Abstract: The UWB(Ultra Wide-band) technique is introduced into the Anti-collision radar.The requirement to UWB transmission signal is presented first,followed with a whole system block diagram and detailed explanation.Then,the PCI7300 A card is used to acquire the radar echoes,and the signal is processed in time domain,focused on targets identification and false targets elimination.Because of the specific environment for car anti-collision,only moving target is detected,which decreases the difficulty for signal processing and improves the update rate for imaging.