Time-Delay and Amplitude Modified BP Imaging Algorithm of Multiple Targets for UWB Through-the-Wall Radar Imaging
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초록
In order to solve the undetected probability of multiple targets in ultra-wideband (UWB) through-the-wallradar imaging (TWRI), a time-delay and amplitude modified back projection (BP) algorithm is proposed. Therefraction point is found by Fermat’s principle in the presence of a wall, and the time-delay is correctlycompensated. On this basis, transmission loss of the electromagnetic wave, the absorption loss of therefraction wave, and the diffusion loss of the spherical wave are analyzed in detail. Amplitude compensation isdeduced and tested on a model with a single-layer wall. The simulating results by finite difference timedomain (FDTD) show that it is effective in increasing the scattering intensity of the targets behind the wall. Compensation for the diffusion loss in the spherical wave also plays a main role. Additionally, the two-layerwall model is simulated. Then, the calculating time and the imaging quality are compared between a singlelayerwall model and a two-layer wall model. The results illustrate the performance of the time-delay andamplitude-modified BP algorithm with multiple targets and multiple-layer walls of UWB TWRI.
Abstract
In order to solve the undetected probability of multiple targets in ultra-wideband (UWB) through-the-wallradar imaging (TWRI), a time-delay and amplitude modified back projection (BP) algorithm is proposed. Therefraction point is found by Fermat’s principle in the presence of a wall, and the time-delay is correctlycompensated. On this basis, transmission loss of the electromagnetic wave, the absorption loss of therefraction wave, and the diffusion loss of the spherical wave are analyzed in detail. Amplitude compensation isdeduced and tested on a model with a single-layer wall. The simulating results by finite difference timedomain (FDTD) show that it is effective in increasing the scattering intensity of the targets behind the wall. Compensation for the diffusion loss in the spherical wave also plays a main role. Additionally, the two-layerwall model is simulated. Then, the calculating time and the imaging quality are compared between a singlelayerwall model and a two-layer wall model. The results illustrate the performance of the time-delay andamplitude-modified BP algorithm with multiple targets and multiple-layer walls of UWB TWRI.
참고문헌 (14)
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