Robust Target Classification Using UWB Sensing^*

Abstract

Contactless material characterization has received widespread attention in the radar and engineering domains. Specifically, impulsive Ultra Wideband (UWB) systems are a versatile technology for the nondestructive characterization of samples because the scattered field produced by the targets is highly dependent on their composition and shape. After the initial transient response to the transmitted pulse, the scattered signal can be decomposed as a sum of complex exponentials, called complex natural resonances (CNR), which are dependent only on the geometry and composition of the target. Using this result, a classification problem was formulated to discriminate among targets, and a processing strategy was proposed to solve it. In particular, by using spectral decomposition tools, the information obtained from the physical model can be exploited in combination with data-driven learning techniques. Consequently, a classification strategy that is robust to modeling uncertainties and experimental perturbations was designed. To assess the performance of the new scheme, it was tested using both synthetic and experimental data obtained from targets illuminated with a UWB radar. The results showed substantial gains compared to classification using time-domain signals. INDEX TERMSComplex natural resonances, pattern classification, radar signal processing, spectral analysis.

Innovation of control technology for smart fuzes: precise detonation and efficient damage via a ternary cascade controller

“…Currently, the development of fuzes takes the development connotation of advanced fuzes as the main line, the whole-life safety and transient accurate initiation control as the theoretical basis, and the technical difficulties such as miniaturization, serialization, and environmental utilization as the safety mechanisms that need to break through. Environment and target detection need to overcome technical difficulties such as the mathematical representation of databases [5], feature classification, and rapid extraction of multivariate available factors [6]. Cross-linking and devices need to overcome technical difficulties such as transient information transmission modes of platforms and weapon fuzes [7], adaptive demodulation and antijamming, and anti-jamming device design in energy flow and information flow transmission.…”