Drivers
Frequency modulation
frequency spread
Interference
Intermediate frequencies
Millimeter waves
millimeter-wave
Parameter estimation
Radar detection
Radar equipment
Radar systems
Time-frequency analysis
wide-band FMCW
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Summary: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.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2966222