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The concept of the intelligent car consists in equipping the vehicle with an optimum number of sensors such as radar, in order to perceive the environment which surrounds it, to ensure an automatic guidance control of the vehicle and to communicate with the external medium. In this paper, we propose to exploit the UWB technology for road radar applications, in order to profit from its inherent advantages (good range resolution, low power consumption, low price etc.). All exiting studies on UWB radar concerns essentially medical and military applications. The originality of this radar is its capacity to detect easily various obstacles and to give their signatures. This paper describes the used radar and presents an interesting study of the adapted UWB waveforms which allow location and signatures of different kind of obstacles detected in short ranges with a good resolution.