FMCW microwave collision avoidance Radar is key technology in ITS (Intelligent Transform System). There is a boom going on in microwave and millimeter wave applications of products in the field of autonomous intelligent cruise control (ACC) and collision warning (CW)/collision reduction (CR) radar systems for in-vehicle applications. Use of these technologies provides greater public safety and convenience for lower cost than simply building more roads. In this papers, we have a general research