The Impact Of Ultra-wideband Signals In The Wear Wall Radar Applications

Taking the advantage of wide frequency band and high resolution, Ultra-Wide-Band (UWB) radar signal is widely used in target detection and imaging, and many other domains. Through-wall radar has huge potential in such areas as anti-terrorism, assist for disaster and hostage rescue, and so on, as it can realize location and imaging for the target behind the settled barrier. So this paper has combined these two aspects and made a study in Ultra-Wide-Band through-wall radar.This paper makes an analysis about the characteristics of through-wall radar and introduces several common radar signals and their own performances, in which Ultra-Wide impulse signal is primarily studied. According to the breakthrough characteristic of electromagnetic wave, a proper frequency rang has been chosen. Directed by the property of clutter in frequency and time domain, different methods are used to mitigate the clutter. As the direct wave has powerful energy in clutter, and has a serious impact on signal, this paper makes a focus on the mitigation of the direct wave. This paper mainly studies the methods to remove the direct wave including average offset method, principal component analysis and adaptive interference canceling method. The principle of these three filtering algorithms applied in Ultra-Wide-Band through-wall radar is analyzed and simulations are done respectively to prove the effectiveness. At last, the signal with clutter removed is studied in this paper, and reverse projection algorithm in coherent imaging field and triangle location technology in incoherent imaging field for the traditional radar system and the compressed sensing method for the new radar system are all studied. The principle of imaging algorithm is analyzed, and the simulation is made to study the effect of parameter estimation error on the result of imaging.