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Thanks to the advances of embedded signal processing, high-frequency integrated circuit (IC), and monolithic microwave IC, miniature radar systems can be realized on a printed circuit board or even on an IC [1-5]. Applications of radar systems have been extended to commercial areas, such as through-the-wall detection [6-9], indoor localization [10-13], biomedical applications [14, 15], and driver assistance [16, 17]. Radars are the key technology in the safety system of a modern vehicle. Automotive radars are the critical sensors in advanced driver-assistance systems (ADAS), which are used for adaptive cruise control, collision avoidance, blind spot detection, lane change assistance, and parking assistance. Evolving from the driver assistance system, a fully autonomous car has much higher demands for its sensors, especially for automotive radars. The topics of this book mainly focus on modern radar technology and its applications on automotive vehicles. The fundamentals of modern automotive radars, including radar system architecture, radar signal processing, noise modeling, and basic detection theorems, are introduced at the beginning by using the frequency-modulated continuous-wave (FMCW) waveform as the example. Due to the scope of this book, details of some theoretical analysis are not discussed in this book. Interested readers may refer to Reference [18] for more theoretical contents. In addition to the radar fundamentals, this book also includes the contents of advanced technologies that have been used in modern automotive radar systems, such as multiple-input and multiple-output (MIMO), sensor fusion, target classification, as well as interference detection and mitigation. These technologies are the keys for supporting ADAS and future fully autonomous vehicles.In this book, we also recognize that the future of automotive radars should not only address conventional exterior applications but also play important roles for interior applications, such as gesture sensing for human-vehicle interaction, driver/passenger vital signs and presence monitoring, etc. The readers could refer to Reference [19] for additional contents on short-range micromotion sensing with radar technology.