Radar Imaging Sidelobe Suppression Technology

The development of modern weapon and microwave remote sensing technology requires the radars have better performance. Being a high resolution imaging radar, the SAR can get high quality radar image similar with optical photography. As they can detect and penetrate the foliage and ground, the UWB signal radars have caused more and more concern in both military and business field. Random noise radars have been researched extensively over the past years as they account for their attractive LPI (low probability of intercept) and EMC (electro magnetic compatibility). It is a general trend to combine the random noise technology and the UWB imaging technology.When applied in airborne imaging surveillance, UWB random noise radars have their special merits. Because of the randomness and the ultra wide bandwidth of the transmit and receive signals, such radars can be used for covert detection and identification, and are immune from hostile detection and jamming while preserving very high range resolution. However, the images are plagued with artifacts caused by high range sidelobes. In this paper, a new technique for the range sidelobe suppression of UWB random noise radar, which combines median and apodization filtering, is proposed. Computational and experimental results show the effectiveness of this image enhancement procedure.For more research, this paper also make some simulations of the random signal sidelobe suppression with noise background, the weak signal object detecting problem and the sidelobe suppression of 2-D radar imaging.