Multi-Object Feature Extraction in Resonance Region Based on Short-Time Matrix Pencil Method

As an intrinsic characteristic of the target, the pole characteristic of the resonant region is solely determined by the target itself and remains invariant with respect to external factors such as the incident direction and polarization of electromagnetic waves. Consequently, it serves as a critical foundation for target identification. The Matrix Pencil Method (MPM) is currently a widely adopted technique for extracting target poles; however, it typically processes single targets. When multiple targets produce time-domain echoes in the echo signal, the MPM fails to distinguish between individual targets, leading to extracted pole information that does not adequately represent the relevant characteristics of each target. In this paper, we propose a Short-Time Matrix Pencil Method (STMPM), which introduces sliding time windows to differentiate multiple targets in time-domain echoes. By analyzing the variations in poles across each sliding time window, the STMPM can accurately extract the poles corresponding to each target.