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Calibration of an antenna array is very important for high-resolution Direction-Of-Arrival (DOA) estimation. In this paper, the authors study this issue for automotive Frequency Modulated Continuous Wave (FMCW) radar whose low-cost dielectric lens antenna causes, in addition to the coupling between sensor elements and gain or phase mismatch, direction-dependent perturbations to the sensor response. They apply both global and local calibration methods and compare their performance. Automotive radar sensors are used for many driver assistance and safety systems such as Adaptive Cruise Control (ACC), lane change monitoring, brake assistant, collision warning, and prevention.
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