Millimeter-wave radar has all weather and all day work characteristics, and detection distance, high detection accuracy. In the vehicle to the target detection system, play an important role. At the same time, the integration of visual and laser modules and the construction of ADAS system has gradually become a new development direction for active safety of automobiles. Long Range Radar (LLR) with ranging and anti-collision function, widely used in automotive automatic cruise control (ACC), forward collision warning (FCW), automatic emergency braking (AEB) and other fields.