The launch of unmanned models and the introduction of laws and regulations will promote the development of the autopilot industry. The greatest characteristic of millimeter-wave radar is its strong penetration, which can be used in harsh conditions such as rain, snow and heavy fog. It is an indispensable feature for future autopilot. According to the radar band, millimeter-wave radar is divided into 24GHz millimeter-wave radar and 77GHz millimeter-wave radar. 77GHz millimeter-wave radars will be the future development direction due to its farther detection range. Digital Beamforming (DBF) is a new technology that combines the principle of antenna beam forming with digital signal processing technology. At present, DBF is widely used in automotive 77GHz millimeter-wave radar. In this paper, the basic principle of DBF was explained firstly and then the method of amplitude and phase calibration of DBF weight coefficient in engineering was described. Finally the static and dynamic detection effects of automobile millimeter-wave radar based on DBF technology were given.
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