G-CRLB Analysis for Target Localization in Through-the-wall Radar

For target location behind wall, the non-line-of-sight (NLOS) propagation caused by wall effect is the main factor that influences the localization performance. Based on the signal transmitting model, the NLOS is only determined by wall thickness and dielectric constant. In this paper, we use generalized Cramer-Rao lower bound (G-CRLB) as a basic tool to analyze target location performance. We deduced the G-CRLB of target localization behind wall. The Fisher information matrix (FIM) is divided into two parts: the observation matrix and prior information matrix, and the former corresponding to the measuring error, while the latter corresponding to wall parameter error. Simulation results evaluated the effect of wall parameters and measuring error on G-CRLB qualitatively.