Millimeter-wave radar sensor applications have gradually expanded and are now mainly focused on automotive radar , transportation security, indoor homes, and other popular areas. Demand is also growing in other niche areas. Although both are millimeter wave radars, the processing method and focus differ in different ways. For example, in automotive radar sensors : (1) Most of the targets are cars belonging to the rigid body target, do not need to pay too much attention to the details of the target's movement information, such as wheel rotation; (2) Generally, an automobile radar needs to detect targets within 300m at the farthest, and needs to realize stable tracking of targets and estimate the direction of target movement; (3) Even in the face of pedestrians and other non-rigid targets, automotive radar does not need to pay attention to the target's specific attitude changes, such as pedestrian detection does not need to pay attention to the specific posture of the person (running, walking, falling), as long as the car is told someone and their movement direction. However, indoor radar and automobile radar sensor are significantly different. Indoor radar sensor has many scenarios, such as human presence sensing, respiratory heartbeat detection, gesture recognition, gesture recognition, fall detection, number of people, etc., as well as based on these basic functions of the expansion of the application, such as smart lights, air conditioning, TV, toilet seat and so on. In these scenarios, it is necessary to sense information about the human body or human limbs, and academics have categorized the different levels of motion on the human body into three types, as shown in Figure 1. Figure 1: Classification of Human Body Motion
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