A UWB microwave imaging radar system for a small target detection

An ultra-wide band (UWB) radar system to detect a small target is proposed. A three-dimensional target model is used in the investigations. A circular array with UWB coplanar waveguide (CPW)-fed bow-tie slot antennas is used in the radar system. The transmitting antenna is excited by the impulse waveform while the other antennas are used as the receivers, i.e., a single transmitter and multi- receivers. This system provides wide angular coverage in both elevation and azimuth plane at receiver side. By using a simple delay-and-sum (DAS) beamforming method, a synthetic focal point is created and a high resolution image can be reconstructed from the backscatter signals. From the simulation results, the position of image agrees with that of the target.