Reflection, Refraction, and Self-Jamming

The ambition of achieving road traffic without serious injuries, since 1997 referred to as “Vision Zero,” has influenced the development of new car generations during the last decades. Since the early beginnings, radar sensors have taken responsibility for receiving this goal and played a major role for achieving the subsequent vision of accident-free driving. An increasing list of applications already covers comfort and safety functions for various traffic conditions. Besides already established applications like adaptive cruise control (ACC) as illustrated in Figure 1, other examples are the lane change assistant (LCA), watching for traffic when starting an overtaking maneuver (see Figure 2) and cross traffic alert (CTA), warning of approaching vehicles at a junction. However, those examples are just a few of the constantly increasing list of functions [1][2].