Physically Accurate Differentiable Inverse Rendering for Radio Frequency Digital Twin

Collection of recent RF, wireless sensing, and signal-processing research highlighting advances that improve modeling, localization, and sensing fidelity—and which have dual-use security/privacy implications. Key contributions: RFDT (physically accurate differentiable RF simulator) enabling gradient-based reconstruction and optimization of RF scenes; KD-EKF for adaptive UWB/PDR fusion that improves indoor tracking robustness under NLOS; extensive channel characterization in H-band (250–330 GHz), and foliage/vegetation models and measurements at 60/80 GHz that refine high-frequency propagation/